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All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.

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Comments 73201 to 73250:

  1. Increasing CO2 has little to no effect
    alleycat#91: "So even if it is 'man made' it's still 100% natural. " What a useless tautology. Cars are man-made and are therefore 100% natural (by your 'logic'). Yet there are laws to control the use of cars. Should nature just self-correct wayward drivers? Volcanoes? Biggest in recent memory was Pinatubo and it did have an effect on climate - for about 2 years. So? You can learn something about the science here. Thus far your claims (such as 'volcanoes emit more CO2') have all been factually incorrect and everyone commenting has politely told you so -- with references. No one is name-calling and demonizing; the first to accuse another of doing that is usually the one who has lost the argument. If you find it necessary to go that path, you'll find the moderators will quickly show you the door.
  2. Pielke Sr. and SkS Disagreements and Open Questions
    The image is now broken for me, I'm afraid. I've moved it to an image host with which I've got more experience: I've had a quick look into the TCR (transient response) question. The TCR for modelE is 1.5-1.6, which accounts for the difference in results. My empirical value is very similar, but then I use the GISS forcings. This report says "The full range for TCR in the CMIP3 archive is 1.3 to 2.6°C, with a median of 1.6°C and 25 to 75% quartiles of 1.5 to 2.0°C (Randall et al. 2007). Systematic exploration of model input parameters in one Hadley Centre model gives a range of 1.5 to 2.6°C (Collins, M., et al. 2006).". Which is somewhat ambivalent. Dana's method of scaling the TCR happens to give almost exactly the right answer for any given climate sensitivity. Why? Because as it happens the CO2 forcing has increased pretty linearly over the past 40 years (not shown), and the gradient when projected back crosses the zero line about 70 years ago. So we've effectively lived through a TCR experiment scaled down by a factor of 2, and the resultant temperature rise due to CO2 alone is thus also half of TCR. The only question is what is the correct value for TCR: 1.6 or 2.0°C? GISS modelE and most of the CMIP3 models are around the lower end. However more recently Tung at U.Wash has argued for significantly higher values from solar cycle data.
  3. The Deep Ocean Warms When Global Surface Temperatures Stall
    Tom @32, We cross posted. You of course make a very valid point about oceanic heat content and sea surface temperatures. Someone seems to be intent on arguing strawmen.
  4. The Deep Ocean Warms When Global Surface Temperatures Stall
    Micawbr, I'm sorry but you are saying an awful lot without really saying anything substantive, and are not raising issues that have not already been dealt with in the literature. I encourage you to read Lau and Weng (1999), AchutaRao et al. (2007), Lyman and Johnson (2008), Domingues et al. (2008), Levitus et al. (2009), or DelSole et al. (2011). These papers deal with the sampling and instrument issues, and they all note that decadal variability is evident in the ocean SSTs and OHC. What scientists are now interesting in determining is what exactly is happening during hiatus periods, and models are a very useful tools for such experiments/investigations. "I personally do not consider the periods before [1995] then to be valid until I see proof of the input data." That is your opinion and not that of the scientists who work in the field. As for the reliability of the early OHC data, Lyman and Johnson (2008) conclude: "From 1955 to 1966, in situ ocean sampling is inadequate to estimate accurately annual global integrals of the proxy upper OHCA. During this period, the SI for the sampling pattern of any given year underestimates the 13-yr trend in proxy OHCA from 1993 to 2006 by around 70%, and confidence limits for the WI are often very large. From 1967 to 2003 there appear to be sufficient data to estimate annual global integrals. " So we can perhaps agree that one should be looking at data since ~1967 and not 1955. The hiatus periods identified by Rob Painting include that interval of what is deemed to include reliable data. More information on the various OHC chronologies can be found here But if you wish to insist that the data are not reliable prior to 1993, then also consider Willis et al. (2004) and Lyman et al. (2010). Both these papers show robust warming of the oceans between 1993 and 2003 and between 1993 and 2008, respectively. You claim "Argo floats switch off near the surface and in any case only operate in deep waters". That is not an accurate description. There are two standard mission operations: "In the simple mission, the float descends to a certain depth, often 2000m, and then begins its temperature and salinity profile from that depth. In the park and profile mission, the float descends to a certain depth, 1000m is recommended, and then descends to 2000m to start the temperature and salinity profile. In the beginning of 2010, 70% of floats profile to depths greater than 1500m. Another 20% profile to between 1000 and 1500m."
