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Comments 24251 to 24300:
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scaddenp at 13:51 PM on 19 May 2016It's cooling
Someone believing what they read on Tony "CO2 could fall as snow in Antarctica" Heller's blog has their critical faculties turned off completely.
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JIm Steele at 10:58 AM on 19 May 2016Corals are resilient to bleaching
Coral Bleaching is the Legacy of a Marvelous Adaptation Mechanism
http://landscapesandcycles.net/coral-bleaching-debate.html
Observations of increased bleaching have happened for both warm and cold events
Moderator Response:[Rob P] - Note the text on the post you have commented on:
"Because reef-coral have adapted tolerance to a narrow band of environmental conditions, bleaching can occur for a number of reasons, such as ocean acidification, pollution, excess nutrients from run-off, high UV radiation levels, exposure at extremely low tides and cooling or warming of the waters in which the coral reside. Typically these events are very localized in scale and if bleaching is mild, the coral can survive long enough to re-acquire new algal partners. So bleaching in itself is not something new, but mass coral bleaching on the huge scale being observed certainly appears to be, and represents a whole new level of coral reef decline."
Coral reefs globally are in dramatic decline and the worldwide bleaching event currently underway is likely to kill quite a few more coral reefs. When one steps back to look at the 'big picture' it's pretty clear why coral reefs in the ancient ocean suffered crises and extinctions - a too-warm and acidified ocean was just too inhospitable for them to survive. -
Bob Loblaw at 10:51 AM on 19 May 2016The things people ask about the scientific consensus on climate change
billev:
Your "fact" that temperature rise has not been continuous even though CO2 rise has been "constant" would only be a reasonable conclusion if CO2 was the only thing that affected global temperatures. It is not, and there are lots of posts on this site that will educate you if you bother to look. Although many factors affect short-term trends (and some longer-term), the current rise in temperatures cannot be explained by those other factors and it is entirely consistent with the known physics of CO2 and radiation transfer.
Your logic is like saying that your long-term increase in your bank balance is not caused by your regular paycheck because the bank balance drops sometimes (when you pay bills) - even though you have no other source of income.
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pattimer at 03:03 AM on 19 May 2016What Sir David King gets wrong about carbon pricing
I am 100% in favour of a carbon tax to take into account, as far as possible, external costs but when David King says "“It needs to go hand in hand with other regulatory systems.” I cannot find fault with that opinion either. We neeed surely to use every tool at our disposal, carbon tax, government planning and regulation. If on the other hand he argues that regulation should be used instead of carbon tax I would say he was in error for excluding an important strategy.
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billev at 02:31 AM on 19 May 2016The things people ask about the scientific consensus on climate change
The referenced papers, in my opinion, do not prove that the increase in radiative forcing has been sufficient to have any measureable effect on temperature change as recorded since 1880. The fact that atmospheric CO2 rise has been constant but temperature rise has not been continuous does not support a finding that CO2 levels are influencing temperature.
Moderator Response:[PS] These papers show that energy radiating to earth surface increase precisely in line with predictions. Unless you want to revoke Plancks Law and conservation of energy, this must increase temperature. To discuss correlation with temperature, please see the myth "There is correlation with temperature". Please note that nowhere does science claim a linear correlation with temperature - CO2 is not the only factor in surface temperature, especially on scales less than a couple of decade. This site is not the place for rhetorical tricks like strawman arguments.
You might find the "Arguments" item on the top menu bar helpful for finding resources about your apparent beliefs. Please read the article carefully before commenting and if you want to dispute the science, please ensure that you have understood what the science claims first, not taking some misinformation site's word for it.
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mitch at 01:29 AM on 19 May 2016Ocean Oxygen – another climate shoe dropping
Very nice presentation.One of the best summaries I have seen.
Important point to make is that the expanded anoxic zone is a transient, because the ocean is heated from the top but mixed by winds and tides. The density gradient across the thermocline strengthens as global temperatures go up, making it more difficult to mix water and oxygen down.
Eventually as the ocean warms and the gradient drops, there will be more exchange. However, warm temperatures still cause organic matter degradation shallow and maintain higher atmospheric CO2.
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Tom Dayton at 01:04 AM on 19 May 2016Models are unreliable
dvaytw, more details on how the Bates paper is ridiculous are at ATTP.
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Joel_Huberman at 00:19 AM on 19 May 2016What Sir David King gets wrong about carbon pricing
Nick @ 3. I'm a member of a Citizen's Climate Lobby chapter in New Hampshire. Our chapter is just a year old, but already it's lobbying effectively at the Federal legislative level (Senate and House). Citizen's Climate Lobby has posted a great deal of information about its proposed "carbon fee & dividend" policy here: http://citizensclimatelobby.org/carbon-fee-and-dividend/
In addition, the Carbon Tax Center posts lots of information about carbon taxes in general, with and without dividends, on its website.
Finally, I fully agree with sauerj@1 that Dr. Shi-Ling Hsu's book, "The Case for a Carbon Tax," is an excellent source of information. In addition, it's brief, well written, and occasionally humorous. Look it up on Amazon.
