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Marcin Popkiewicz at 07:28 AM on 23 May 2014Record growth of atmospheric CO2 in 2013
In the years after a major volcanic eruption (i.e. when there is an abundance of sulphate aerosols in the atmosphere), heterotrophic respiration decreases due to a lowering of the Earth’s surface temperature and the productivity of ecosystems in forested area increases under enhanced diffuse radiation. Both processes lead to a negative anomaly in CO2 growth rate. See Wang 2013, Gu 2003, Frölicher 2013
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jamesprescott at 04:42 AM on 23 May 2014Record growth of atmospheric CO2 in 2013
Why do volcanoes reduce interannual CO2 rise?
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jyyh at 03:09 AM on 23 May 2014Record growth of atmospheric CO2 in 2013
"Previous non-El Niño record was surpassed by 0.53 ppm, which (W)as also a record"
As strong el Ninos are not necessarily natural, it's no surprise nature has hard time adjusting to them.
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John Hartz at 02:01 AM on 23 May 2014Looking for connections
Everyone particpating in, or reading, this comment thread will want to check out Tom Engelhardt's new essay posted today on TomDispatch.com.
Engelhardt's essay is titled, The 95% Doctrine - Climate Change as a Weapon of Mass Destruction
It answers the question: Is Climate Change a Crime Against Humanity?
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saileshrao at 00:44 AM on 23 May 2014Looking for connections
Lionel A @ 14,
"Whilst one could blame the British for starting the exponential rise of CO2 through industrialization one should ask is such blame well placed. For much of the period humans were ignorant of the effects of rising greenhouse gas levels on the atmosphere at Earth's temperature."
The Law of Karma has been well-known in the East for several millennia. It is the specifics of the Earth's reaction to a particular depredation that we're now beginning to unravel through science.
The colonialists deliberately chose to deride every piece of wisdom that they found in the indigineous communities that they ruled by force. Therefore, the ignorance was wilful, not unwitting. -
saileshrao at 00:33 AM on 23 May 2014Looking for connections
Glenn Tamblyn @16:
"Discovering that we have unwittingly caused harm and then continuing to do so is immoral."
Thank you for this statement. It explains why some people want to repudiate the science of climate change: it clashes with their moral being as they find it hard to accept their past "immorality", even if it was unwitting. This understandable denialism also explains why most climate scientists continue to eat animal foods, despite the overwhelming evidence of disappearing forests that satellite images have brought into plain view (see http://globalforestwatch.org ). -
Lionel A at 00:17 AM on 23 May 2014Looking for connections
chriskoz
austrartsua has probaly the anthropic principle in mind.
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Composer99 at 00:16 AM on 23 May 2014Looking for connections
chriskoz, that's probably some form of the anthropic principle. Possibly a stronger variant thereof.
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chriskoz at 00:06 AM on 23 May 2014Looking for connections
austrartsua@7,
Small changes in radiative forcing would lead to large swings in the systems temperature. Such a system would probably not be long-lived and certainly would be unlikely to support a bio-sphere for billions of years.[...] you can think of [...] a combination of the Gaia hypothesis and the anthropogenic principle
Note that your "large swings in the system temperature" is not a correct statement. The main negative feedback, not mentioned by anyone yet, not allowing such swings is the increased outgoing IR due to increased temperature. This feedback does ensure that once the planet reaches the radiative equilibrium, it will not warm anymore. Well it'll warm slightly due to slow positive Earth System fedbacks like carbon cycle (e.g. thawing permafrost). But the system as a whole cannot axperience any "large swings", because the omnipresent outgoing IR negative feedback will counteract all Earth System effects.
Your "Gaia hypothesis" can be viewed as a "spiritual take" of the theory of rock weathering, explained by scaddenp@10. However, I have no clue what your "anthropogenic principle" (?) is. I've never heard such term and am puzzled what you could have meant. Please explain.