  5. The Deep Ocean Warms When Global Surface Temperatures Stall
    Micawber @31, ocean heat content measurements and SST measurements are not the same thing. Therefore your issue about buckets and intakes is a non-issue with regard to ocean heat content. Further, there have been frequent studies of the influence on various measurement techniques on the SST record, including: Jones and Briffa, 1992 Parker et al, 1995 Folland and Parker, 1995 Casey et al, 1999 Rayner et al, 2003 Rayner et al, 2006 Thompson et al, 2008 and Casey et al, 2010
  6. Increasing CO2 has little to no effect
    Alleycat @91:
    "Name calling and demonizing someone because they don't agree with your 'deeply held beliefs' is the first sign that you've lost the argument. "
    Actually, claiming somebody has lost the argument based on some trivia entirely unrelated to the science is a fairly sure sign that you have no substantive argument to offer. As an aside, the whole "global warming"/"climate change" issue is a complete non-issue that just makes you look silly (watch the video - you'll know what I mean).
  7. The Last Interglacial Part Four - Oceanic Influences
    There was an excellent example of the jet stream loop in the north Atlantic at the beginning of October 2011. It could be seen on some weather charts looping up the western side of the Azores high and the eastern side of the Iceland low. This brought unusually high temperatures to northern Europe and southern UK while Northern Ireland and central Scotland had cloudy, warm frontal conditions. Now the jet stream has resumed its West-East flow and normal westerlies bring temperatures more usual for this time of year. One would think a large volume of warm salty water was transported northward during the period. Thank you for a great explanation of the conditions applicable during these transitions. Is there a site where real time jet streams can be found. I currently use ugrib weather that shows isobars and rain. Jet stream has to be inferred.
  8. It's ozone
    Shibui, The reason for the colder stratosphere is a somewhat grey area ... The abnormally cold arctic stratosphere this spring is attributed to a lack of polar vortex disruption (which is turn is a result of weak planetary waves). The strong vortex keeps the arctic stratospheric air isolated, allowing it to cool sufficiently to form clouds. As the stratosphere continues to cool due to an increase in green house gas, it'll be interesting to see if this occurs more frequently.
  9. Increasing CO2 has little to no effect
    Alleycat, Your understanding of climate science is deeply flawed. The shift to the term "climate change" because the effect of global warming goes far beyond a simple increase in temperature. It affects rainfall pattern, ocean acidity etc. Global warming is the cause, climate change are the symptoms. No working climatologist believes that we are heading into an ice age. Global warming theory came long before the first computer arrive, and the theory have been verified through multiple observations and experiments. None of the 10 fingerprints albatross cited requires the use of a computer model. Computer models themselves are tested continuously against observations to ensure that the physics are captured correctly. You should also check out How reliable are climate models? Your belief that Volcano emits more CO2 is flat out wrong, as Dikran pointed out.