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MA Rodger at 23:50 PM on 18 May 2016It's cooling
sam @268,
If you wish to set out an argument that "you can't say there is global warming when the ice is increasing," it would be advisable not to link to a NASA press release which demonstrates that you actually can say it -
“At the end of the last Ice Age, the air became warmer and carried more moisture across the continent, doubling the amount of snow dropped on the ice sheet,” Zwally said. The extra snowfall that began 10,000 years ago has been slowly accumulating on the ice sheet... (My bold)
Of course, some may question the authority of Jay Zwally to make such a statement, but he is the lead author of the work in question and was also clever enough to predict even before its publication that silly denialists will distort his work for their own ends.
“I know some of the climate deniers will jump on this, and say this means we don’t have to worry as much as some people have been making out,” he says. “It should not take away from the concern about climate warming.”
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Eclectic at 23:41 PM on 18 May 2016It's cooling
Sam, I am happy to give you a detailed reply to your latest posting, which has been "half struck out".
In collecting anecdotal evidence and a scattering of selected events, it is all too easy for the human brain to be influenced by unintended bias and subconscious prejudices. That is why a careful and thorough scientific evaluation is the only way we can come to realistic conclusions on a complex and worldwide phenomenon such as climate measured over time.
The most straightforward approach here, is to look for an aggregator which compiles all the net effect of the cold & hot events you are interested in. Such an aggregator is the "global mean sea level" over time. ( You can find recent graphs of Global MSL via the University of Colorado website. )
3 or 4 mm per year may not seem very much when you are standing on the beach on a particular day - but think about what it means over the oceans of the whole planet. Each 1 mm of rise represents the melting of approx. 360 Giga-tons of ice, coming from the ice-sheets of Antarctica, Greenland, and so on (and even from the sadly-depleted Glacier National Park ! ).
360 cubic Km of ice is a colossal amount - try a mental picture of 360 blocks of ice measuring each 3,300 feet tall and wide and long. And don't forget that part of each year's rise in MSL on top of that , is caused by thermal expansion of water in the oceans (thermal expansion because the oceans have been warming up more every year).
Allowing for some minor fluctuations from retention/release of surface water on land (and similar changes in ground-water) , we find that MSL shows a strong upward trend during the 20th Century - as measured by tidal gauges and in recent decades, by the more accurate satellite measurements. And the rising sea level rate has been even stronger during the past 20 years. Look at the Global MSL, and you will see an even more impressive rise during 2015.
These findings all point in one direction - and they are entirely inconsistent with the idea of a preponderance of cold events and more build-up of snow & ice-sheets.
It may seem cold where you are : but the planet itself is telling us a different story. The totality of evidence shows that the Earth is continuing to warm up. Nor can the scientists find any reason for it not to continue warming - and that's because there's more solar radiation entering Earth than radiation leaving Earth (the planet hasn't yet reached equilibrium from the effects of current Greenhouse Gasses - and worse, the GHG's are continuing to rise: e.g. CO2 is now above 400 ppm, and climbing) .
Overall, it is clear that AGW hasn't paused or reversed.
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Nick Palmer at 23:21 PM on 18 May 2016What Sir David King gets wrong about carbon pricing
Hi Baerbel! Could you send me any good stuff you might have on how to start implementing a carbon tax with full or partial dividend? I'm on our local government's advisory panel to their Energy Policy Executive and they've asked me to submit some carbon tax stuff. I have my own information but I'd like to see a different perspective to keep me as up to date as possible. I'm still on the usual email
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sam13501 at 21:49 PM on 18 May 2016It's cooling
Eclectic @270 No I didn't list 'warm events' because they seem to be in decline, for example off the top of my head from what I have seen on the tony hellar blog: There are less days over 90,95,and 100*F now than there were in the 30s and in the 60's.. the 1930's were very hot..117F in melbourne australia at 8am, 1 year in the 30's (i forgot which one) 45 days over 100*F in Indiana.. so 'hot events' are days that are over 100F, there are less of those now than there were in the past using US HCN weather stations.. and this purported 'sea level rise' is measured in milimeters; I feel that such a thing is easily fudged.. how much could it possibly be if even nasa.goddard is forced to admit (in that link i copied) that ice in antarctica is increasing over time, and you can see from those 2 photos of greenland, also from nasa, those photos there is clearly much more ice in 2015, than there was a few years ago..just another 'rebound'? I think the real culprit are the solar minimums that seed clouds, increase volcanic activity. bend the jet-stream, and radiate less heat toward earth.. that's alot for the greenhouse effect to overcome.. so as of right now, we got more ice and less hot days, intense winters with superblizzartds and winters that drag on..you can only imagine what its going to be like in 2019-24 when the current solar cycle finally reaches it's minimum
Moderator Response:[RH] This is running very thin here with cherry picked materials. I'd highly suggest you spend some time looking at actual scientific research over climate denier blogs.
Please note that posting comments here at SkS is a privilege, not a right. This privilege can be rescinded if the posting individual treats adherence to the Comments Policy as optional, rather than the mandatory condition of participating in this online forum.
