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Eric the Red at 04:13 AM on 22 June 2011Infographic: 97 out of 100 climate experts think humans are causing global warming
I will try again, since the moderater insists it will work. The studies do not suggest thatthe values are centered close to 3. In fact, they suggest the opposite. Models show clustering around three, will paleo data consistently shows higher values with temperature data showing lower. There are several clusters of estimates, without a smooth distribution. KR linked to a nice series of climate sensitivity papers. So far, I have only read through the first two pages. Some papers show higher climate sensitivity ranges; Sanderson 2.45 - 7.32 and Hergerl 1.5 - 6.2, while others show lower; Schneider 1.08 - 2.3 and Padilla 1 - 3.2 (do not ask me how anyone can list three sig. figs. in their determinations). Risk analysis may be fine for policy makers and insurance agents, but makes for poor scientific study. I would not advise anyone to accept a mean value (3.0) or median value (2.6 or 2.8) in making decisions when such a wide range exists. It may be a good starting point, but one should realize that it could be off by a large amount. I do nto know why politicians should bet on low, high, or mid-range cliamte sensitivity values, as they all have a high probability of being wrong. -
Rob Honeycutt at 04:10 AM on 22 June 2011IPCC Report on Renewable Energy
Dana... But that whole equation is supposed to flip sometime in the next decade, right? I keep reading that PVs are projected to fall below the cost of coal this coming decade, even without subsidies. -
dana1981 at 04:04 AM on 22 June 2011IPCC Report on Renewable Energy
luminous - that's a bit of a tricky question, because it depends what you're factoring into the price of a new coal plant. In this post I mentioned the true cost of coal power - in short, the market price is cheap because it doesn't reflect the costs of the climate change and impacts on public health (which economists call "externalities"). If you don't include those external costs, coal is cheaper than most renewable energy sources (onshore wind is close). If you do include those external costs, most renewable sources are already cheaper than new coal plants. Putting a price on carbon emissions would be a major step in making the market price of coal more accurately reflect its true cost. Basically in the real world, it's cheaper to replace old power plants with renewables. But in the current market, it's usually cheaper for an electric utility to replace them with new coal plants (or natural gas). Which is why so many of us (including most economists) are pushing for a price on carbon emissions. -
thepoodlebites at 03:59 AM on 22 June 2011How would a Solar Grand Minimum affect global warming?
I just read an interesting article in Scientific American, March 2011, A Shifting Band of Rain. There's a good reconstruction of the Northern Hemisphere temperature anomaly during the Little Ice Age, about -1.0 C cooler than present. Here's an interesting observation from the article, "when solar energy reaching the top of the atmosphere decreased by just two tenths of a percent for about 100 years, the ITCZ migrated south toward the equator by 500 kilometers." The prediction is another 500 kilometer migration to the north by 2,100, based on projections from increased GHG. This prediction is pretty bold considering that the ITCZ is about where it was during the Medieval Warm Period. -
Eric the Red at 03:55 AM on 22 June 2011Websites for Watching the Arctic Sea Ice Melt
Nice graphic. The melt pool may not be significant as the sea ice extent is essential the same as last year.Moderator Response: (DB) The volume is what matters; by melt season's end, 2007 will fall. -
KR at 03:53 AM on 22 June 2011McManufactured Controversy
While generally rather ignorant of Australian politics, it's my understanding that they are ramping up to vote on a carbon tax. This would be a significant move towards controlling CO2 emissions - a major country investing in controlling their GHG footprint. Given that, it's not all that surprising that various "skeptic" sources are ranting loudly; JoNova, Watts, assorted 'Business as Usual' associated mouthpieces, etc. While not confident about it, I'm hopeful that the increasing rant level, decreasing rationality of objections, and yelling about such terribly minor issues as the authorship of this peer reviewed article indicate that the deniers are beginning to run out of steam. They can still do a lot of damage in the political arena, but I believe it's becoming more and more obvious to the public that their objections are, to a great extent, hollow shells... -
Paul Magnus at 03:49 AM on 22 June 2011Climate Change Denial book now available!
