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Comments 9201 to 9250:
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Eclectic at 09:04 AM on 30 October 2019Water vapor is the most powerful greenhouse gas
Even lower than 0.2mm
360Gt for 1mm sealevel rise? Call it close to 0.05mm/year.
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scaddenp at 06:29 AM on 30 October 2019Water vapor is the most powerful greenhouse gas
faerr - you seem to be missing the point that water vapour condenses out. No matter how much water you push up into the atmosphere by any means, the amount of water that the atmosphere will hold is dependent on the temperature. Once saturation is reached, then it just precipitates out. Burning FF does deplete O2 in atmosphere while making that water and I guess it makes an extremely tiny contribution to sealevel rise. (20Gt/y would be about 0.2mm)
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Philippe Chantreau at 05:11 AM on 30 October 2019Climate's changed before
TVC,
I'll add that I looked at both links in your comment above and can not understand the allusion to "government." One study from Oxford University was funded by the Gary Comer Abrupt Climate Change Fellowship, the other is from the Annals of the Brazilian Academy of Science. Unless you're from Brazil, it would suggest your interlocutor did not spend much time looking at the studies; it would be a pity because the full text is available for free on both of them.
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TVC15 at 03:58 AM on 30 October 2019Climate's changed before
Again many thanks to both MA Rodgers and Ecletic!
I am also out of my depths with respect to sea-level highstands but I knew that this denier was as well and I knew enough to know that neither of his links disproved anything I stated.
Without this site I would have to return to college and go an additional 2 years with intense focus on the science mythologies of climate change.
Thank you so much for broadening my scientific knowledge! :)
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trmpttiger3 at 03:16 AM on 30 October 2019Video: Dorian’s Deadly Stall – How Climate Change is Weaponizing Hurricanes
Last year after Hurricane Florence made her deadly stall on the coasts of the Carolinas, I sent an email to the National Hurricane Center asking them if it was time to revamp the Saffir-Simpson Scale since wind speeds are taking a backseat to rainfall and storm surges in the more recent hurricane impacts. They agreed and said that they were indeed working on such a system, but that it may take time for acceptance since the public is so used to the Saffir-Simpson scale. I think we would be better informed on the potential devastation for a hurricane if we knew the estimated rainfall and storm surge.
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One Planet Only Forever at 00:01 AM on 30 October 2019Skeptical Science New Research for Week #42, 2019
Dawei@3,
The following points may clarify my thoughts regarding "Are global tropical cyclones moving slower in a warming climate?", specific regarding it suporting a claim "...that AGW is likely *not* having an effect on cyclone speed":
- This document attempts to be a follow-up to a previous attempt to refute an evaluation of the full global satellite data set that strives to establish if, with the limited data currently gathered, there is evidence that the rate of movement of cyclones is reducing (they are moving slower), with the related result that the total amount of rain and wind damage from a cyclone event on a location could increase. The most likely cause of such a change of behaviour would be global warming.
- The previous critique of that report by this author resulted in modifications of the original report that did not change the conclusion of the report.
- This new critique appears to attempt a more detailed evaluation of regional 'sub-sets of the accumulated global satellite data'. If the global total data set is only marginally large enough to identify trends in, no sub-set should be expected to be large enough to note a trend. Yet the author seems to want to claim that their identification of 'regional speeding-up of movement after the eye makes landfall (my para-phrasing)' can be identified and is the basis for refuting the global evaluation.
- A lot of rain and wind damage can occur before the eye makes landfall. A recent major damaging storm swept up the coast of Florida without making landfall. And many others have done that. However, Dorian definitely 'sat on top of land for a long time', unlike cyclone movement after the eye finally makes landfall on a large land mass (the type of regional difference that the author seems to want to focus on - and it is possible that Dorian's behaviour above an 'island' would be excluded from the 'regional behaviour after landfall' that the author appears to want to write a story about).
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Eclectic at 20:21 PM on 29 October 2019Climate's changed before
TVC15 , if I may add a little to MA Rodger's Post #800 :
your denialist friend's 2nd scientific paper quoted, is dealing with a small coastal area at the southern tip of Brazil. The paper specifically says it has not allowed for "tectonic processes" that might modify the results.
When you add in a quantum of uncertainty of timings locally, and at the Vostok site also . . . then really he is making no useful comparison with changes in insolation at 65N [was your 651N a typo?] . . . nor any useful comparison with CO2 levels. And looking at temperature changes over the course of each MIS or interglacial period, you see that each cycle shows its own unique pattern of variations against the grand sweep of glaciation/deglaciation. From "minor" variations in insolation, ocean currents, vegetation changes, etcetera ~ and variation in sea-levels.
Your denialist friend has not shown any evidence to disprove the role of CO2 in connection with planetary surface temperature.
And he seems to have quite misunderstood the papers he quoted : indeed he is wasting the time of the readers.
And tell him, regarding sea-level highstands . . . he's out of his depth!
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Eclectic at 19:35 PM on 29 October 2019Water vapor is the most powerful greenhouse gas
Faerr @364 ,
it would be an interesting exercise if you made a quick back-of-envelope calculation to give a rough quantification of what you are proposing.
Use the burning of coal/oil at an annual rate of 10 Gigatons of carbon ~ each carbon atom would liberate about 2 atoms of hydrogen (and hence 1 molecule of water vapor. Thus (from atomic weights) . . . carbon 12 grams would produce 18 grams of water.
So, 10 Gigatons of carbon producing 15 Gigatons of water vapor annually (but probably a shade more, allowing for coal impurities and shorter-chain oily compounds). Let's round up to 20 Gigatons of water injected as vapor into the atmosphere, annually. You might have to subtract a bit from that (but how much?) to allow for coal/oil burnt in wintry & far northern regions, where you might expect much vapor to condense and "rain out" rather quickly. And the purer & dryer the coal, the less the water liberated.