Please take the time to review the policy and ensure future comments are in full compliance with it. Thanks for your understanding and compliance in this matter.
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BaerbelW at 21:19 PM on 18 May 2016What Sir David King gets wrong about carbon pricing
I'll 2nd what sauerj mentions at #1 - but then I'm obviously (also) biased, being a member of CCL in Germany where we recently came together in Berlin for our 2nd annual meeting. Thanks to weekly European calls, I'm also in regular contact with Judy and Brian from the UK who wrote the article. CCL is a great way to get something done climate-wise with like-minded people in an ever growing global network.
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Eclectic at 20:19 PM on 18 May 2016It's cooling
Sam @268 and @269 , you've gone to some trouble to list an impressive number of "cold events". But have you been genuinely skeptical enough to draw up a comparable list of "hot events" occurring during the same 2014-2016 timespan ?
Since sea-levels are rising, and rising at an accelerating rate . . . the obvious conclusion is that your "cold events" are very much smaller in effect than the hot events.
Cherrypicking only what you want to look at, is a tempting occupation, but you should keep the overall picture in mind. And the overall picture is that the Earth is warming. In other words, the NASA and NOAA scientists are correct in their assessment of global warming. You have misunderstood the data and science.
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SirCharles at 18:57 PM on 18 May 2016Explainer: 10 ways ‘negative emissions’ could slow climate change
Survivable IPCC projections are based on science fiction - the reality is much worse
https://www.youtube.com/watch?v=8akSfOIsU2Y
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sam13501 at 18:39 PM on 18 May 2016It's cooling
way more ice in 2015 than there was a few years ago..oh i know, it's just 'rebounding' yea rebounding from the solar minimum:
2112: LINK
2015: LINK
Moderator Response:[RH] Shortened links that were breaking page formatting.
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sam13501 at 18:36 PM on 18 May 2016It's cooling
In April in the NE,USA there was a 'white easter', during the month there was 16 feet of snow in PA, even more in colorado..and it's STILL cold even as of middle of May.. it has snowed for the first time in many tropical area's.. as these agencies claim 'this is the hottest ever' .. they actually said this april was the hottest ever..and april in which it was freezing everyday..makes no sence! There were more hot days in the 30's than there is today here even your friends at nasa-goddard admit there is global cooling:
http://www.nasa.gov/feature/goddard/nasa-study-mass-gains-of-antarctic-ice-sheet-greater-than-losses
you can't say there is global warming when the ice is increasing! Ice is increasing in greenland.. and i been tallying the mini-ice age as it progresses..lets take a look..isn't it about time you briliant scientists admit that the greehouse effect has been greatly exagerated:
Partial List of extreme cold weather anomalies since 20142014 ALL US states below freezing RARE
* 92% ice cover on the great lakes US
* cold records broken in NZSNOW RECORDS BROKEN AND HEAVY SNOWS:
* 2014,15 heavy snow in Atlanta and Houston RARE
* 2015 Cappricotta Italy one day snow record
* 300 year snow record in Hokkaido, Japan
* 2015 snow fall record broke in Nova Scota
* Hallifax snow 18X higher than normal
* 2015 Boston 270 snow record broke
* Buffalo New York ALLTIME snow record
* Snow in Huntington Beach ca RARE
* 2015 great lake USA ice cover lasting until June, months longer than normal
* 2015 Heavy Snows in Syria & Libya + many other ME countries, very RARE especially so widespread
* Snow last 2 years in Vietnam RARE
* Snow in July in Hawaii at 10,000 feet RARE
* Snow in August in Calgary Canada RARE
* Snow in August in SOUTHERN China RARE
* 2015 August Snow is Montana, and Wyoming
* 2015 August cold records for Billings MT, Denver CO, Mitchell SD, Watertown SD, Shrevepost LA, Monroe LA, Texarkana AR, El Dorado AR, Tyler TX, Longview TX + many others, Broke.* 2016 January snow for the first time in central Vietnam, heavy snow all over vietnam unbeleivable picts: http://english.vietnamnet.vn/fms/vietnam-in-photos/150560/in-pictures--snowfall-in-central-vietnam-for-the-first-time.html Okinawa-first snow ever. Hiroshima-55 inches of snow, Hong Kong records 3rd coldest day on record.
* 2016 March: cold records broke all over US and more snow in tropics, NY and Boston have coldest March in 100 years. Vietnam had 1 foot of snow 300km south of hanoi.. Heavy snow again in central mexico. New York's Whiteface Mountains reached an insanely cold minus-78.88C ; Taiwan and Kuwait receive first snow on record.
* CROP FAILURE wheat crop fail from intense lanina late colds: http://www.agweb.com/article/concerns-mount-over-freeze-damage-to-winter-wheat-crops-naa-associated-press/
* 2016 Pakistans meteorological dept. issues a report predicting global cooling as a result of solar activity. Pakistan is 2nd government so far to issue global cooling warning after Russia did earlier.* 2016 March 22 wheat crop damage in US due to freeze. http://www.bloomberg.com/news/articles/2016-03-22/freeze-across-great-plains-has-farmers-watching-winter-wheat
* 2016 Russian wheat crop damaged by ice.