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chriskoz at 23:27 PM on 22 May 2014Sense and climate sensitivity – more evidence we're in for a hot future
Klapper@40,41
Despite my assertion @29 not to consider climate change in any chinese locality in isolation from the rest of the globe, you did precisely what I warned against (i.e. you "boxed" a convenient cherry area, where temperature trend supports your preconceived claim), therefore you've implicitly denied the validity of my assertion.
Maybe you should open your mind at this point, at the fact that climate change is not only about CO2 and aerosols forcings and cherries. Climate change is about variety of phenomenons, including but not limitted to athmospheric and ocean fluid dynamics, water vapour transport via winds and convection and associated rainfall patterns, etc.
Let's consider for example changes in rainfall over China in last 50y from the widely cited article: (Xu 2001). Xu found that due to the changes in heat equilibrium of the land surface (due to SO2 pollution), the summer monsoon belt has moved southward. How much? Check Xu's figure 4: Average latitudes of the central axis of monsoon rain belt in summer and mid-summer. I'm eyeballing that it moved by some 5 degrees since 1960, leading to an abnormal summer climate pattern of ‘‘north [your cherry Beijing] drought with south flooding’’ It does not take much imagination to conclude that in such situation of signifficant shift in precipitations, the temperature response will also vary. Specifically, we can expect the increase in temperature for the areas that became drier, because the rain cools things down in summer. And that's what Beijing may be experiencing: drier summers due to retreat of monsoon southwards.
This is only one example that I'm giving you, without even trying to quantify the issue because I don't have time and expertise for it. This is just to show that your method of "boxing" and isolating a cherry temperature trend is not how you should aproach the complex problem of climate change in China.
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Glenn Tamblyn at 21:26 PM on 22 May 2014Looking for connections
Lionel
"one should ask is such blame well placed. For much of the period humans were ignorant of the effects of rising greenhouse gas levels on the atmosphere at Earth's temperature."
I agree. While in principal we are responsible for the consequences of our actions, there is a strong case to be made that our degree of responsibility is moderated/modulated hugely by how witting or unwitting we were when we took those actions.
Conversely, if we were unwitting and then gained understanding later, how we respond to that discovery is of paramount importance. Discovering that we have unwittingly caused harm is sad and disturbing.
Discovering that we have unwittingly caused harm and then continuing to do so is immoral.
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Glenn Tamblyn at 21:15 PM on 22 May 2014Looking for connections
austrartsua
"Suppose that the earth was highly sensitive to changes in radiative forcing of order 1C. Then the system would be unstable. Small changes in radiative forcing would lead to large swings in the systems temperature. Such a system would probably not be long-lived and certainly would be unlikely to support a bio-sphere for billions of years."
There is a fundamental fallacy in this argument which is easy to miss if we just talk about feedbacks in a purely mathematical way. That the feedbacks have a consistent magnitude. So a positive feedback is seen as being continuously positive no matter how much feedback is applied. Such an implicit idea can lead to the notion that if feedbacks are strong then a system must be unstable.
However in the real world many feedback, +ve or -ve, may be strong but of limited scope.
A good example of this is ice sheets. Warming will melt ice sheets, changing albedo and producing a potentially strong +ve feedback. Right up to the point where the ice sheets have completely melted. After that point there is no more ice to melt and ice sheet change provides no further feedback at all. Similarly cooling expands ice sheets in a +ve feedback. Until the position of continents, percentage of ocean at different latitudes etc limits further ice sheet growth.
So discussion of CS is really a discussion of CS relative to the current climate state. And there is no automatic argument that a higher CS in the current climate state (which is what we are interested in) implies a high CS in all climate states and thus an instability condition. Climate may better be described as a system that can fluctuate between several relatively stable states. Not stable. Not unstable. Metastable.
Unfortunately a transition to a new metastable state may not be good for our health.
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Lionel A at 20:22 PM on 22 May 2014Looking for connections
Whilst one could blame the British for starting the exponential rise of CO2 through industrialization one should ask is such blame well placed. For much of the period humans were ignorant of the effects of rising greenhouse gas levels on the atmosphere at Earth's temperature.