But for simplicity, let's stay with 20 Gigatons water = 20 cubic kilometers of liquid water, annually.
I can't vouch for Wikipedia's accuracy, but Wiki says the world's annual precipitation is 505,000 cubic kilometers. In other words, so large that it seems completely justifiable for the scientists to choose to ignore the 20 cubic kilometers. ( I am without coffee, so please check with your own pen & envelope.)
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MA Rodger at 19:25 PM on 29 October 2019Climate's changed before
TVC15 @799,
It is a rather incoherent rant from your denialist. When you raise the point that only two of the last 8 interglacials were higher than today, he responds "No, it's every single one of them." Yet nothing he presents (his "science") is saying that all past interglacials had sea level above today. Indeed none are saying that global sea level was any different to your assertion (2 of 8 higher).
He presents two references.
Henderson et al (2006) is discussing the timing of the interglacial high stand in the Bahamas during MIS7 & MIS9 (note MIS9 is also one of the 2 past interglacials that were higher than today). They were certainly not considering the height of the peak sea level globally. Even if Henderson et al were discussing the height of the highstand, the isostatic movement of land means a local measure of relative sea level is not a reliable marker of global sea level. Nowhere do Henderson et al mention isostatic land movement. The height of the highstand is not their thesis, the timing is. (Note in the following reference Lopes et al, fig 6 shows the MIS1 holocene highstand 4 metres above present sea level. This would be down to local isostatic movement.)The denialist's second serving of "science" is Lopes et al (2014) is again primerally concerned with dating and having concluded that it is an MIS7 highstand they have identified, do not proclaim that MIS7 sea level has been underestimated (as the denialist concludes). Instead they look to find reason for their highstand being higher than they would have expected, their suggestion being that plate tectonics may be at work.
The denialist then sets out non-controversial CO2 levels from the Eemian. Quite how this links to his final grand "science says" assertion can only be speculated. Is he saying that if CO2 was below 300ppm in the Eemian with its higher sea level, then (sarcastically perhaps) with CO2 at 400ppm today sea level must rise? Strangely, this is the case. The warming resulting from increased CO2 will add perhaps 2.3m/degree C to global sea level, according to IPCC AR5.
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faerr at 14:06 PM on 29 October 2019Water vapor is the most powerful greenhouse gas
My first post, may it be interesting. I read these two posts concerning water vapor and GHG. My comment is that for the current level of 409 ppm, there must have been a much higher corresponding amount of water vapor emitted by burning fossil fuels (putatively how the CO2 is formed, eh?). Now there is a small exception of coal. However, since a given hydrocarbon has more Hydrogens than Carbon, the worst ratio being Methane 4:1 H:C and thus 2 molecules H2O to 1 molecule CO2 perhaps this will make up for coal then. So given the increase in water vapor, where is this considered? To me it seems that some scientists have oversimplified or missed or ignored it. It is far too easy to follow CO2, but not so easy to follow increased atmospheric water vapor until it enters the water cycle of ecosystem.
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TVC15 at 12:41 PM on 29 October 2019Climate's changed before
MA Rodger @788
OK so I shared the link showing that only two of the last 8 eight had sea level rise higher than today and this is what he came back with.
No, it's every single one of them.
Here's more science showing sea levels in MIS-7 and MIS 9:
The presence of a sea-level highstand at E180 ka represents a challenge to the idea that Pleistocene climate is driven by summer insolation at 651N. Sea-level is increasing (and therefore ice is melting) when 651N summer insolation is at one of its lowest points of the last 400 ka.
[emphasis his the denier]
Recognition of non-Milankovitch sea-level highstands at 185 and 343 thousand years ago from U–Th dating of Bahamas sediment
https://www.whoi.edu/cms/files/Hende...2006_21693.pdf
Here's another on MIS-7...from your own government....omigod...how can you debunk your own government?
Thermoluminescence (TL) and electron spin resonance (ESR) ages from sediments and fossil shells point to an age of ?220 ka for the end of this marine transgression, thus correlating it to MIS 7 (substage 7e). Altimetric data point to a maximum amplitude of about 10 meters above present-day mean sea-level, but tectonic processes may be involved.
https://www.ncbi.nlm.nih.gov/pubmed/25590701
Sucks to be you.....you can't scream, "Oil company funded research!"
The last interglacial (LIG; also known as the Eemian or MIS5e) lasted from 129 to 116 thousand years before present (ka).
If we look at EPICA Ice Core Data for CO2 levels in ppm, we find:
YBP ..... ppm CO2
116,501.... 262.5
117,750.... 267.6
118,649.... 273.7
119,672.....271.9
120,382.... 265.2
121,017.... 277.6
122,344.... 272.1
123,070.... 276.4
124,213.... 268.7
124,257.....266.6
124,789.... 266.3
125,081.... 279.7
125,262.... 273.0
125,434.....277.1
126,347.....273.7
126,598.....267.1
126,886.... 262.5
127,132.....262.6
127,622.... 275.3
127,907.... 275.6
128,344.... 274.0
128,372.....287.1
128,609.....286.8
128,866.....282.6
129,146.....264.1
129,340.....263.4
129,652.... 257.9
129,736.....259.0For a brief period, CO2 levels were in the 280s ppm CO2, but for the most part below that and the average is only 271.7 ppm CO2.
That, is Science, and Science says sea levels are going to rise and you can't stop it.
I've never stated that sea levels are not going to rise so him tossing that in at the end is a non sequitur.
I don't think that either link he posted is refering to sea-levels being higher than the two interglacials you mentioned in 784. (only two previous interglacials that saw such sea levels - the Eemian (MIS-5e) and 400,000y bp the MIS-11).