* 2016 April snow in PA,USA in april, media refers to phenomenon as 'snow-showers'. The forcast is then upgraded to 3-12" of snow blanketing PA & MW, and NE region. NY and other states record their coldest April day on record. Heavy snow in Colorado-between 15"-32" snow in April. Snow records for April broken in CO & WY.
* 2016 April 1st snow reported in the Carribian. Guadelupe snow in April described by Dominica News as "extrodinary weather phenomenon"
* 2016 April, less than 5% of wheat and oat crop planted as of mid-April; cold and wind preventing fieldwork http://www.agweb.com/article/cold-wind-hamper-fieldwork-in-north-dakota-naa-associated-press/
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denisaf at 16:49 PM on 18 May 2016Explainer: 10 ways ‘negative emissions’ could slow climate change
The operation of the exisitng vast infrastructure is using fossil fuels at an unsustainable rate. The best that can be done is to reduce that rate of fossil fuels as quickly as economically and physically possible. All these measures can possibly do is slow climate disruption and ocean acidification warming very slightly where they are practical and do not have unintended consequences. They certainly cannot ease the future situation significantly. They just convey a false sense of possible amelioration when most attention should be on sound mreasures to cope with such issues as sea level rise.
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dvaytw at 13:46 PM on 18 May 2016Models are unreliable
Ps- never mind. Comment withdrawn:
Bates’ Embarrassment: Sad and Sloppy Climate Sensitivity Study
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Prism at 13:22 PM on 18 May 2016Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
For perspective, 7 billion people standing in close formation would fit within the boundries of Los Angeles. A very, very small space compared with the occupiable land area on the earth.
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Tom Curtis at 13:11 PM on 18 May 2016Breathing contributes to CO2 buildup
DailySledge @60, the industrial revolution started in 1750, not 1850. As a result, from 1750 to 1849, industrial emissions of CO2 from the burning of coal amounted to 1.25 billion metric tonnes of Carbon. While only, approximately, a sixth of current annual industrial emissions, it still represents a substantive contribution to global warming. The contribution from Land Use Change was approximately the same as that from fossil fuel consumption in 1850 (spreadsheet), and is likely to have exceeded it beforehand. Together, these contribute to an annual increase of 1.3 ppmv in CO2 concentration over the period 1750-1849. However, probably more significant was the significant reduction in volcanic activity over the period, combined with an increase in solar activity. So your quadratic fits retrodiction of a positive temperature trend prior to 1850 is accurate as far as that goes, but misleading in that there have been substantial changes in the importance of different forcings over various intervals within the quadratic fit.
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billev at 12:50 PM on 18 May 2016The things people ask about the scientific consensus on climate change
What I'm asking is what method has been used to measure CO2's contribution to global temperature rise?
Moderator Response:[PS] See here for direct measurement. See "There is no empirical evidence" for other papers measuring the effect. (Harries, Wang, Evans, Philipona, Grigg, Chen all on that page). The IPCC chapter on "Attribution" covers methods for working out contribution in excruciating detail.
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Bob Loblaw at 12:06 PM on 18 May 2016Breathing contributes to CO2 buildup
It doesn't look like DailySledge has read all the comments to this article. The comment that "An increasing population does by breathing incrementaly contribute more CO2 gas to the atmosphere" has already been addressed (e.g. here).
Long story short, as scaddenp points out: more people store more carbon, so an increasing population has to be a carbon sink, not a source.
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dvaytw at 11:54 AM on 18 May 2016Models are unreliable
Should we all be jumping for joy?
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scaddenp at 11:38 AM on 18 May 2016Breathing contributes to CO2 buildup
I dont see how we can "breath out more than we take in". We take C in via our food, and emit in breathing. While we live, we are carbon sink.
The contribution of changes in biomass since 1750 is detailed in the AR5 WG1, p486, table 6.1. The total land to atmosphere change is estimated at 30 PgC +/- 45. Compare that fossil fuel contribution of 375 PgC +/- 30.
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sauerj at 09:58 AM on 18 May 2016What Sir David King gets wrong about carbon pricing
I recently joined Citizen's Climate Lobby (CCL). This group is wonderful! They advocate for Fee & Dividend using a relationship-building, respectful, kind approach. They have great resources. There are CCL chapters all around the world and in about every congressional district in the US. If you are looking for an way to plug-into effective action, please take a serious look at CCL! Their cause (CFD) is the most effective way to really start reducing carbon emissions. Email the local chapter leader and they will quickly get you involved. You will be glad you did. PS: They don't hound you for money; but they will hound you for your time and talent.
Also, read 'The Case for a Carbon Tax' Dr. Shi-Ling Hsu. Great book!
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DailySledge at 09:21 AM on 18 May 2016Breathing contributes to CO2 buildup
'By breathing out, we are simply returning to the air the same CO2 that was there to begin with.'
As biological engines we consume energy and produce waste, given we live on a planet that has finite mass of elements with the only addition to the total mass coming from stellar objects the I think it's safe to say in it's simplest terms the statement is correct.