Discussion of the legacy of wealth thus gained is too complex, and politically fractious to go into much detail here other than to recognise that those enjoying the benefit of riches thus gained should shoulder proportionally more of the cost of mitigation and adaptation. This goes for other industrial and developed nations some of which have contributed proportionally much more to the GHG content of Earth's surface systems over recent decades.
But of course this does not escape from the reality that Britain became rich and powerful from rapid industrialization which was in turn made possible by the earlier agricultural revolution and the trade abetted by Britain being an island with strategic geographical advantages which made the rise of sea power for that nation almost inevitable.
However the rise in the atmospheric content of two main greenhouse gases of carbon dioxide and methane over a longer timescale has been investigated by, amongst others, William Ruddiman who has written papers and books on this topic. Amongst the latter are 'Plows, Plagues and Petroleum' and the more recent 'Earth Transformed', these are both worth looking up.
Bill Ruddiman has also written more extensive texts such as 'Earth's Climate: Past and Future'. There is a useful introduction to William Ruddiman's research at RealClimate
Debate over the Early Anthropogenic Hypothesis
When it comes to the disproportionate GHG contributions of nation states then David JC MacKay has produced illuminating literature both web based and in handy book form with 'Sustainable Energy Without the Hot Air' with Chapter 1 Motivations being of specific relevance here.
Humanity faces many growing problems due to increasing development – mineral extraction, pollution, overconsumption and a huge, and growing wealth divide. The many ethical dimensions of the issues are encapsulated in a very small but topic rich publication 'The Little Earth Book' which contains over sixty small essay chapters, well worth looking up.
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MartinG at 15:06 PM on 22 May 2014Looking for connections
Excellent observations. And since our luxury materialistic lifestyle is one of the prime drivers for growth - and hence fossil fuel burning increases in the developing world, I believe we should have a major focus on a more sustainable lifestyle in the developed world. Its no use jumping up and down and waving our arms about fossil fuel consumption and sounding the alarm about global warming if we are not prepared to change our own lifestyles. Ther best way to slow fossil fuel burning is to use less energy ourselves because we will never beat the fossil fuel industry while the demand (and hence profit) is there.
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Rob Honeycutt at 09:43 AM on 22 May 2014Looking for connections
Austratua... To add to what scaddenp said, you also can't get well know processes to operate at 1C. For instance, with only 1C for CS you don't get glacial-interglacial cycles.
There are many very good reasons, like glacial-interglacials, showing why CS below 2C is highly unlikely. The real challenges are with higher CS figures. We can't eliminate 4.5C. We have reasonable confidence that methane clathrates are not going to a problem, but we don't know for sure what could trigger releases.
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gws at 09:23 AM on 22 May 20142014 SkS Weekly Digest #20
Esop, your statement beginning "we should expect the denialiati ..." is as illogical as the denialati themselves ... the nature of denial is to deny was is real and true, ergo they will do no such thing as "admitting". Cheers!
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Tom Curtis at 08:57 AM on 22 May 2014Looking for connections
Marcin @9, are you suggesting that in a world which includes AGW deniers there are no conspiracy theories? I'm sure we can find some, if we look around and so find that my formula requires neither multiplication nor division by zero.
More importantly, I agree that the Kaya identity is accepted, and very usefull. It is not, however, accepted because of a mathematical derivation such as the one you show. It is accepted because a strong correlation between energy use and wealth (GDP) has existed throughout human history; and because the use of fossil fuels generates a strong correlation between energy use and CO2 emissions. Your derivation of the Kaya identity draws the focus away from its emperical basis, and appears to suggest it is accepted because of an empty formalism.
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scaddenp at 08:14 AM on 22 May 2014Looking for connections
Austratua- "There are also negative feedbacks which tend to keep the earth system stable in response to changes in forcing." Such as?
I dont think there is much evidence of earth system stability in response to change of forcing. More like natural forcing only changes very slowly. The only known "thermostat" is the very crude weathering feedback which operates over million year timeframes.