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Doug Bostrom at 06:49 AM on 29 October 201960 Years of Satellite Earth Radiation Budget Observations
Heh, this article was written in extreme haste when I realized we were about to ignore an important birthday. And the author is a mile wide and an inch deep, with shoals. :-0
Yes, moving the decimal to the correct position and using 2013 figures, our own power delivery is about 18TW.
Yup, wrong on total imbalance expressed as instantaneous power. Digging on this, I find I made exactly the same mistake as Greg Easterbrook, so at least I'm in superior company. Details of how to go wrong here: How much extra energy are we adding to the earth system?
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jabell at 06:02 AM on 29 October 201960 Years of Satellite Earth Radiation Budget Observations
It is definitely worth memorializing the beginning of observational (satellite) measurements of Earth’s Radiation Budget (ERB). A couple of caveats about the information in the explanatory background on the ERB (that have no effect on the overall message of the article) seem in order. The first has to do with the present energy imbalance. If we take this as 0.8 watts per square meter, then the total over the Earth’s surface (about 5 x 10^14 square meters) is about 400 terawatts, not “well over a thousand terawatts”. Second, the International Energy Agency has the total energy used by all human activities now nudging 20 terawatts, not 1.2 terawatts from “human manipulation of energy from all sources”. The comparison of 5% from human activity is negligible, but not as trivial as the article implies. It seems important, in communicating about climate science and climate change, to make sure these kinds of details are correct, so readers can be confident that the rest of the material is also trustworthy.
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Doug Bostrom at 03:39 AM on 29 October 2019A small electric plane demonstrates promise, obstacles of climate-friendly air travel
Further to Rob's remarks, as I read it the objective of hybrid aircraft is to employ batteries and electric assist to reduce fuel guzzling during take-off and a portion of ascent.
JATO: particulate emissions from aviation boost rockets as an elliptical geoengineering scheme? Hmm. Maybe we'd best remain silent on this. :-)
Leisurely aviation: go to ntrs.nasa.gov, plug in "dirigible" and "airship" as search terms, sort results in ascending order and one sees a picture of a world that did not happen, with airships occupying the top slot in commercial aviation. However it wasn't so much problems with lifting gas that truncated this path as issues with control of the vehicles in inclement weather, particularly during docking and while at dock.
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TVC15 at 03:14 AM on 29 October 2019Climate's changed before
Eclectic @796
MA Rodger @ 797
Thank you both so much! I learn so much everytime I come here and post the weird things that denialists state.
Thank you both so much!
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One Planet Only Forever at 01:52 AM on 29 October 2019Skeptical Science New Research for Week #42, 2019
Dawei@3,
Doug has provided a good reponse regarding the section the Report is listed under.
I will provide the following in an effort to respond to the other parts of your comment.
The abstract ends with the following: "The relationship between the slowdown of tropical cyclones and anthropogenic warming is therefore not apparent and the relevant potential increase in local rainfall totals in the future warming climate is suspicious."
That appears to be inconsistent with claiming "...that AGW is likely *not* having an effect on cyclone speed".
My comment was pointing out that, in addition to reading the complete abstarct, reading just a little further raises even more doubts about the claim "...that AGW is likely *not* having an effect on cyclone speed".
Along the lines of Doug's point regarding the category for the Report, claiming to doubt a conclusion of another report that has already been corrected without the corrections affecting the conclusions seems to indicate that serious skepticism should be applied regarding the claims this report appears to try to make. The author is not refuting the revised conclusion of the other report. They appear to be trying to tell a different story based on their personal interpretations of selective information.
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GwsB at 20:33 PM on 28 October 2019CO2 effect is saturated
Three weeks ago there was a congress in Amsterdam of Flat Earthers. I don’t believe the earth is flat. Neither do you. But what do you reply if your child asks “Why isn’t the earth flat?” Do you say “99.9% of the scientists say that the earth is a ball floating in space.” What if your daughter persists, and asks “But why is the earth a ball floating in space?”
I think I can give a sensible answer to that question. If I am asked whether reducing CO2 will have an influence on the climate I am not able to give convincing arguments why a reduction at the present level makes sense.
The Zhong&Haigh (2012) article is well written and convincing, but if one reads it a second and a third time one realizes that the paper contains no arguments. Figure 2 is on a scale which makes it impossible to see the effect of the shoulders and wings of the absorption around 665/cm. The vertical scale covers 12 orders of magnitude. There is no indication of the calculations performed to yield the plots in Figure 6.
Figure 3 suggests that between 750 and 1000/cm the IR radiative flux emitted at TOA follows the Stefan-Boltzmann curve for 280K and between 600 and 750/cm the S-B curve for 220K. This is a model-generated curve but quite close to the observed curve IRIS spectrum dd May 5 1970 over the Sahara at 12.00, see
https://disc.gsfc.nasa.gov/datasets/IRISN4RAD_001/summary
This observation was made almost fifty years ago. Where can one find more recent plots? A clear difference between 1970 and 2019 would be evidence that there is as yet no saturation.There is a nice explanation of molecular radiation and collisional lifetime (which distinguishes elastic and non-elastic collisions) at https://noconsensus.wordpress.com/2010/08/17/molecular-radiation-and-collisional-lifetime/
DJ Wilson and J Gea-Banacloche (2012) Simple model to estimate the contribution of atmospheric CO2 to the Earth's greenhouse effect (Am. J. Phys. 80, pp 306-315) presents good quantitative arguments for the greenhouse effect of CO2. Does anyone know of more recent literature, in particular on the topic of saturation?
If so that might help me convince my daughter that reduction of CO2 emission makes sense. -
MA Rodger at 20:08 PM on 28 October 2019Climate's changed before
TVC15 @795,
Your denialist runs through quite a complex argument, so probably well rehearsed but it is not very concerned with reality.