CO2 measurements have been taken for many years and have been rising in concert with rising global temps with records extend back to 1850 showing a dramatic increase. Taking those temp records and using quadratic equation to extrapilate the curve of incidence, it shows that temp increases began before 1850, although incremently slower the trend was upward and this is before fossil fuels became popular, increasing trend can be attributed to increasing carbon based energy usage, which is directly related to and attributed to the increase in population.
Dramatic increases in modern CO2 levels are directly or indirectly linked to man and his actions in most cases.
A reducing biomass that converts CO2 to stored carbon coupled with mankind's increased CO2 producing enviroment and life suggest's the balances that we assumed as constants no longer apply.
If we are producing more CO2 than the global environment can absorb then the outcome is obvious, if the environments that can absorb CO2 keeps reducing or slow's down uptake due to excess CO2 then problem further compounds global impact.
If we were to compare increasing CO2 levels with global population increases we see much the same trend and increases as we see with fossil fuel usage if looked at solely.
An increasing population does by breathing incrementaly contribute more CO2 gas to the atmosphere, which does contribute to global warming and rising temps, by the time CO2 is converted and stored as carbon it will added it's own impact which add's to rising temps.
CO2 is as a gas, a pollutant, we breath out more than we take in so we add to the combined total of CO2 increase, it is posionous or hazardous depending on it's concentrations to most living organism.......
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billev at 07:12 AM on 18 May 2016The things people ask about the scientific consensus on climate change
The current level of CO2 is 400 parts per million which means there is one cubic foot of CO2 for every 2500 cubic feet of air. What is the measure of how much temperature rise is caused by this amount of CO2?
Moderator Response:[PS] You might like to look at the myths "CO2 is just a trace gas" and "CO2 only causes 35% of warming". You might like to clarify your question. I assume you mean how much of the temperature rise since pre-Industrial is caused by increase of CO2 since then. With 0% CO2 in atmosphere, earth would be frigid ice ball. Do you mean how much temperature rise by direct radiative effect, or how much by radiative plus feedbacks? (decreased albedo, increased water vapour etc).
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villabolo at 04:14 AM on 18 May 2016Mars is warming
GPWayne, your link to Fred Thompson in the green box no longer works.
Moderator Response:[GT] Thanks, we will update the link.
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denisaf at 11:35 AM on 17 May 2016The things people ask about the scientific consensus on climate change
It is ironical that this discussion is misleading as it is the operation of technical systems that have contibuted to climate disruption and ocean acidification and warming. Human have only made the decisions that led to these unintended consequences of the technical systems using fossil fuels.
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JWRebel at 04:01 AM on 17 May 2016Explainer: 10 ways ‘negative emissions’ could slow climate change
Very interesting summary and links. I fear that many of us are rather to sanguine about the clock we are on. The carbon budget can easily be optimistic:
- Current temperature anomalies, even if outliers, bring us within striking distance of the 1.5° C.
- Equilibrium temperature would be for current CO² levels is also uncertain, but we are not there yet.
- If positive feedbacks (permafrost, methane) or other discontinuities appear, there will be less scope for further human manipulation of climate.
The modelling and especially the costs for NETs does not seem very far along yet. (e.g., between £15 and £361 per tonne: that would make quite a difference if you were buying steaks!) Personally I feel CCS and BECCS seem to be sexiest and getting the most attention, but confidence in costs and scale seems unwarranted. Accelerated olivine weathering is often skipped altogether, but it is a natural process, extremely scalable, and according to Schuiling possible at $10/ton of CO².
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MA Rodger at 20:41 PM on 16 May 2016CO2 is not the only driver of climate
Ken Kimura @24.
I find your comments curious, extending as they do initially beyond this thread. Note here @24 you say you intend a couteous enquiry and see nothing to suggest you are not doing so. This is followed by a set of questions that imply you consider the person you address to be, if not sincere, not to be trusted. "...this claim of yours." "How can you be sure..."
The science being discussed here is not anybody's personal property. Scientific knowledge is open access thus owned by all. That is what makes it so powerful. (Having written this, I am conscious that I now embark on addressing questions that do have ownership and with answers that have a single author and so could be wholly disowned elsewhere.)
Picking up a word in your questioning @24, "How did they measure the stratospheric aerosol density during the period?", you might find Sato et al 1993 a worthwhile read (PDF here). This paper predates the appearance of the ice core data which has allowed the record to be extended back before 1883 with far greater confidence and accuracy.
Further, I am mindful that there may be a not-uncommon misconception buried within your various questions. You perhaps are of the view that early indstrialistaion was entirely driven by fossil fuel use, initially exclusively coal, and if this were so would we not have had from its earlierst times CO2 emissions & SO2 emissions in a constant proportion (until SO2 pollution was reduced in the 1970s). However, the contribution of mankind's rising CO2 emissions from burgeoning coal use only overtook the mounting emissions from low SO2-emitting wood burning in the 1910s, apparently. (CDIAC FF data & CDIAC LOC data.)