There is a high degree of confidence from both physics and paleoclimate, that climate sensitivity is between 2 and 4.5, mostly likely around 3. A value of 2 is more than enough to cause concern given the rate at which we are increasing the forcing. We do not have many examples from paleoclimate of changes in forcing that occur this fast. We do have evidence that rates of climate change slower than present have not been good for many species.
While the direct response to CO2 increase on only 1C, water and albedo quickly get you to 3 so you need evidence a strong negative feedback if you want to posit a low sensitivity.
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Marcin Popkiewicz at 08:07 AM on 22 May 2014Looking for connections
@Tom Curtis
This is the variation of Kaya identity (or I=PAT formula) It's generally accepted.
As to your theory that elimination of conspiracy theories would eliminate CO2 emissions. Well - that's not sure, because one would not only multiply by ZERO but also divide by ZERO in (CO2 emissions/Conspiracy theories) part.
:)
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Tom Curtis at 07:45 AM on 22 May 2014Looking for connections
Marcin, this is an excellent article, but the derivation of the formula is scientifically nonsensical (if mathematically imaculate). I could as easily derive a relationship as follows:
CO2emissions = CO2 emissions
CO2 emissions = (Conspiracy Theories/Conspiracy theories) * CO2 emissions
CO2 emissions = Conspiracy Theories * (CO2 emissions/Conspiracy theories)
and conclude that to reduce CO2 emissions we need only eliminate conspiracy theories.
Your final formula is based emperically based correlations that are also theoretically predictable. Your derivation conceals rather than illucidates that fact.
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austrartsua at 05:50 AM on 22 May 2014Looking for connections
@Will. There are also negative feedbacks which tend to keep the earth system stable in response to changes in forcing. As I am sure you are aware, the direct increase in radiative forcing cause by a doubling of the concentration of Co2 is about 1C. What else happens, is all down to feedbacks. Do we know what the tally of all these feedbacks is? Not really, it is an exciting area of research. However I would say that there is reason to believe the earth is reletively stable in the face of a change in radiative forcing of 1C, by argument of contradiction (not definitive, just a heuristic idea).
Suppose that the earth was highly sensitive to changes in radiative forcing of order 1C. Then the system would be unstable. Small changes in radiative forcing would lead to large swings in the systems temperature. Such a system would probably not be long-lived and certainly would be unlikely to support a bio-sphere for billions of years.
Is this a water-tight argument? Of course not and we really do need to work out what the climate sensitivity is. However, you can think of this argument as a combination of the Gaia hypothesis and the anthropogenic principle. If the climate sensitivity was very high, life wouldn't exist here!
So I agree, we wouldn't expect to see a linear trend, but something else. What else? That's an open question.
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Marcin Popkiewicz at 05:50 AM on 22 May 2014Looking for connections
@austrartsua
Temperature growth will be roughly linear with our emissions (they grow exponentially). See IPCC WG1AR5 SPM Figure SPM.10, also explanation on SkS.
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wili at 05:31 AM on 22 May 2014Looking for connections
Austrartsua; Perhaps, but the real world is not necessarily going to respond in a linear manner. "Discontinuities" of various sorts are likely looming. As major reinforcing 'positive' feedbacks kick in, there are likely to be sudden surprises. Alley and others point out that sudden sea level rise cannot be ruled out, and recent research has tended to reinforce this claim. Arctic sea ice melt, especially if you look at volume loss, seems to be proceeding at an exponential rate. A number of systems are likely to undergo a rather sudden phase shift once pushed (linearly) passed a certain point.
In other cases, large-scale linear processes can create large local 'discontinuities,' as when expanding tropical cells cause shifts in long-term rain patterns at cetain latitudes, for example.
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antelope at 05:22 AM on 22 May 2014Looking for connections
Ah yes. Thanks.
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wili at 05:13 AM on 22 May 2014Looking for connections
Antelope, that does seem confusing. But emissions are different from accumulation. Recall that about half of the emissions are taken up by ocean and land 'sinks.' There may be other problems with the math here, but do be sure to distinguish rate of rise in emissions from rate in rise of atmospheric concentration.