This use to be available as a pdf download right? where is that gone? I have been waiting for this on kindle but it is taking ages. Why is it so many environmental books dont come out on ebook for right away? -
dhogaza at 03:45 AM on 22 June 2011McManufactured Controversy
Keith Kloor's not fit to wipe Revkin's shoes, in terms of influence, so I didn't bother mentioning him. I think Revkin's definitely worth pointing out, though, since he's possibly the most prominent NY Times voice on climate change issues and has a long standing track record of using folks like RPJr as his go-to source on the science (rather than, well, climate scientists).That's how the integrity of the attacks is being presented: one possible flaw, even though tiny and not central to the findings, is cast as evidence that the entire document is fatally flawed.
Not just the document, but the entire IPCC. That's what they're after, bringing down the IPCC. Never mind that WG3 is much less rigorous than the most important working group, WG1, which analyzes and summarizes the state of the science. If you can undercut one group's work, even a small part of it, even on points which have no merit, you can undercut the entire process or even kill it entirely. -
actually thoughtful at 03:43 AM on 22 June 2011Linking Extreme Weather and Global Warming
It is a small point, but part of the rise in insurance claims is a trend (in the US at least) for increased population densities where climate change driven disaster is likely (and, per Tom Curtis, that is everywhere), specifically the forest urban boundary in the West/Southwest, along rivers, and along shorelines. However, this trend is minor compared to the impact of increased energy and moisture in storms. I appreciated the idea that the lower differential in temperatures that global warming brings should translate to weaker storms, but the observable reality (see Tom Curtis at 116) actually indicates the opposite. -
NewYorkJ at 03:42 AM on 22 June 2011McManufactured Controversy
dhogaza: "The very URL exposes his error: "new-ipcc-error-renewables-report-conclusion-was-dictated-by-greenpeace" DSL: "Further, he has, like Watts, allowed his comment stream to fill up with garbage and shown an unwillingness to address the garbage." Lynas has also shown an unwillingness to address critique of his arguments. I tried multiple times to point out the obvious problem with the headline (that dhogaza linked to) and other arguments on his blog, but to no avail. Then he comes back with the "circle the wagons" response to characterize anyone dissenting from his argument. End of discussion. Minor issue with Dana's point: "And unfortunately, a few other influential figures (i.e. Mark Lynas and Anthony Watts) have bought into McIntyre's glaring logical fallacy." Watts would predictably buy anything that bashes the IPCC, so that's not a matter of chance.Response:[dana1981] Agreed re Watts, but it's still unfortunate
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KR at 03:42 AM on 22 June 2011When scientists take to the streets it’s time to listen up
Eric the Red - While a few "test" posts appear to have been deleted, I don't see any of your posts with content that have been removed. Certainly there don't seem to be any posts containing examples of misrepresented papers (as you claimed earlier), as per dhogaza's or my questions, that have been deleted. But I'm not a moderator, perhaps I've missed something. I would suggest (re)posting your examples, paying attention to the Comments Policy while doing so.Response:[DB] You are correct, on all counts. You haven't missed anything, O' Sharp of Eye.
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luminous beauty at 03:37 AM on 22 June 2011IPCC Report on Renewable Energy
A question that always arises in my mind is: What is the difference in the investment cost of renewables and the investment cost in replacing existing fossil energy plants, plus the infrastructure that supports them, as their economic lifetime expires? I hardly ever see this addressed except that renewable plant costs are, in general, going down and fossil plant costs are going up. I also note that the geothermal sources are conservative low hanging fruit estimates compared to the MIT study that gives estimates of 14,000ZJ, 200ZJ - 2000ZJ potentially extractable, for just the continental US. To coin a phrase; What's Up With That? -
dana1981 at 03:36 AM on 22 June 2011IPCC Report on Renewable Energy