Perhaps for completeness, I should add that the forcing from GHGs in those early decades is often dismissed as too small to have significantly affected global temperatures pre-1940. Yet, if you examine the rise of atmospheric CO2 since pre-industrial times (IPCC AR5 data to 2011here), 27% of today's atmospheric CO2 rise causing 31% of today's CO2 forcings were present by 1940. And with their slower increase, the temperature response would likely be closer to 40% of today's total. But saying that we should be sure not to forget "CO2 is not the only driver of climate."
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michael sweet at 20:36 PM on 16 May 2016CO2 effect is saturated
Tom,
I was hoping that if I made an error that you would step in and correct it. Your summary is correct.
As I understand it, there is a great deal of variation in how radiation gets into space Your post above at 412 shows a small atmospheric window where some IR gets through the atmosphere from the surface. Other wavelengths have different efective mean altitudes of emission depending on how efficiently they are absorbed/radiated by the active molecules. The tropics is different from the Arctic and desert is different from the ocean covered areas. Your post includes all these details.
I meant the "essentially" to summarize all that information and your post at 423 into a single sentence. For the most basic explaination of the greenhouse effect if we assume that all radiation is emitted at 6 km than the explaination of increasing emission height affecting surface temperature is simplified. After one uderstands the basics of how temperature increases due to increasing emission height than the additional details you relate in 423 can be added.
You may be correct that the details are required, but I think it helps to understand the basics by simplifing the complex details. I think here we only differ in what we think is the proper way to simply explain how the greenhouse effect works (and your posts have much better graphics than mine). For more advanced readers (who read but do not comment) your post gives them additional detail so that they understand the effect better than my simplification.
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Tom Curtis at 18:05 PM on 16 May 2016CO2 is not the only driver of climate
Ken Kimura @24, anthropogenic aerosols are well known because the types and quantities of fuels burnt in various countries are well known, and so the production levels are known. Similarly, for volcanic aerosols, the size, force and duration of volcanic activity is also known, given an approximate indication of volcanic aerosol production. More importantly, aerosols are found in ice cores from Greenland, Antarctica, the Rockies, Andes and Himalayas, and also from Mount Kilimanjaro and (I believe) Mount Kenya from tropical Africa. The aerosol density at different levels in the ice cores can be compared to equivalent density levels in recent cores, which are then correlated with satellite measurements of aerosol optical depth. Combined, these give a reasonable though not perfect measure of aerosol optical depth going back hundreds of years.
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Christian Moe at 16:49 PM on 16 May 20162016 SkS Weekly News Roundup #20
Please note: The title for Screen and Francis' piece at CarbonBrief is wrong (the link is right). It should be "How the Pacific Ocean alters the pace of Arctic warming". Nothing to do with ExxonMobil.
Moderator Response:[JH] Correct article title (headline) inserted. Thank you for bringing this glitch to our attention.
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Eclectic at 15:28 PM on 16 May 2016CO2 is not the only driver of climate
Ken Kimura @24 , let me be quick to assure you that Tom Curtis was not the only one to see your: ". . . started long before 1940" comment as insulting (or something very close to that).
Perhaps you didn't mean it that way . . . or only meant it at some subconscious level . . . or at another level, meant it disingenuously. Or all three ways at once [such is the complexity & inconsistency of the human mind] . But your comments had a general background context or "tenor" which would lead Tom to his conclusion quite naturally and automatically, I do believe.
Aerosol reflectivity can be measured from ground stations; and in more recent decades from satellite observations; and measured indirectly by correlation with the observed changes after each significant volcanic eruption. [Instrumental measurement or proxy measurement]
For the accuracy of the measurements & estimations, you might care to consult the original scientific papers that investigated such phenomena. But, unless you have good reason to doubt their bona fides [in which case you should declare your hand : and show the evidence you rely on for such opinion] . . . then your question is a side-issue, which need not distract us from the main thrust of your inquiry.
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MarcusGibson at 15:00 PM on 16 May 2016Alarming new study makes today’s climate change more comparable to Earth’s worst mass extinction
I often wonder whether we're really the first 'intelligent' life on Earth.
After all, we haven't been around long enough to leave any fossils of ourselves. Even if we had, all but Siberia will have been subducted by continental drift before 'intelligent' life evolves again another 250m yrs.
They'll never even know we were here, butt for one or two rare 'London Hammer' type relics in the Mongolian Steppes.
This would explain the (unexplained) drop in the 13C/12C isotope ratio before the Great Dying. Another lifeform - like us - might have madly burned fossil fuels for 200 years before triggering their own extinction.
It would also explain the Fermi paradox.
The reason we've never found evidence of intelligent life in the universe is that every 250m yrs or so, sentience springs up for the briefest moment - just a hundred thousand years. Then it discovers fire, and carbon-based fuels, and the acquisitive behaviours and superstitions that helped it thrive, wipe it out in a cosmic blink.
Over an over. Across the universe. Little flashes of thought that never manage to coincide.
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Ken Kimura at 14:34 PM on 16 May 2016CO2 is not the only driver of climate
Tom Curtis @23.