SkS, there seems to be a graph missing after the first paragraph. Great post, by the way (as usual).
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austrartsua at 05:13 AM on 22 May 2014Looking for connections
The temperature forcing caused by Co2 is logarithmic in the concentration of Co2 in the atmosphere. Log of an exponential function is a linear function. So a rough prediction of the rise in temperatures is a linear rate. This is a fact which is barely understood by most of the public.
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antelope at 05:00 AM on 22 May 2014Looking for connections
But surely, unless I've misunderstood something, CO2 emissions are not increasing at 2.8% a year. They're increasing at about 2.5 to 3 ppm. Given levels are currently at 400ppm, this isn't 2.8%.
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Composer99 at 03:02 AM on 22 May 2014Behind The Times - another manufactured climate controversy conspiracy theory
jetfuel:
Sea level rise is currently 3 mm per year, or 10 times higher than the amount you cite. That being said, any further discussion specifically pertaining to sea level rise should occur on pertinent threads, rather than this one, where it is off topic. You might find that those other posts and threads will provide links to papers published in the literature which explain the projections of higher sea level rise by 2100.
In addition, I strongly recommend that you take your inquiry regarding the scientific consensus to another thread where it is on topic. This post and thread discuss Bengtsson's views regarding climate science and the distortion of those views, in service of conspiratorial ideation, by others.
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Esop at 02:15 AM on 22 May 20142014 SkS Weekly Digest #20
A big El Nino and the corresponding spike in surface temps is not something the deniers are looking forward to, so they are in full damage control mode these days.
Over the past 6 or so years, we have seen nothing but predictions of cooling from them, so with a likely new surface temp record in 2015, we should expect the denialiati to finally admit that they have been wrong, as they have proposed no natural explanation for a new surface record, rather the opposite.
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jetfuel at 02:09 AM on 22 May 2014Behind The Times - another manufactured climate controversy conspiracy theory
What exactly is the 97% concensus for? That you can't rule out man completely for any contribution to Global Warming? There are many factors affecting sea level besides melting land based Ice or snowpack. The 0.32 mm/yr of recent SLR trend line equals 10 inches by 2100. 2 meters or 78.74 inches by 2100 requires an increase by an order of magnitude from the recent trendline.
Moderator Response:[PS] Beside being off-topic, your statement about SLR is out by an order of magnitude. If have evidence of non-climate related causes of SLR, then please take them to this thread. Using the search function to find an appropriate thread for commentary is not that hard. Further offtopic comments will be deleted.
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Composer99 at 01:34 AM on 22 May 2014There is no consensus
Is it too much to ask that people read just the infographic?
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Rob Honeycutt at 01:14 AM on 22 May 2014There is no consensus
Mytheroo... I would highly suggest you take the time to read the research paper you're commenting on. The answer to the question, "How to we get to 97%?" is there.
Of papers that take a position, 97% of the published research supports the idea that humans are the primary cause of warming.
If you like, you can use the 32% figure too, but you have to compare that, then, to the rejection rate which goes down below 1%.
No matter how you prefer to slice it, the overwhelmingly dominant position in the published literature is that human emissions of CO2 are the primary cause of warming.
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Mytheroo at 00:11 AM on 22 May 2014There is no consensus
to me it seems this study came about because:
"the skeptics don't believe that, when surveyed, climate scientists tell the truth about AGW and instead endorse it"
So, this study studies the papers instead of surveying the scientists, as it can be assumed that they are more likely to state their correct position in their papers.
The study came up with 32% Endorse AGW.
How do we get to 97%?
"oh...we surveyed them"
:-|
Moderator Response:[JH] You are skating on the thin ice of sloganeering whcih is prhobited by the SkS Comments Polcy.
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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Klapper at 13:54 PM on 21 May 2014Sense and climate sensitivity – more evidence we're in for a hot future
@Tom Curtis #39:
I checked a box around Chengdu (25 to 35N, 100 to 110 E) and found that the warming rate in CRUTEM4.2 for the last 30 years to be 0.31C/decade, so Chengdu has a similar warming rate to the Bejing/Shanghai area.