Lynas has not raised any substantive criticisms of the report. He's unhappy that the 77% plan phases out nuclear power, but that's neither here nor there - the plan is both technically and economically feasible. As Rob suggests, to discuss the manufactured controversy and ad hominem attacks, please see the sister post linked at the end of this article. -
dana1981 at 03:31 AM on 22 June 2011McManufactured Controversy
Eric #1 - it's pretty clear that McIntyre has been the leader of this manufactured controversy, and Lynas jumped on his bandwagon, though he may have taken it further. dhogaza - true, Revkin's initial reporting on the subject was quite poor. If we were making a list, we could also include Keith Kloor, from what I've heard (I haven't visited his site recently). But I didn't intend to make a list, just to provide a few examples of poor vs. good coverage of the subject. And it's certainly not even remotely true that Greenpeace dictated the conclusion of the report. -
DSL at 03:27 AM on 22 June 2011McManufactured Controversy
Eric, Lynas has echoed the sensationalism--indeed, I might say alarmism--of McIntyre. Further, he has, like Watts, allowed his comment stream to fill up with garbage and shown an unwillingness to address the garbage. When the larger context is understood--as dana points out--then the strong reaction to it ("more of the hoax!") appears not only uncritical but a little insidious. We might use the analogy of the dam here: critics are looking for the slightest, tiniest crack in the dam, because small cracks can become large cracks and lead to the complete failure of the dam (AGW). That's how the integrity of the attacks is being presented: one possible flaw, even though tiny and not central to the findings, is cast as evidence that the entire document is fatally flawed. Yet the IPCC report is not a dam. It is more like a forest. Teske et al. (2010) was peer reviewed, but if it still represents a conflict of interest, if you think (without evidence presented ("exposing the conflicts")) that it's still a flaw in the process, then it is a tiny flaw--one plant in the forest. If the plant dies, the forest still lives (indeed, it grows stronger on the decomposition of that plant). It's rather more interesting that McIntyre, Watts, and their comment-bots need to seize upon and seriously misrepresent this rather insignificant element of the report. Given the context, it doesn't just suggest desperation; it is desperate. -
dhogaza at 03:16 AM on 22 June 2011McManufactured Controversy
"I would suggest reading the full article before posting" It would be nice, wouldn't it? Just as it would've been nice if Revkin had read the report he was criticizing before jumping on the "IPCC == greenpeace == evil" bandwagon. -
dhogaza at 03:15 AM on 22 June 2011McManufactured Controversy
I would say that Mark Lynas is full of it. The very URL exposes his error: "new-ipcc-error-renewables-report-conclusion-was-dictated-by-greenpeace" That's simply a lie, pure and simple. So is his claim that the peer-reviewed paper in question is "grey literature". That's just bullshit. In essence he says "I don't like the journal, therefore IMO it's grey literature". -
Rob Honeycutt at 03:14 AM on 22 June 2011McManufactured Controversy
Eric... I would suggest reading the full article before posting. The link you're providing is already provided in the body of the article. -
dhogaza at 03:13 AM on 22 June 2011McManufactured Controversy
You might want to add Andy Revkin (who runs the DotEarth blog for the NY Times) to your list of sinners. "Now, it may be argued that the 77% goal is not politically realistic, but the IPCC report did not and cannot evaluate political feasibility." He fails to make that distinction and it's clear that he didn't bother to read the report before jumping on the bandwagon because he stated that the report ignored the magnitude of the investment cost that would be required if that goal were to be met. His error was pointed out to him in the comments, and he amended it, but it's the kind of error that only gets made if you've not read the report you're criticizing ... -
Eric the Red at 03:03 AM on 22 June 2011McManufactured Controversy
I would say that Mark Lynas has been the leader in exposing the conflicts. http://www.marklynas.org/2011/06/new-ipcc-error-renewables-report-conclusion-was-dictated-by-greenpeace/ -
Eric the Red at 03:01 AM on 22 June 2011How would a Solar Grand Minimum affect global warming?