"For you to then turn around and ask "you know that the industrialization started long before 1940" looks like a calculated, and hypocritical insult."
I had no intention to insult you.
And I have no idea why you thought so."With regard to your former question, stratospheric aerosols are almost exclusively from volcanic erruptions."
I have at least 3 questions.
1) What are the evidences of this claim of yours?
2) How did they measure the stratospheric aerosol density during the period?
3) How can you be sure that their mesurement was accurate? -
bozzza at 14:16 PM on 16 May 20162016 SkS Weekly Digest #20
(.. as a get-out-of-jail-free clause can I appeal to the idea that science doesn't even understand what 'current conditons' are?)
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bozzza at 14:13 PM on 16 May 20162016 SkS Weekly Digest #20
Tom,
Of course I trust your words and will read your links but I just find it impossible to believe long term structural integrity is not at stake.
Of course, I shall read... (not that I like reading much- obviously!)..!
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Tom Curtis at 12:20 PM on 16 May 20162016 SkS Weekly Digest #20
bozza @2, studies with models show that under current conditions, complete removal of sea ice will not prevent its reformation in the next year. While sea ice models have problems, the rapid recovery to trend levels of sea ice after 2007 and particularly 2012 show that in this case the models are correct. Hysteresis is, therefore, not currently a factor in Arctic sea ice, and probably will not be until we reach near permanent absent of Arctic sea ice, even in winter (if then).
In this sea ice contrasts with land ice, where there is substantial evidence we have reached a point of hysteresis for parts of the West Antartic Ice Shelf, and possibly for Greenland.
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Tom Curtis at 12:14 PM on 16 May 2016CO2 effect is saturated
michael sweet @422, I strongly suspect your attempt to answer Concerned Citizen's question will be fruitless. The evidence strongly suggests he is interested in obfustication rather than learning. That is clear from his continuous changing of the question he asks, and he refusal to accept any response as accurate or relevant (despite the responses to his questions having been both).
In attempting to answer Concerned Citizen, however, you stated that "Essentially all the energy emitted by the Earth is at the 6.0 km altitude". That is not correct. The "effective mean altitude of radiation" is approximately 6 km, but the effective mean altitude of radiation is just that altitude in the troposphere at which the globally averaged temperature is the same as the brightness temperature of the IR radiation from Earth, averaged globally and across all frequencies. That that is not the same as the altitude from which essentially all radiation is radiated is most easilly seen by comparing the 6 km temperature to brightness radiation of emission from real observations (in this case averaged over April to June from the Central Pacific for two seperate years, see Harries et al, 2001)
Note that the spike at 1050 cm^-1 is from stratospheric ozone, and is at a much higher altitude than other emissions shown. The central spike from CO2 emissions at 667 cm^-1 is not shown as the graph cuts of at 700 cm^-1.
Just looking at brightness temperatures, unfortunately, will give a mistaken impression as to the effective mean altitude of radiation, as brightness temperatures do not show the intensity of radiation at different wave numbers. For that we need a more traditional emissions spectrum:
In this case we have two such spectra, a clear sky spectrum and one from a thunderstorm anvil. Many cloud spectra will be from lower altitudes. It can be seen, however, how the combination of maximum intensity of surface emission near the CO2 absorption band, combined with the effects of clouds result in an "effective mean altitude of radiation" at around 6 km.
I am fairly certain you knew all this already, but your choice of words leads to an easy misunderstanding, and IMO one that would create confusion if not clarrified.
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bozzza at 12:08 PM on 16 May 20162016 SkS Weekly Digest #20
The concept of Hysteresis means long felt multi-year ice melt remains the reality. The kids will read about it in the akashic record called NSIDC as if it were reality tv!
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villabolo at 09:51 AM on 16 May 20162016 SkS Weekly Digest #20
From NOAA:
La Niña is favored to develop during the Northern Hemisphere summer 2016, with about a 75% chance of La Nina during the fall and winter 2016-17.
Is this likely to have an impact on the Arctic icecap's Minima?
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michael sweet at 23:48 PM on 15 May 2016CO2 effect is saturated
Concerned Citizen,
The temperature lapse rate is the amount the temperature changes as you increase altitude. It is about 6C per kilometer. That means that if you increase in altitude by one kilometer the air is 6C cooler.
Essentially all the energy emitted by the Earth is at the 6.0 km altitude. This amount of energy equals the amount of energy that arrives each day from the sun. If you increase the amount of CO2 in the atmosphere than the CO2 absorbs more of the energy coming up from the surface. The emission height raises to 6.1 km. This we have agreed on.
Heat is emitted from all materials in amounts proportional to the temperature. When the emission height increases to 6.1 km, less energy is emitted because the air is colder. This is because of the temperature change, not the change in pressure. There is an imbalance between what is arriving from the sun and what is emitted. This imbalance causes the Earth to heat up.
In order to reach a new equilibrium where the heat emitted from the atmosphere is the same as the heat arriving from the sun the temperature at 6.1 km has to increase. Because the lapse rate remains the same, the temperatue of the entire air column under 6.1 km increases the same amount as it increases at 6.1 km. Since the lapse rate is 6C per km the temperature has to increase about 0.6 C if the emission altitude increases from 6.0 to 6.1 km. When the rest of the air column increases in temperature the surface is 0.6C warmer. This is the global warming caused by the increase in CO2.