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Klapper at 13:37 PM on 21 May 2014Sense and climate sensitivity – more evidence we're in for a hot future
@Tom Curtis #39:
The most viewable map you've posted (PM2.5) shows the Bejing/Shanghai corridor to be the most polluted. I also looked at other air pollution proxies (ozone, NO2) and they showed the same thing.
Anyway here is a link which shows 2001 to 2010 PM2.5 on a grid which you can zoom in so it's somewhat better than the map you posted. The Bejing/Shanghai area is just as intense as the Chengdu area, but larger in areal extent.
http://sedac.ciesin.columbia.edu/data/set/sdei-global-annual-avg-pm2-5-2001-2010
If you are convinced that Chengdu is more representative than Bejing/Shanghai then do your own trend analysis of the Chengdu area.
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chriskoz at 12:51 PM on 21 May 2014Behind The Times - another manufactured climate controversy conspiracy theory
denisaf@9,
Consequences of "industry using fossil fuels" were "unintended" until about mid-last century, before confirmed AGW. Although there were voices in the scientific community pointing the problem of AGW even earlier: click the interactive history button on the left to learn more.
Since at least 50y ago, said consequences are known and quantified (e.g. by CO2 mass balance from Keeling Curve). Since at least 25y ago (first IPCC report confirming AGW) the consequences are intended.
(Snip)
Moderator Response:[PS] Please abide by the comment policy (No accusation of deceptions etc).
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denisaf at 11:22 AM on 21 May 2014Behind The Times - another manufactured climate controversy conspiracy theory
It is ironical that there is so much hype about combatting climate change. It is a typical anthropocentric view of reality. The simple fact is that irreversible rapid climate change is under way primarily due to the unintended consequences of industry using fossil fuels. No amount of hype will change that reality. The best that society can now do is adopt sound mitigation and adaptation policies as recommended in the latest IPCC report.
Moderator Response:[PS] Please note the comment policy prohibition on sloganeering. "The simple fact is that irreversible rapid climate change..." appears to be an assertion in contradiction to the IPCC reports you cite. If you believe this to be correct, please cite the basis for this statement.
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John Hartz at 10:28 AM on 21 May 20142014 SkS Weekly Digest #20
chriskoz: Please note that the two paragraphs of the El Niño Watch section are the first two pragraphs of the the article verbatim. The name of the newspaper is also a big clue to what "Pacific Nothwest" means in this particualr context.
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chriskoz at 08:26 AM on 21 May 20142014 SkS Weekly Digest #20
"El Niño conditions usually cause milder and warmer winters in the Pacific Northwest."
Please note that SkS is not US-centric. Therefore such shortcut may be confusing for readers outside US. A better warding would be:
"El Niño conditions usually cause milder and warmer winters in the west coast of North America" (states of CA, OR, WA & BC)
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Paul D at 05:35 AM on 21 May 2014Behind The Times - another manufactured climate controversy conspiracy theory
Regarding GWPF and Lawson...
Nigel Lawson (GWPF founder) was on the radio recently commenting on the attempted takeover of AstraZeneca by Pfizer, stating it would be a good thing.
Thankfully it never happened, but the comment did highlight the fact that Lawson cares not for science (or successful British businesses), only for markets and economics.The media seem to be obsessed with Lawsons pronouncements these days, after spending years ignoring him in his retirement.
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ZincKidd at 05:03 AM on 21 May 2014Behind The Times - another manufactured climate controversy conspiracy theory
Given the vanishingly small number of contrarian papers published for peer review, it's clear they've wanted an example of a "rejected" paper in order to claim the reason there are so few contrarian papers is they get rejected by the "conspiracy". Expect this case to be cited every time the consensus comes up.