There is no current participation because my last three attempts have not registered.Moderator Response: (DB) Posting a comment with the sole word "Test" in it did not constitute a comment with any substance, so it was deleted. -
Eric the Red at 02:58 AM on 22 June 2011When scientists take to the streets it’s time to listen up
dhogaza, You must have missed it. Maybe KR say it before it was deleted. -
Rob Honeycutt at 02:54 AM on 22 June 2011IPCC Report on Renewable Energy
Eric... This is already being discussed here. -
Eric the Red at 02:51 AM on 22 June 2011IPCC Report on Renewable Energy
Not everyone seems to think this report is accurate or even good science. http://www.marklynas.org/2011/06/new-ipcc-error-renewables-report-conclusion-was-dictated-by-greenpeace/ http://www.marklynas.org/2011/06/new-allegation-of-ipcc-renewables-report-bias/ -
KR at 02:05 AM on 22 June 2011Infographic: 97 out of 100 climate experts think humans are causing global warming
Eric the Red - Tom Curtis is quite correct. The recent instrumental estimates have a larger spread, and generally lower values, but are only capable of measuring the climate change that occurs in short time periods. Therefore they have a tendency to underestimate longer term climate sensitivity. When you have multiple independent measurements (as is the case here, as various paleo measures, modellings, and recent instrumental work are using different inputs) that each produce a similar spread of uncertainties, the uncertainty is reduced with each estimate, not amplified. The median values are tightly clustered around 3ºC. Probabilities of significantly lower or significantly higher values for climate sensitivity are extremely small. So, Eric, this makes me rather curious. You've essentially asserted (repeatedly) that we are not certain, and that more study is required. The evidence says otherwise. Why should we (in a risk management sense) not act upon the data we have? Your attitude strikes me as a "Yes, but..." form of denial, and in particular of delay of action. -
Miriam O'Brien (Sou) at 01:42 AM on 22 June 2011When scientists take to the streets it’s time to listen up
Oh yes, I often witness deniers making up stuff and qualifying it with 'it's just my opinion' - or 'I seem to recall' - and never backing up the falsehood with evidence, obviously, because they can't. (I've been the target of such attacks myself for being an 'alarmist'.) It's a widely used tactic and I usually make the effort to counter it, because it's worth it even though it's tedious. (Same thing happens with gossipers - it's a tried and true technique throughout time immemorial probably, to start a rumour and then say 'no smoke without fire' - even though the gossiper was the one that made the smoke in the first place.) -
Albatross at 01:37 AM on 22 June 2011How would a Solar Grand Minimum affect global warming?
Sorry, messed up the RealClimate link. This should work. They also link to a previous paper (Wigley et al. 1990) that is consistent with their findings. If a Maunder-like minimum comes to pass it is not going to be the silver bullet that some hope for, we still urgently need to start reducing our GHG emissions. -
Tom Curtis at 01:22 AM on 22 June 2011Infographic: 97 out of 100 climate experts think humans are causing global warming
Eric the Red @203: First, the following are the climate sensitivity studies analysed in AR4:
The triangles represent the most probable individual value on each Probability Density Function, but the important value, the median shown by a circle, is the value such that there is an equal probability that the true value will be above that point, or below it, given the evidence in the study. It is quite clear that for 11 out of 15 studies with a displayed median, the median is very close (within 0.5 degrees) of 3 degrees. Only one study, Andronova 2001, shows a median more than 1 degree from 3 degrees.
It is, therefore, quite plain that combining the evidence from these separate studies will result in a median close to 3. In fact, this can be seen graphically by the region in which the curves for the cumulative probability intersect:
The large spread of the red curves, estimates based on 20th Century data, show such estimates to be very unreliable - primarily because temperatures do not reach equilibrium which introduces an additional source of uncertainty compared to paleo studies.
Given this data from the IPCC, I would say your contention of wide divergence is refuted unless you can show such a wide divergence in more recent studies. Please not that because of the various shapes of the PDFs, giving confidence intervals does not provide us with enough information. We need to know the median values of the PDF for each estimate.
Second, I note that the marking feature of climate change deniers is that that all agree that we should take no expensive action against the threat of global warming. They may claim that the evidence is clear that there is no threat; or they may claim that the evidence is unclear and that therefore we should take no action. The former have at least the advantage that their position is rational, though it is flatly contradicted by the evidence. The later have neither the advantages of evidential support nor a rational position.
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Eric the Red at 01:13 AM on 22 June 2011How would a Solar Grand Minimum affect global warming?
Tom, KR, Albatross, The 97 / 100 thread seems to have gone dead.Response:[DB] There are no dead or closed thread posts here at Skeptical Science, just some with no current participation.
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Eric the Red at 01:11 AM on 22 June 2011How would a Solar Grand Minimum affect global warming?