  10. The Deep Ocean Warms When Global Surface Temperatures Stall
    Michael Sweet@27 “The issues with sea temperatures that you point out are well known. The scientists involved try to adjust the data to correct the problems. Are you suggesting that we should wait until "someone" decides to fund much improved ocean sampling before we attempt to model anything?” What first alarmed me was the graphic at the beginning of the post. “Ocean Heat Content 1955 – 2008”. From 1955-1995 WMO VOS obtained surface seawater temperature (SST) by methods which changed from hand sampled buckets to seawater engine intake temperatures to satellite IR. Method changes occurred at different times for ships of different nations. I believe UK ships used bucket methods longest and even designed their own meteorological bucket. Corrections were made, the most drastic of which were during the two transition periods. Original raw observation data are not always available to go back and look at. As far as I can research, there have been no published scientific studies of either bucket or seawater intake corrections and their proven validity. That applies to corrections for supposed, but not proven, evaporative cooling of buckets on deck and engine room warming of intake seawater. As I originally pointed out, the physics for the latter is wrong. If heat flowed from a hot room into room radiators/convectors we would use them for central cooling not central heating. Seawater intake piping is generally not a good heat absorber being short, cylindrical metal pipes with fast flowing water. Moreover since seawater intake temperatures were measured at an unknown depth and, like bucket temperatures, were made by un-paid, unsupervised, non scientists with uncalibrated instruments, I am very skeptical of the validity of that data for the period 1955-1995. I spoken to people who were volunteers on merchant ships who confirmed that methods were very sloppy because they got no feedback. I am a physicist with experience in meteorology and oceanography and in instrument design, deployment at sea, data analysis and modelling so I am well aware of both the need for models to run with Navier-Stokes equations correctly accounting for the physics and with the most reliable input data. If you know SST corrections applied in the critical period and have examined the raw data together with the depth of the samples, then I would be very glad to see it. The published data rely on statistics rather than examining actual raw data in detail. Until the raw data and corrections applied become available I remain skeptical of data for the period. Data were derived by climatologists for use in climate models. The last seagoing meteorologist I could find in the literature conducted bucket measurements in 1926. Oceanographic data by seagoing oceanographers were taken in the deep sea and did not sample the near-surface layer as I stated (even along Line P). I am aware there are attempts to build surface sampling Argo floats but that only addresses part of the problem. Has there been any follow-up to the extensive Soviet near-surface work on gradients I cited? In short, your graph 1955-2008, can only be considered in the period 1995-2008 when satellite, ship, buoy and float data became available. I personally do not consider the periods before then to be valid until I see proof of the input data. So the answer to your questions is Yes, use only the most reliable data for models and that comes after 1995 not before. Rob Painting@30. I am sorry you do not understand my comment on the upper 50m. I understand that STD casts take at 3m and 10m sample depth at best and current generation Argo floats switch off near the surface to avoid contaminating sensors. Vertical exchange near the surface due to diurnal and seasonal heating and cooling are an interesting and important component of ocean heat budget. I eagerly await your post on the surface layer exchange.
  11. Michaels Mischief #3: Warming Island
    skywatcher - Sorry, the two 'places' weren't meant to imply the same location. All the instances I know where glaciers are advancing are likely caused by increased precipitation due to warmer conditions. There is a post titled Speculative polar cartography that's just gone up on RC.
  12. Increasing CO2 has little to no effect
    Albatross, NO ONE seems to understand the science behind climate change, not even the scientists who espouse it. Remember when you were all calling it 'Global Warming'? Now it's 'climate change' because you're all not sure if we'll end up with an ice age instead. A science that relies mostly on computer models as opposed to observation is completely flawed. If this was all so obvious, then the majority of scientists would concur, but they don't. muocounter, one volcano can throw out more CO2 and ash into the upper atmosphere than all the coal power plants on the planet combined. What are your plans to stop that? Outlaw volcanoes and undersea gas jets? The planet is a dynamic system that tends to correct itself. WE ARE A PART OF THAT SYSTEM, not some separate alien invader corrupting it. So even if it is 'man made' it's still 100% natural. The earth created us and it can destroy us just as easily. I'm fine with that, but you all seem to think you're some splendid shepherds of the planet, when in fact we're just another life form on it. Name calling and demonizing someone because they don't agree with your 'deeply held beliefs' is the first sign that you've lost the argument. [snip]
    Moderator Response: [Dikran Marsupial] Inflamatory comment deleted, please read the comments policy and make sure your posts conform to it more closely in future. We are very happy here to discuss the science with those who disagree with the mainstream poistion. However, it would be helpful if you were to first find out what the mainstream position is on the science, for instance volcanos do not produce more CO2 than anthropogenic emissions. Many of these facts can be easily checked by looking at the list of most used climate myths (on the left of the page), and then if in doubt, following the links given to the peer reviewed science. There is a possibility that you have been mislead, and some self-skepticism is a valuable quality in anyone wishing to discuss the science.