Do you understand the way that the increase in the emitting altitude (caused by the increase in CO2) results in an increase in the surface temperature?
The atmospheric pressure does not increase measurably from the increase in CO2. This is well known and no-one has suggested that atmospheric pressure changes the temperature. This is an example of a basic misunderstanding that needs to be corrected.
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ConcernedCitizen at 19:19 PM on 15 May 2016CO2 effect is saturated
michael sweet @418 Yes, I know about the temperature lapse rate, didnt 'Air at 6,1 km is thinner, I now that, I already said its colder' make that self evident?
So far not one of you has been able to describe the physics, the mechanical process, whereby putting an additional CO2 mollecule at 6.1 km raisies temperature by interaction wioth the lapse rate.
The lapse rate is based on atmospheric pressure, so if you added enough CO2, yes, you would increase the atmorpheric pressure, but this isnt the suggestion here and certainly isnt hapening because atmopspheric pressure isnt increasing.
So again, in the absence of any logical and clear explanaiton the explanation given here holds no water.
Moderator Response:[JH] If you cannot be civil, you will forfeit your privilege of posting comments on this site.
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denisaf at 16:48 PM on 15 May 2016Skeptical Science wins 2016 NCSE Friend of the Planet award
I have seen a list somewhere of the cities that are likely to be hard hit by sean level rise and storm surges. London, New York and the Netherlands have massive works in progress to cope with this predicament.
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Tom Curtis at 10:40 AM on 15 May 2016CO2 is not the only driver of climate
Ken Kimura @22, I discuss the trend from 1940-1970 because you asked a question about the trend from 1940-1970, and for no other reason. For you to then turn around and ask "you know that the industrialization started long before 1940" looks like a calculated, and hypocritical insult.
With regard to your former question, stratospheric aerosols are almost exclusively from volcanic erruptions. Tropospheric aerosols are from a combination of wind born sea salt, refractory compounds from forest, desert sand and anthropogenic factors. Forcings, however, represent the change in a factor over time, and the vast majority of the change in tropospheric aerosol load is from anthropogenic factors - primarily from sulfur in coal and oil. As can be seen from this graph from the IPCC AR5, the combined anthropogenic effect (red line) from 1940-1970 results in a positive slope in forcing:
The combined anthropogenic plus natural forcing is flat or negative due to the lack of volcanic erruptions from about 1915 and the onset of a large eruption (Agung, 1963-4) along with a number of smaller eruptions.
Note that the above graph sets the zero point for forcings at 1750 rather than the 1880 used in the GISS forcing graph you pointed to, and the Meinhausen 2011 forcings displayed in the model to which I linked.
With regard to the relation between anthropogenic GHG forcings and anthropogenic aerosol forcings, initially the aerosol forcing from oil and (particularly) coal dominate in the short term, but with steady state use the GHG forcing comes to dominate very quickly. That is because the initially dominant aerosol load is quickly washed out of the atmosphere by rain, while the GHG concentration (particularly CO2) accumulates. With accelerating coal combustion, these factors can approximately balance for a while, as can be seen from 1750-1860 above, but in the 20th century the GHG forcing has been stronger both because of the accumulation of CO2 in the atmosphere and a gradual switch to cleaner (ie, less sulphur content) fuels.
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Eclectic at 22:47 PM on 14 May 2016There's no correlation between CO2 and temperature
Ken @53 , there is something in what you say ~ yet you misunderstand the basic Modus Operandi of this SkepticalScience website.
When you ask a question or dispute a point, then your post will show in the Recent Comments page . . . where everyone will see it, and those who wish to reply will have the opportunity to go to your chosen thread. As a matter of course, the replies will also be funnelled through the Recent Comments page too. This way everyone can see them conveniently, and those who wish to add to / correct / or dispute those replies, will be able to do so.
So you see, that way you will get the best range of views / opinions / controversy / facts / useful links ~ all in the shortest time. And most conveniently all round.
It is a sensible & efficient arrangement ~ which is why I recommended that you keep your particular cluster of questions in one thread only. If you develop entirely unrelated questions as the discussion progresses . . . then it's best to get the first question(s) sorted out, before going on to another topic / another thread. It is best to progress step-by-step, reather than throwing up a large number of questions.
( Simultaneous multiple-pellet "shotgun" questioning is viewed poorly . . . since it's usually a sign of lack of sincerity in the poster ).
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Ken Kimura at 15:22 PM on 14 May 2016There's no correlation between CO2 and temperature
Eclectic @52,
This thread and the other thread(and many others) are closely related.
And many members post their opinions into these threads.
So it is inevitable their opinions overlap.
Hence, it is also inevitable that questions to them overlap.
I don't see why asking similar questions to different members is discouraged.
People have different opinions so that their answers may differ. Knowing different answers(some may be right, some may be wrong) is usually useful for most people.
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