The talk of the decoupling of global temperature & CO2 is probably going back hundreds of millions of years. There is an SkS post on this here (& probably other too) but I would punt the ball back into the denialist's court and ask which era they are talking about. They probably have some ancient denialist graph showing CO2 & temperature less than strongly coupled but addressing specific eras is the way forward, not trying to debunk some bogus lines on a graph scribbled out years ago, (usually with temperature a parody of this Scotese graph).
The denialist presumably dismisses the tight coupling of CO2 through the last million years of ice ages with their "slight increase that follows a warming period". Then they plunge into the bold assertion that denies temperatures have been increasing over recent decades. If they require it to be "verified" they obviously haven't understood how thermometers work, how calendars work (winters and shorter, summers longer under AGW) and a whole ot more. This is village idiot talk.
Their final run is in arguing for there being other causes for the temperature increase which is exceptional over thousands of years but that they deny exists. It would probably be better responding that the cause of such an exceptional global temperature change requires a cause, not just a list of mechanisms that impact the climate system. So if they want to invoke rain or humidity or clouds, what has set these off to cause this exceptional warming now?
One of those they point to as a potential cause is, of course, manmade. CFCs & HCFCs would have been as bad as CO2 at forcing AGW if they hadn't been banned. There is also albedo which could be forced by land-use change as well as cloud (& there are denialists that have argued this as the cause of warming, although measured albedo shows nothing to support such an assertion).
Their final talk of "questions that ought to be asked" could be another approach to a reply - what questions? Be specific!!
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Eclectic at 19:02 PM on 28 October 2019Climate's changed before
TVC15 @795 ,
I am assuming that you are dealing with a single denialist who tries to bury you under a blathering gush of Gish Gallop.
IMO, best to challenge him on just a few points of his gush :-
(A) Planetary surface temperatures show a good correlation with the *combined* effects of changes in solar output and variations in atmospheric CO2 level. Examples: look at the cooler/warmer periods of the Ordovician Age and also the Carboniferous Age, as well as the Cenozoic recently. Sometimes the CO2 rise was caused by the temperature rise, and sometimes (such as the last 150 years) the CO2 rise preceded & caused the temperature rise.
[to him] "Question: Why are you apparently unaware of all that paleo evidence?"
(B) We know the surface temperature is rising, because [i] satellite evidence shows land and sea ice is melting, and [ii] satellite and tide-gauge evidence shows rising sea level, and [iii] thermometers confirm the rising temperature (a rise now of almost 1 degree since reliable general measurements commenced).
[to him] 'If you cannot understand such basic science, then your "can't feel it" opinion is worth nothing.'
(C) The scientists have looked into all sorts of factors that might influence climate (ranging from clouds and cosmic rays, to greenhouse gasses and albedo changes).
[to him] "If you yourself have discovered a vitally important factor they overlooked, then [i] tell us what it is, and [ii] write to the National Academy of Sciences, and explain to them what morons they all have been for missing such a basic factor, and (iii) start planning how to spend all the Nobel Prize money that you will be awarded from the astounded and delighted Nobel Committee ! .....And good luck with that, Mr Unappreciated Genius."
(Doubtless he will start shifting goalposts, and/or go into strawman arguments, and/or go into Conspiracy Mode.)
.
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Doug Bostrom at 15:21 PM on 28 October 2019Skeptical Science New Research for Week #42, 2019
In the abstract of the paper Dawei mentions, we read this:
A recent astounding study reported a 10% slowdown in global tropical-cyclone translation speed over the past 68 years (1949–2016) and implicitly related this to the weakening of tropical circulation forced by the anthropogenic warming. It thereby suggested that it might result in more local rainfall totals in a warming climate. However, here this study shows that no robust and significant observational and modeling evidences reveal that they are.
The paper goes on to discuss the author Chan's reasons for disagreement with the paper he cites. Both papers are discussing effects of global warming, Chan in a slightly more histrionic but otherwise standard format. Finding a negative result does not vanish the topic, so to speak.
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Dawei at 13:37 PM on 28 October 2019Skeptical Science New Research for Week #42, 2019
One Planet, I'm not sure what point you are trying to make. The paper is clearly intended as a counter to the claims of cyclone slowing. The authors argue there's no evidence for it, so this paper shouldn't be listed in a group called "Observation of global warming and global warming effects" (its whole purpose is to argue that the case for this being one of its effects is weak to non-existent).
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TVC15 at 12:56 PM on 28 October 2019Climate's changed before
Here's some more climate change denier blather I came across today.
When you are using a complicated explanation to detail why something is happening, or is believed to be happening, you have almost certainly overlooked a much simpler reason for it.
In the case of CO2, we already know from the fossil record that levels have been much higher in the past and also lower.
During periods of low atmospheric CO2 levels, surface temperatures have been significantly higher.
Likewise, during periods of very high CO2, temperatures were cooler than we are experiencing today.
In fact, the only consistent relationship between CO2 and surface temperature seems to be the slight increase that follows a warming period as the oceans release stored CO2.
So, when doubling the atmospheric CO2 level results in a claimed surface temperature change that is essentially imperceptible to the senses, the question becomes, how do we know the temperature has actually increased.
Assuming an increase in surface temperature can be verified (good luck with that), the next question is, is it really caused by elevated CO2 levels and to what degree?
What other factors are in play and, most importantly, what other factors cannot be measured and their influence accounted for?
On the issue of cloud cover, NASA essentially punts.
They admit that past cloud cover was never measured in any meaningful way and that measuring cloud cover, even with the technology available today, is more or less a scientific fool's errant.
Of course, the problem is that we can't account for the effect of CO2 unless we also account for the effect of cloud cover, then and now.