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PluviAL at 03:13 AM on 21 May 2014Behind The Times - another manufactured climate controversy conspiracy theory
I can imagine a gadget, not to far down the road that will verify factual consensus of casual claims in writing, or speech. In this case false claims by the, supposed, conservative anti-science crowd could be eliminated by the reader. Lets imagine that the gadget might color the content acording to coroborated validity ration according to reader preferences.
We are gradually working toward that capability. The gadget is each of us correcting the discussion, keeping a higher emotional, rational, and level of knowledge and courtecy throghout the blogosphere and in opportunities for discussion. We have the facts and moral highground, we just have to keep at it. The community is getting inoculated agains the lies of the disinformation industry. And they want to do the right thing, we just have to keep figureing it out, and sharing it appropriately.
Patience, perceverence, and valid argument will ultimately win the day.
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One Planet Only Forever at 23:43 PM on 20 May 2014Behind The Times - another manufactured climate controversy conspiracy theory
Science is about constantly increasing awareness and developing the better understanding of what is going on. Politics is about deciding what actions and attitudes to encourage and reward and which ones to discourage and penalize.
Science and politics should be focused on the same thing, developing better understanding and awaress that enables humanity to develop a sustainable better future for humanity, which ultimately needs to be a sustainable robust diversity of life on this amazing planet.
However, the current global socioeconomic systems have developed many unsustainable and harmful actions and attitudes because they can be made to appear popular and profitable.
So investigation into climate, and so many other environmental and social issues, can develop better awareness and understanding of the unacceptability of popular and profitable actions and attitudes. That does not make such investigation and reporting political, but it mobilizes the political marketing of those who wish to maximize and prolong their ability to benefit from unacceptable actions and attitudes. It mobilizes actions to try to discredit the people who are creating that better awareness and understanding. And many people are easily impressed by the attempts to discredit any better understanding of the unacceptability of how they want to personally benefit.
So climate science can only "not be political" when it exclusively produces information that suits the interests of all of the wealthy and powerful. Any information contrary to the interests of any wealthy and powerful person will mobilize political action, by that person.
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Glenn Tamblyn at 22:57 PM on 20 May 201497% - A Statistically Representative Debate On Global Warming
Terranova.
Sloganeering to my understanding is, for example, about making assertions such as 'over the top' without first providing the basis for that assertion. A basic rule of debate is that conclusions follow from arguments and evidence. Asserting the conclusion without immediately showing the basis for that assertion is poor reasoning. Something may be 'over the top'. Equally the same something may be 'radically understated'. Only argument and evidence leads to a resolution of the question.
Over stridently proclaiming a conclusion without first providing a basis for that conclusion can be considered sloganeering.
The restriction here on sloganeering isn't arbitrary. It is part of a civil debate. It is actually the distinction between logic and rhetoric. Logic follow chains of reasoning to conclusions. Rhetoric tends to proceed from assumed or preferred conclusions and work back to reasons. All discussions work best when one is arguing evidence rather than conclusions.
If we work from the evidence the conclusions just 'fall out in the wash'.
Moderator Response:[JH] Terranova has been posting comments on SkS for at least a couple of years now. He should have familiarized himself with the SkS Comments Policy (which defines sloganeering) long before now.
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michael sweet at 20:15 PM on 20 May 2014Behind The Times - another manufactured climate controversy conspiracy theory
Roy Spencer also has polotical connections (see linked list of associations from Desmog blog) inlcuding the Heartland Institute and the George C. Marshall Institute. That makes 3. How many of the 3% of climate scientists that deny AGW are members of these organizations?
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chriskoz at 16:17 PM on 20 May 2014Behind The Times - another manufactured climate controversy conspiracy theory
Michael Mann, who among all of us, is in the best position to comment on this episode of denial campaign, has written an OP in huffingtonpost. A good complementary reading, well agreed with Dana's article herein.
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scaddenp at 14:54 PM on 20 May 201497% - A Statistically Representative Debate On Global Warming
You might also perfer to comment "Its a natural cycle" as place to comment. Your commentary might be better if you look at the paleoclimate section of the IPCC report first however.