The discussion on RC has linked to some earlier papers whcih described the potential for a solar minimum. http://www.schulphysik.de/klima/landscheidt/iceage.htm http://sesfoundation.org/dalton_minimum.pdf -
Utahn at 01:04 AM on 22 June 2011Australia’s contribution matters: why we can’t ignore our climate responsibilities
"The view that one country’s actions have no effect on other countries is present in all but the largest countries, " Ridiculously, even here in the USA, it's "it won't matter because of India and China"... -
Albatross at 01:00 AM on 22 June 2011Linking Extreme Weather and Global Warming
JMurphy and Tom Curtis, The Munch Re have their 2010 report available online. You can download it here. From the report: "We need look no further than this past year for evidence showing that climate change is real and continuing. The year 2010 sets the trend towards ever warmer years and an ever decreasing ice cover in the Arctic Ocean. Globally it was one of the warmest years since records began 130 years ago. The ice cover during the annual minimum in September was the third-lowest, reaching an absolute minimum for the month of June. Data collected by Munich Re also show that (after 2007) 2010 brought the second highest number of loss related weather catastrophes since 1980, when our data series began." -
Albatross at 00:58 AM on 22 June 2011Linking Extreme Weather and Global Warming
Tom @116, I have to agree with Actually Thoughtful @126. Great post, sad that its contents and message are lost on some. -
Albatross at 00:54 AM on 22 June 2011How would a Solar Grand Minimum affect global warming?
RealCimate has a post on the kerfuffel surrounding the statements made during the meeting of the Solar Physics Division. It is still not clear what Ken is trying to get at, other than perhaps to fabricate debate and muddy the waters. The post is about the ludicrous claims that the denialosphere (including some media outlets) and "skeptic" spin machine have made concerning the possibility that the sun could enter a Maunder-like minimum around 2020. It also presents the findings of research undertaken to address just such a question/scenario. Does Ken think that should the sun enter a Maunder-like minimum that we will enter a period of global cooling or another Little Ice age? If he broadly accepts the paper's findings then we are all mostly in agreement, his arguments are largely moot. If he disagrees, then he seems to be of the opinion that we are in for a period of prolonged global cooling. Or it might be something in between, in which case I look forward to his paper quantifying how much he thinks a Maunder-like minimum might affect global temperatures. Which is it? Because this bickering and pontificating and arguing in circles is getting very annoying. I might suggest Ken goes and tries to argue his points with the authors at RealClimate. -
Tom Curtis at 00:19 AM on 22 June 2011How would a Solar Grand Minimum affect global warming?
Ken Lambert @75, given that you now show every evidence of understanding the difference in uncertainty for absolute measurements of TSI and for relative TSI (ie, change of TSI with time), I am now at a complete loss to explain why you should quote the irrelevant uncertainty for absolute measurements rather than the directly relevant uncertainties for relative TSI when attempting to rebut KR #62. -
JMurphy at 00:05 AM on 22 June 2011Linking Extreme Weather and Global Warming
More information (from Oxfam) on 'extreme weather events', going back to 1980 : There is a statistically significant increase in all disasters, and this trend is driven mainly by a rising number of floods in all regions and by more storm events in Asia and the Americas. Changes in population do not fully explain the rising number of floods, nor can the trend be entirely attributed to changes in how disasters are recorded. It was not possible to directly analyse the effect of climate change on disaster trends; however, there is insufficient evidence to exclude the possibility that climate change is increasing hazards and hence trends in reported disasters. This effect is unlikely to be very large, because the magnitude of climate change over the past 20-30 years is relatively small when compared with (for example) the growth in the world’s population over that time. Trends in the number of reported natural disasters -
Bob Lacatena at 23:47 PM on 21 June 2011Infographic: 97 out of 100 climate experts think humans are causing global warming
203, Eric the Red,There are clusters of values depending on the method used; models tend to yield higher values, temperature data lower, etc., resulting in several peaks within the distribution.
I don't see this statement to be at all true, and I'm afraid I must challenge its veracity. Can you back it up by listing the studies that you believe find a most likely value for climate sensitivity of less than two, versus those greater than two? This sort of anecdotal contention, which is so at odds with everything that I myself have read, requires supporting evidence. -
Bob Lacatena at 23:41 PM on 21 June 2011Infographic: 97 out of 100 climate experts think humans are causing global warming
203, Eric the Red,Risk management may be fine for politicians and insurance agents, but is fruitless in scientific work.