I could go into refrigerants in the stratosphere, the albedo effect, rain and humidity and other factors that are clearly ignored by the settled science crowd, but why bother.
CAGW is a religion dressed up as a pseudo science trying to pass itself off as legitimate science.
The reason questions that ought to be asked are not asked is because we would have to admit that the data is insufficient, unavailable and probably unknowable.
There are so much illogical claims here I don't know where to start!
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One Planet Only Forever at 11:34 AM on 28 October 2019Skeptical Science New Research for Week #42, 2019
Not far below the abstract the following is stated. Note the use of "may" regarding claims that are implied to support the suggestions of this paper.
"Recently, Kossin (2018a) reported that the global tropical-cyclone translation speed over the 68 year period 1949–2016 was slowing down by 10% and implicitly related this to the weakening of the tropical circulation forced by the anthropogenic warming (Held and Soden 2006, Vecchi et al 2006, Vecchi and Soden 2007, Coumou et al 2015, He and Soden 2015, Grise and Polvani 2017, Mann et al 2017). He thereby suggested that it might result in more local rainfall totals in the warming climate, particularly over land. Such findings and implications have been widely interpreted, broadcasted and forwarded by various social media and sectors since then (Guglielmi 2018, Patricola 2018, Shultz et al 2018). Unfortunately, his study was imprecise and questioned. The early work of the present study pointed out two deficits in his calculation of tropical-cyclone translation speed and an author correction had been made after (Kossin 2018b). Although the correction shows no material impact on the key conclusions of the original study on a global scale, it has a number of varying effects on regional scales. Such varying effects are more apparent for tropical cyclones over land. On top of that, this study further suggests that the slowdown of global tropical-cyclone translation speed stated by Kossin (2018a) may not be a real climate signal or it may be exaggerated, which is consistent with what Moon et al (2019) and Lanzante (2019) commented coincidentally."
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Dawei at 08:40 AM on 28 October 2019Skeptical Science New Research for Week #42, 2019
The abstract of "Are global tropical cyclones moving slower in a warming climate?" concludes that AGW is likely *not* having an effect on cyclone speed. (Betteridge's law should have been a clue).
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MA Rodger at 19:56 PM on 27 October 2019Video: Dorian’s Deadly Stall – How Climate Change is Weaponizing Hurricanes
The difficulty with arguing about tropical cyclones with trolls is two-fold. Firstly global-wide records only stretch back to 1970 meaning that the increase in ACE 1970-on, a NH phenomenon (see bottom graph in link @6) which is a statistically significant decadal rise of 5%(+/-2% - 2sd), is too short given the wobbles evident in the one long record we do have (the N Atlantic).
Secondlly, where records are of a useful length (ie the North Atlantic graphed above), their reliability of the data back in the day of sailing ships and quill pens puts the trend (with its narrower statistical significance) into doubt.
Mind, I see one poorly discussed phenomenon that demonstrates we probably are stoking up a whole heap of trouble with future tropical cyclones. The 2017 North Atlantic season started very very quietly. Then from late August through to October, it went crazy, smashing all records for ACE over that period. Eight storms, all hurricanes, six of them major.
And it looks like we were not far off a repeat in 2019. Again a very quiet start then come the end of August the storms start ramping up. ACE for September was well short of 2017 but otherwise head-&-shoulders above recent years. Unlike 2017, only four of the nine storms wound up into hurricanes but three of those managed to reach major categories.
As it is with rain data, tropical cyclone activity is very lumpy which makes identifying trends very difficult - very difficult but not impossible. And, paraphrasing the troll @2 (although snipped) "wishing it weren't so doesn't have much effect!"
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agno at 19:11 PM on 27 October 2019Using fallacy cartoons in a quiz
I know this post is a bit old now, and I hate to split hairs, but, I think that you have misunderstood some of John's material.
As much as I love the idea of this toolkit, and am grateful to you for making it available, (I thought about using it at a Transition Town Meeting), I think it needs some small corrections.
Logical Fallacies are a subset of Science Denial Techniques. You have listed all of the Science Denial Techniques as a "Taxonomy of Logical Fallacies", not just the Logical Fallacies.
Fake Experts, Fake Debate, Impossible Expectations, Moving the Goalposts, Cherry Picking and Slothful Induction, are not Logical Fallacies.
Thank you again.
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Daniel Bailey at 09:32 AM on 27 October 2019Video: Dorian’s Deadly Stall – How Climate Change is Weaponizing Hurricanes
Current 2019 global ACE is 111% of normal YTD values.
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One Planet Only Forever at 08:17 AM on 27 October 2019Video: Dorian’s Deadly Stall – How Climate Change is Weaponizing Hurricanes
Claims like the one made by SteveW, that all is well because "Accumulated Cyclonic Energy (ACE) is not increasing", always seem to have to dismiss the bigger picture.
Selective points can be turned into any claim, as long as many related counter-points can be ignored. (As a tongue-in-cheek example, I know a Steve who is very resistant to learning new things, especially if the new learning would require him to give up something he developed a liking for benefiting from, so I expect other Steves to be inclined to be like that. Maybe this Steve will prove me to be wrong about that).
In addition to nigelj's point about the expected increase of category 4 and 5 events (presented in a 2013 paper analyzing satelite data from 1975 to 2010, and not evaluating ACE), I would add that there also appear to be recent cyclones with sustained wind speeds so high that a Category 6 should be added.
Back to ACE, by reviewing a few sites I have found that many evaluations are limited in scope. They are not complete global evaluations.