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Tom Curtis at 14:11 PM on 20 May 2014Sense and climate sensitivity – more evidence we're in for a hot future
Klapper @38:
First, you are confusing two issues. First, wind disperses aerosols from their source of emissions. That means the area over which the forcing applies does not exactly coincide with the area of emission. In China, the wind initially disperses aerosols to the WSW. but as the aerosols gain in altitude that reverses and they are dispersed to the ENE. These directions vary with season, as does the distance aerosols typically travel before exiting the atmosphere. In China, that means the dispersal is to the WSW for two seasons of the year, and largely static with a thin tail to the ENE for the other two seasons.
In addition to this effect, air that is warmed (or cooled) by a given regional forcing is then carried downwind. There it mixes with cooler (or warmer) air. Cooler (or warmer) air upwind of the regional forcing will also be carried down into hte area of the forcing. The consequence is that the temperature effect of the forcing is more dispersed than the forcing. That is, you have two stages of dispersion. In the first, the aerosol becomes more dispersed than its source; and in the second stage the temperature effect of the aerosol becomes more dispersed (and diffuse) than its source.
Chriskoz (@29) was referring to the later effect. That effect is purely a funtion of surface winds because it is the surface air temperature we are discussing. The more complicated case with the dispersion of aerosols has already been discussed above, and is a seperate issue. Your confusing of the issue looks like your trying to have two bites of the cherry. Having been comprehensively refuted on aerosol dispersion above, you appear to argue aerosol dispersion must be greater than observed, and more favourable to your case than is observed because of some effect of wind which is in addition to the observed dispersion of aerosols.
Second:
"Looking at the Bejing/Shanghai zone, it can be boxed by 110 to 122.5 and 27.5 to 42.5."
Seriously?
After all the discussion above, your just going to exclude Chengdu (104 E) from consideration, even though it is the only area to have red or greater aerosol concentrations year round in China; and restrict yourself to the Peking/Shanghai corridor despite the fact that for half the year it shows yellow or less aerosol concentration; and just totally ignore the temperature dispersion from prevailing winds even though you (following Chriskoz) brought it up?
Your new region of choice is a blatant cherry pick that simply ignores the prior discussion. Having been shown wrong on almost every point you simply attempt to start the argument again showing that you have learnt nothing, and that it is a waste of time continuing the discussion with you.
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scaddenp at 13:42 PM on 20 May 201497% - A Statistically Representative Debate On Global Warming
Terranova, perhaps the best way (often used and I should have done it too), is to respond in the appropriate thread, and then post a pointer to response in the originating thread. At the top of a comment, is a link with the date. Copy this link and then use as a referrer.
In those appropriate places, by all means give us examples of "over the top" predictions in papers or IPCC reports; and also evidence that we see now is part of natural cycle. Use the search function at the top to find appropriate threads.
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Klapper at 12:24 PM on 20 May 2014Sense and climate sensitivity – more evidence we're in for a hot future
@Tom Curtis #37:
I disagree with your surface winds argument. Aerosols don't just hang close to the ground and their forcing is not just at ground level, it's all the way up the atmospheric column as volcanic episodes show. Your AOD map in post 34 shows dispersion to the NE, out over the Pacific, which is the direction of the prevailing winds on the maps I found and which you noted in your post 32.
Your PM2.5 map in post 28 shows the aerosol maximums in the Bejing/Shanghai corridor. I think you would agree to this? Also in post 28 the warming map for China in this same area shows "red", in the range of 0.4 to 0.6C, although I'm not sure over what time period this is.
Looking at the Bejing/Shanghai zone, it can be boxed by 110 to 122.5 and 27.5 to 42.5. If you take a land only dataset (I choose CRUTEM4.2 since the grid is 2.5 degrees not 5), the warming rate in this area is 0.30C/decade for the last 30 years. For the global land CRUTEM4 shows 0.28C/decade.
So the most aerosol polluted geographic area on the planet is warming slightly faster than the globe. Again I ask the question: how do you reconcile this basic fact with the interpretation that anthropogenic aerosols are a negative (cooling) forcing?
You are right that
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