I think that this is the biggest point of contention for me. We're not talking about cold, pure science. We're not trying to discover the double helix, or riddle out quantum theory in a purely abstract detached-search-for-knowledge sense. Your (as in you, personally) understandings and decisions are going to affect the course of civilization. This is not abstract. This is not trivial. This is, in every sense of the word, risk management. It is one thing to arrive at a logically consistent conclusion that there is no risk. It is another to irrationally and arbitrarily minimize that risk, dismissing it as inconvenient. You be the judge of where you lie in that spectrum, but the mere fact that you don't even choose to recognize it as a risk management issue speaks volumes. -
skywatcher at 23:22 PM on 21 June 2011CO2 Currently Rising Faster Than The PETM Extinction Event
Jerry #63 - excellent comment, well worth reading thoroughly. Seeing as modern civilisation could be described as 'well adapted' to current conditions, and more critically, can be described as 'tightly tied' to current conditions, in terms of the locations of global agriculture, coastal cities etc. We don't have the luxury of the camels or primates of Jerry's example, where we can simply migrate ourselves and all our infrastructure and agricultural zones to somewhere more pleasant. Regrettably maybe we're more like the plesiodapids, except that perhaps we can do something about the CO2 emissions? -
Ken Lambert at 23:20 PM on 21 June 2011Australia’s contribution matters: why we can’t ignore our climate responsibilities
Quoting from the works of Ross Garnaut can be fraught with exaggeration and flawed logic: "Since it is not possible for Australia to be a leader in reducing greenhouse gas emissions because others are already too far ahead, we should do our fair share in what the world needs to do. Let us look forward to a future in which Australia is doing its fair share in a global effort" Who are the leaders in reducing Greenhouse gases in the world? France? with 80% nuclear power? Certainly not the major emitters - China, USA nor Europe! China is adding 10 times Australia's total coal fired electricity capacity over the next 10 years. In 2020 China will have 28 times Australa's total coal fired capacity - so a drop of 5% in Australia's emissions will be insignificant. The USA has no plan for a carbon tax or emissions trading scheme and none will be passed in the forseeable future. That accounts for the two countries with 40+% of the planet's carbon emissions. Now I know Australia is renowned for punching above its weight - but we are completely deluded if we export carbon emissions offshore in a vain attempt to have an effect on the rest of the planet. Our main natural advantages are cheap energy from coal, efficient agriculture via energy intensive cultivation, export of natural gas etc, and digging up red dirt. Kill off these industries with a unilateral carbon tax and face a popular revolt over the sharp drop in living standards from loss of our main exports. -
jerryd at 22:53 PM on 21 June 2011CO2 Currently Rising Faster Than The PETM Extinction Event
Regarding the above points, Abundant evidence suggests that a massive input of CO2 occurred during the onset of the PETM (this could include oxidation of CH4). There were no mass extinctions (except in many benthic foraminifera). HOWEVER, There were profound changes in the environment during the event. One only has to look at the sedimentary record. The PETM now has been clearly documented in about 150 locations from around the world (McInerney and Wing, Ann. Rev. Earth Sci., 2011, nicely show most of them on a map). At almost all these locations, the PETM is marked by an anomalous horizon. The lithological changes across the PETM relate to several factors. For example, in the deep-sea (>2000 m paleo-water depth), there is typically a drop in carbonate content caused by carbonate dissolution (aka ocean acidification). In several shallow marine sections, there is a black organic-rich shale, probably caused by enhanced runoff and water column stratification. There were also numerous prominent changes in biota. Indeed, this is why there exists an epoch boundary (i.e., the Paleocene/Eocene boundary) at the start of the event! Fro example, in Wyoming, the mammal fossils found before the event are completely different than the mammal fossils after the event. We don't really think of this as a mass extinction, though, because the number of orders does not drop precipitously. Instead, it is a wholesale migration (or perhaps even origination) of animals. So "fared well" depends on what you mean. Certainly, if you were a Plesiodapid living in Wyoming, the world was not a kind place; on the other hand, if you were a camel or a primate living somewhere unknown, Wyoming suddenly became the land of bounty. In any case, Rob's main point is entirely valid. In the last 65 million years, the PETM was by the most extreme short-term event associated with rapid warming and massive carbon input. It was marked by profound environmental changes. All indications are that carbon inputs are changing significantly faster at present-day than during the PETM. This has been spun in two different ways by many people: we're heading for catastrophe; things will be okay as Earth has been through this before. I'll just stick to the facts on this point, but note that, to suggest that changes will be minimal, is not consistent with the geological record. Jerry -
Ken Lambert at 22:44 PM on 21 June 2011How would a Solar Grand Minimum affect global warming?