The evaluations 'lacking a clear increased signal' are likely regarding the most commonly reported Atlantic Hurricane events (they exclude Typhoons). I did, however, come across a Wikipedia presentation regarding Accumulated cyclone energy that includes a presentation of Atlantic basin hurricane season values from 1851 to 2019 showing that a significant number of Hyperactive and Above Normal years have occurred since 1995. That appears to contradict a claim about a lack of increase, even in that limited scope of the globe (unless the claim is that there is no clear evidence of an increase within that most recent 20 year set of clearly higher values - which needs a two-faced way of looking at things, or a desire for a myopic view).
In addition to that point, a discussion of Hurricanes is not the full story. All cyclonic activity matters, not just the potential to affect USA territory. There are also Typhoons and, in addition, they seem to be increasingly damaging (irrespective of whether there is a measured increase of ACE).
And the even bigger story is that, in addition to 'longer lingering hurricanes producing more damage', more intense and damaging Tropical Storm level events (sustained winds below hurricane levels), also appear to be occurring.
Maybe SteveW would care to prove that my generalization about all Steves is wrong by providing a comprehensive and verifiable evaluation of what is really going on regarding all aspects of cyclonic events, the Big Picture (or will SteveW prove to be resistant to learning new things, especially if the new learning would require him to give up something he developed a liking for benefiting from).
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nigelj at 06:15 AM on 27 October 2019Video: Dorian’s Deadly Stall – How Climate Change is Weaponizing Hurricanes
Steve W it must be very inconvenient for you that the data shows the numbers of category 4 and 5 hurricanes are increasing as in the link I posted. These are the ones that cause by far the most damage. It's trivially obvious that global warming pushes more energy into the earths system so this must by definition effect all weather systems, so its a question of how, and it doesn't necessarily mean you get a simplistic response like more global cyclonic energy, because weather systems are complicated.
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Eclectic at 04:50 AM on 27 October 2019Talking about climate science at SAP TechEd in Barcelona
Congratulations, BaerbelW , on the spur-of-the-moment mini meeting!
The meeting looks much more Spartan and much more cheerful than the sour-and-dour expressions photographed at the recent long-planned & lavish assembly of "old white men" (in embarrassingly small numbers!) at one of the faux-grand Trump buildings in the USA, for climate-denialist propaganda purposes!
I was intrigued to hear about the "throw-away" carpet idea getting banned. Naively, I had thought that there was no such thing as single-use carpeting.
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Tom Dayton at 01:54 AM on 27 October 2019Video: Dorian’s Deadly Stall – How Climate Change is Weaponizing Hurricanes
SteveW: I don't think total accumulated cyclonic energy would be increased by stalling patterns of hurricanes. I don't think there is anything close to a consensus that total accumulated cyclonic energy will be increased by global warming. Instead, the weak consensus among climatologists is that the number of hurricanes will be unchanged or might even decrease, while the number of very strongest hurricanes will increase.
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SteveW at 00:42 AM on 27 October 2019Video: Dorian’s Deadly Stall – How Climate Change is Weaponizing Hurricanes
Must be very inconvenient for you that Total Accumulated Cyclonic Energy worldwide shows no change throughout all the climate change hysteria of the last decades. Guess wishing it were so doesn't have much effect!
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Inflammatory tone and language snipped.
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Postkey at 17:01 PM on 26 October 2019Tipping Points: Could the climate collapse?
“The IPCC report that the Paris agreement based its projections on considered over 1,000 possible scenarios. Of those, only 116 (about 10%) limited warming below 2C. Of those, only 6 kept global warming below 2C without using negative emissions. So roughly 1% of the IPCC’s projected scenarios kept warming below 2C without using negative emissions technology like BECCS. And Kevin Anderson, former head of the Tyndall Centre for Climate Change Research, has pointed out that those 6 lone scenarios showed global carbon emissions peaking in 2010. Which obviously hasn’t happened.
So from the IPCC’s own report in 2014, we basically have a 1% chance of staying below 2C global warming if we now invent time travel and go back to 2010 to peak our global emissions. And again, you have to stop all growth and go into decline to do that. And long term feedbacks the IPCC largely blows off were ongoing back then too.”www.facebook.com/wxclimonews/posts/455366638536345
Will there be 'change'?
“Today’s global consumption of fossil fuels now stands at roughly five times what it was in the 1950s, and one-and-half times that of the 1980s when the science of global warming had already been confirmed and accepted by governments with the implication that there was an urgent need to act. Tomes of scientific studies have been logged in the last several decades documenting the deteriorating biospheric health, yet nothing substantive has been done to curtail it. More CO2 has been emitted since the inception of the UN Climate Change Convention in 1992 than in all of human history. CO2 emissions are 55% higher today than in 1990. Despite 20 international conferences on fossil fuel use reduction and an international treaty that entered into force in 1994, manmade greenhouse gases have risen inexorably.”
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Jesse Baker at 13:47 PM on 26 October 2019Tipping Points: Could the climate collapse?
Nigel J, #17: “So yes mitigating climate change to get to net zero emissions by 2050 will be challenging and will require some lifestyle changes, but not nearly as much as the war effort, even if the 3% figure is too optimistic.”
My example’s extreme, of course; yet I’m old-fashioned. To me, reducing emissions means for the most part not burning the stuff, with CO2 sequestration as an adjunct, and I’ve hoped the US would adopt an energy policy ever since the OPEC embargo brought Nixon’s “Double Nickel” speed limit. At least the absolute growth of fossil fuel consumption has stopped again, as happened during a few 1980s years when we had advances in efficiency.
I take it the 3% represents a shift from consumption to investment in the new sectors, geothermal, wind, hydro and solar we’d be developing. It would create jobs, but lead to more expensive goods. Any laws we adopt on energy must have broad public support to include, grudging or not, that of conservatives and those in the oil business; else they won’t last through our government’s regular changes of party control. Once law, it’ll have to be enforced through EPA rules or heavy Pigovian taxes. This is what makes me feel it a difficult problem.
Doug, #18: “…in terms of Long Now thinking, the faster we work now, the better the long result.”
Another reason I wish we’d taken energy issues seriously when the first bubbles popped. I’m agnostic on the particulars of climate change itself. Models are attempting to separate out a small effect in a complex, dynamic Earth and the numeric forecast ranges shown on graphs today haven’t changed a great deal from those I saw in the ‘80s or ‘90s. Yet adding CO2 to the air—and a full quarter of all this gas is manmade, emitted after my birth—encourages temperature hikes which will continue, due to thermal inertia, for a long time even if the cause is removed. It takes just a Kelvin or so before trouble starts.
Running such an “experiment” on the only planet we have is foolish. Uncertainty isn’t a license for recklessness. I don’t see why Americans cannot arrive at agreement on the need for curbs.
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nigelj at 17:25 PM on 25 October 2019A small electric plane demonstrates promise, obstacles of climate-friendly air travel
Wait a minute. Both hydrogen fuel cells and hydrogen powered rockets produce water vapour which is a greenhouse gas. This would put water vapour reasonably high up in the atmosphere. I assume this has been evaluated hasn't it? But has it?
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nigelj at 11:30 AM on 25 October 2019Video: Dorian’s Deadly Stall – How Climate Change is Weaponizing Hurricanes
link.springer.com/article/10.1007/s00382-013-1713-0
"We find no anthropogenic signal in annual global tropical cyclone or hurricane frequencies. But a strong signal is found in proportions of both weaker and stronger hurricanes: the proportion of Category 4 and 5 hurricanes has increased at a rate of ~25–30 % per °C of global warming after accounting for analysis and observing system changes. This has been balanced by a similar decrease in Category 1 and 2 hurricane proportions, leading to development of a distinctly bimodal intensity distribution, with the secondary maximum at Category 4 hurricanes. This global signal is reproduced in all ocean basins."
So increasing frequency of category 4 and 5 hurricanes, with stalling patterns and higher levels of rainfall. A potent mix.
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michael sweet at 07:31 AM on 25 October 2019Skeptical Science New Research for Week #41, 2019
Mark Pitts,
So the burden of proof lies with those who want to save money by building the cheaper systems. It seems to me like a no brained decision to build cheaper renewable energy and not expensive polluting fossil fuels.
Why are you against cheaper energy?
Moderator Response:[DB] That user has opted to recuse himself from further discussions here, finding the burden of compliance with this venue's Comments Policy too onerous.
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Rob Honeycutt at 05:37 AM on 25 October 2019A small electric plane demonstrates promise, obstacles of climate-friendly air travel
I keep thinking there should be an attempt to create a rocket assist system to enable electric aircraft to achieve greater range. Rockets can efficiently use oxygen/hydrogen mix without producing carbon emissions.
The initial climb to cruising altitude is the phase of flight that requires the most energy. If you could build a carrier system similar to what Scaled Composites used to put their small manned craft into space, perhaps that—as a rocket propelled carrier—could carry an electric aircraft up to a high cruise altitute from which to initiate the flight. The carrier craft would then fly back to the airport to refueled for the next flight.
My other recent thoughts on the future of electric aviation is that, perhaps people need to get used to slower, more relaxing flights for long trips. If you could create an electric aircraft design that could make a transoceanic flight with an assist to cruise, slower flights might be what make that feasible. The economics of electric flight hold such a large advantage that it may be cost effective to give customers business-class style cabins and expect normal 12 hr flights to last 20 hrs instead. The additional 8 hrs could be very tolerable in a comfortable setting.
Additional note: electric motors offer some clear advantages over fuel-based engines since both ICE and turnbines require air for combustion. At higher altitudes a great deal of additional energy is used to accelerate air into a chamber for combustion. There are efficiency losses for electric motors as well, but I believe it's limited to accelerating air for propulsion rather than propulsion and combustion.
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One Planet Only Forever at 00:54 AM on 25 October 2019A small electric plane demonstrates promise, obstacles of climate-friendly air travel
nigelj@24,
Free Market activity fundamentally develops powerful resistance to any attempt to limit activity in the competitions for Status, especially when the limitations would reduce some developed perceptions of status relative to others (winners do not like changes that reduce their winning - even if they understandably deserve to lose status - even if the changes will only make them less obvious winners).
However, limitations imposed to achieve and improve on safety levels are 'adapted to' after attempts to block them from being developed and implemented fail (though some people still try to claim that not wearing a seat-belt and being in a car without airbag systems is 'Safer' - which only proves that what people believe cannot be allowed to govern what limitations are imposed).
The same can be seen to be the case for limitations to achieve and improve on the constantly improving understanding of the Sustainable Development Goals (social and environmental safety). The Free Market can adapt to SDG limitations. But its participants can be expected to powerfully resist the development and implementation of such limitations.
Air Travel regulations to correct what has developed probably need to be implemented with the understanding that the developed magnitude of the activity needs to be reduced. That reduction of a portion of the economy will be powerfully resisted no matter how harmful and unnecessary the developed activity is actually understood to be. A similar resistance to correction can be seen in places like Alberta where the development since the need to reduce global fossil fuel was solidly established has been attempts to increase the rate of benefiting from the export of fossil fuel resources (the USA also did it, as well as Australia).
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David Kirtley at 00:34 AM on 25 October 2019Skeptical Science New Research for Week #41, 2019
Here is a timely piece from Oreskes and Stern on the intersection of climate science and economics: Climate Change Will Cost Us Even More Than We Think.
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Nick Palmer at 22:22 PM on 24 October 2019Canada's ClimateData Web Portal: Normal Science, Not Fake
BTW, I'm a bit worried that John Cook et al's newest report will give plenty of ammunition to the smarter denialists/propagandists out there...