Tom Curtis #72 Satellites are gererally thought to have high precision but low absolute accuracy. They can give good day to day, months to month or year to year variations - but not good absolute values. If the TSI from SORCE was an accurate absolute value then Dr Trenberth's energy balance diagram would need to be adjusted. The Incoming Solar Radiation would drop from 341W/sq.m to 340W/sq.m which would require re-adjustment of the outgoing longwave and reflection terms to give a +0.9W/sq.m warming imbalance. The SORCE people had a go at this re-balance here: http://lasp.colorado.edu/sorce/instruments/tim/tim_science.htm Whatever you can make of this Tom - it had Dr Trenberth rather puzzled. -
Eric the Red at 22:42 PM on 21 June 2011Infographic: 97 out of 100 climate experts think humans are causing global warming
Actually Tom, I find the opposite to be true. There are clusters of values depending on the method used; models tend to yield higher values, temperature data lower, etc., resulting in several peaks within the distribution. KR presented a nice listed of climate sensitivity studies in #188. Those that used primarily CO2 to determined climate sensitivity arrived at the highest values as the Sanderson paper had a range of 2.45 - 7.32 and Hergerl 1.5 - 6.2. Those that incorporated higher natural components arrived at much lower estimates; Schneider 1.08 - 2.3 and Harvey 1 - 2. In some of these studies the most likely value was less than 2, in other it was greater than 4. To accept a mean value at this point is unwarranted, as it has a high probability of being wrong by more than 0.5C. Risk management may be fine for politicians and insurance agents, but is fruitless in scientific work. I would advice politicians, or anyone else, to bet on any value for climate sensitivity, either high, low, or middle. -
Bern at 22:42 PM on 21 June 2011Australia’s contribution matters: why we can’t ignore our climate responsibilities
Dikran, that's a good image to use. I'll keep that in mind, next time I hear this argument. -
CBDunkerson at 21:57 PM on 21 June 2011Websites for Watching the Arctic Sea Ice Melt
Heh... was just on my way here to post that map les. Also an article on it here. The map you included above seems to show that the really thick sea ice (5 to 10 meters) which used to cover a large portion of the Arctic ocean is essentially gone (just a few scattered dots of 5 meter ice) and most of the remainder is 3 meters or less. This doesn't seem radically different from past estimates so I suspect the PIOMAS volume values have been in the right ballpark. The article above also has an interesting ice thickness graphic for Antarctica. Looks like they are going to start their data record from January 2011. They launched in April 2010, but presumably they don't want to use data from the calibration and early validation period so 1/1/11 is a good start point. They've been validating the satellite readings against plane and ground measurements and have completed that through February. Will likely continue validation for several more months before releasing satellite results without extensive cross-checking. -
Bob Lacatena at 21:42 PM on 21 June 2011Websites for Watching the Arctic Sea Ice Melt
As a side note, melt pools first appeared this year on North Pole Web Cam 1 on 6/19 about a week ahead of last year (6/25). -
les at 21:24 PM on 21 June 2011Websites for Watching the Arctic Sea Ice Melt
33,35,65... Cryosat-2 just around the corner!
I share your excitement - not least because I used to work with some of the team on envisat... evil bastards, working to become millionaris using this stuff to take over the world via the UN on the back of the scam known as AGWgreat scientists, thrilled for them. -
Norman at 20:58 PM on 21 June 2011Linking Extreme Weather and Global Warming
Tom Curtis @ 129 I did look at the third graph and went to the web site it came from. This chart does show an increase in frequency of catastropic events related to weather but I can't find supporting documentation to interpret the information. What do they mean by catostrophic, how do they define the events, what are they looking at. It looks like an insurance company put this out so is it dollar value related? If I have more information on what the graph means it could be a strong point in showing an increase in frequency of extreme events. -
Anne-Marie Blackburn at 20:55 PM on 21 June 2011Introducing the Skeptical Science team
Quality not quantity, Hoskibui ;) -
Rob Painting at 20:05 PM on 21 June 2011CO2 Currently Rising Faster Than The PETM Extinction Event
Arkadiusz - "conclusion that nature has "fared" surprisingly well during the PETM of ocean acidification and warming" Yes, but the current rate of ocean acidification is unprecedented in the last 65 million years. In fact, if the PETM carbon is from methane, acidification could be happening around 27 times faster today than during the PETM. Additionally, during the PETM ancient corals appeared to cop a bit of a hammering from bleaching events. Links for peer-reviewed papers, supporting these claims, are in the post. A global civilization did not exist during the PETM, but if it did, how do you think they would have fared given even that slow rate of change?
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