America Misled - How the Fossil Fuel Industry Deliberately Misled Americans About Climate Change -
Nick Palmer at 21:39 PM on 24 October 2019Canada's ClimateData Web Portal: Normal Science, Not Fake
Hank@26
Campaign groups and high prominence individuals routinely conflate climate change with the possible '6th mass extinction', that may be happening, to imply to their followers, by throwing around sciency sounding words like methane, tipping points and permafrost, that near term human extinction is likely unless we do what they demand. -
nigelj at 09:03 AM on 24 October 2019A small electric plane demonstrates promise, obstacles of climate-friendly air travel
Hydrogen fuel cells for aircraft would face safety challenges. Even if these were overcome the public might still feel insecure and not supportive. It's like the public fear of nuclear power, which may be excessive, but is very real and has killed the nuclear industry dead in some places.
However I think some combination of biofuels, electric aircraft where possible, less flying and carbon offsets would certainly work. The combination would get us to net zero. Biofuels blends up to 50% are acceptable, leaving the balance to be achieved by less flying, carbon offsets, etc which looks realistic although it looks like it would commit a very large part of new forests to these offsets.
The challenge is this is a lot of different components to get into in place and coordinate, especially in a free market democracy. China could do this by dictate, but this is not possible in a free market democracy. So would it make sense for western countries to go on a war footing and give government's sweeping powers? I would not be loving this, and it seems unlikely. But who knows....
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Doug Bostrom at 07:35 AM on 24 October 2019Skeptical Science New Research for Week #41, 2019
The impossible expectation that expert resources must reach a supernatural level of omniscience seems like a variation of a familiar route to misunderstanding, covered here.
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Doug Bostrom at 07:19 AM on 24 October 2019A small electric plane demonstrates promise, obstacles of climate-friendly air travel
Yeah liquid hydrogen might work. I don't think we'll be able to engineer pressurized storage on the scale/weight points needed (monolithic containers are too heavy, fatigue cycle life of composite containers is quite poor and we're speaking of tens of thousands of cycles).
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Philippe Chantreau at 06:04 AM on 24 October 2019A small electric plane demonstrates promise, obstacles of climate-friendly air travel
Good points from contributors. There can be progress nonetheless
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nigelj at 05:52 AM on 24 October 2019Skeptical Science New Research for Week #41, 2019
markpittsusa @25, your analogy doesn't make too much sense because a study on the physical sciences would never or rarely require an economist. The NCA and similar reports consider not just the science but also the impacts risks and adaption to climate change. Can we agree this is a very wide ranging issue? As such you need a huge pool of information beyond what one person could do. The physical impacts are vast and encompass nearly every scientific discipline so not just atmospheric physics, but geology, biology, water conservation, crop production and literally dozens of other issues.
But quantifying the economic impacts of all this only needs a few economists. Much of their work is computerised. For this reason the team of people producing the NCA report is likely to be mainly various science and technology experts, and just a few economists. So the balance of people looks fine to me.
You have considerable pateience to track down peoples qualifications and it's not a bad sceptical exercise to go through, but I don't see that you have uncovered any problem, because theres clearly significant economic expertise involved. Just scanning the bibliography in the NCA reports and numerous economics research foundations are mentioned, and clearly they must employ plenty of economists.
But you have to apply a commonsense filter to scepticism. Very few climate scientists are going to do pure economic modelling and calculations. I know a little bit about economics, have read a couple of text books, and this is complex material and climate scientists don't know this stuff and why on earth would they try when they can simply get a couple of economists involved? If a climate expert did economic modelling and it turned out to be a mess which is quite likely, they would probably get caught out in peer review or by various sceptics and it would be painful, so climate scientists are not stupid, they delegate the economic calculations to economists or similar people. Climate scientists want to do climate science. There may be some exceptions but not that many.
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markpittsusa at 05:25 AM on 24 October 2019Skeptical Science New Research for Week #41, 2019
“What’s wrong with climate scientists publishing in economics?” In my view such publications, per se, are not a problem.But you need only turn the NCA situation around to see why the selection of authors brings the report into doubt. Consider the following:
Suppose, for example, that a government somewhere commissioned a major report on climate change which was primarily written by traditional economists, with only about 15% participation by traditional physical climate scientists.
Now of course those economists would have taken 1 or 2 courses in climate science as part of their curriculum.
Perhaps those economists had even published papers on climate science, but their publications were all in economics journals, not climate science journals.
And assume further that the report’s findings were generally at variance with most climate scientists (including a recent Nobel Prize winning climate scientist.)
If all this were to happen, climate scientists would (correctly) cry “Foul !”
But what I’ve described is nearly the exact mirror image of the NCA report.
Moderator Response:[DB] Sloganeering snipped.
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Doug Bostrom at 04:27 AM on 24 October 2019Tipping Points: Could the climate collapse?
Thinking of the "Long Now" it's pretty clear that almost (?) everything we need to accomplish for mitigation of climate change is necessary work in any case, even if CO2 were not a factor.
And again in terms of Long Now thinking, the faster we work now, the better the long result.
Unfortunately I'm not sure I'm being cynical in agreeing w/Jesse that our nature as a species is to ignore problems until opening the front door of one's home reveals flames, waves lapping at the stoop, hungry people from somewhere else too blasted for further existence to be possible. This myopia seems part and parcel of our tendency to behave as though the world ends the day we die.
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One Planet Only Forever at 04:03 AM on 24 October 2019A small electric plane demonstrates promise, obstacles of climate-friendly air travel
doug_bostrom@20,
Hydrogen fuel cells may be a practical option for air travel. Time will tell.
I agree with seriously considering the reasons for taking a flight until a decent way to fly is developed. I am not a believer in buying off-set credits to justify an 'optional' flight.
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