    By the way, understanding is not binary, there are issues in climatology that are very well understood, others where there is considerable uncertainty. This is much the same as in any other science. The use of computer models is not an indication that science is flawed. For example predicting planetary orbits into the distant future (i.e. astronomical timescales) is a special case of the n-body problem, which is analytically intractable, and as a result you need a computer to do the calculations. Does this mean that the science of planetary motion is flawed? Of course not. (note that the observations we have of planetary motion are the merest blink of an eye on astronomical timescales, so the science of planetary motion is no different from climatology from the point of use of observations).
  13. The Last Interglacial Part Four - Oceanic Influences
    muoncounter. Only within this context. What we can learn from the Last Interglacial time period. Understanding this period may provide clues on how the environment may respond to similar conditions in the future. Which leads me to believe that you actually agree with people like Monkton that the climate has a low sensitivity response because it has been that way in the past. I just cant see how we can use the past to assert such claims for the future. If you read my earlier posts and the replys to them you will be able to see how I arrived at this conclusion.
  14. Review of Rough Winds: Extreme Weather and Climate Change by James Powell
    Norman#178, While it may be possible to shrug off the 2003 European heat wave as 'just weather,' what about the 2006, 2007 and 2010 heat waves? FYI: here is the WMO definition of heat wave; others may have differences. Please avoid citing disinformation denial sites as 'references;' a practice that does little save damage your credibility.
  15. The Last Interglacial Part Four - Oceanic Influences
    FundMe#16: "today's world is so different in might as well be another planet" Please clarify this statement, with reference to supporting literature. As it is, it contradicts fundamental principles of sciences like geology, evolutionary biology, cosmology, certain aspects of physics and chemistry, etc.
  16. Climate Change Could be Expensive for Canada
    Bob, That is one of the unanswered questions. With projected temperatures to rise more in the winter than summer, the savings would likely outweigh the costs (a 10% savings in winter equals a doubling in summer). The link to the Regina hospitasl is broken, and apparently did not come close to any of the records. http://www.currentresults.com/Weather-Extremes/Canada/hottest.php I do not know the costs of upgrading either a heating or cooling system for a hospital or any other business. Another reason why this report contains too little information.
  17. Pielke Sr. and SkS Disagreements and Open Questions
    Here's my calculation of temperature due to CO2 forcing. The data is MLO from 1959, from here from 1832-1958. Forcing calculated as 3.7*log(co2/284)/log(2). Temperature response function calculated from (a) GISS model E forcings vs 20thC temps, (b) GISS model E forcings vs CMIP3 GISS model E ensemble average temperature. The temperature change estimate of 0.9C from CO2 alone in the article looks a touch on the high side. Why the difference? I get a slightly lower transient sensitivity than 2C/x2 for both the empirical and modelE cases. I think that's consistent with Hansen & Sato 2011 - I think the modelE response is slower some models, giving a lower ratio of transient to long term response. However, I haven't checked to see if they report a figure for transient response.
    Moderator Response:

    [mc] fixed image link

  18. Michaels Mischief #3: Warming Island
    Tom #44 well put, the idea of an advance in the 1960's and 1970's sufficient to cross a deep water albeit narrow strait is just not realistic. This would be a major advance for a small glacier like this. First it would have to thicken enough to remain and advance into the deeper water without simply calving more icebergs. There have been plenty of glaciers examined during this period in Greenland and this does not fit the pattern. Notice the Mittivakkat update from Mernild for 2011
  19. Eric (skeptic) at 21:34 PM on 5 October 2011
    GHG emission mitigation solutions - a challenge for the Right?
    Just a quick followup on Bob Inglis: he lost to the Tea Party in a primary last year and the baby went out with the bathwater. Although it's going to be difficult to turn the Tea Party back to the path of science, it's not impossible.
  20. Anne-Marie Blackburn at 21:30 PM on 5 October 2011
    Review of Rough Winds: Extreme Weather and Climate Change by James Powell
    Norman Yes, I recommend reading the US Climate Change Science Program report. I read it when it first came out - it's more technical than Powell's book and it may answer some of the questions you have. With regards to the European heat wave, I understand that anomalous meteorological conditions were the main cause of the event, but I don't see how, without a quantitative analysis, you can conclude that human-induced global warming did not contribute to the event. Nor can you state categorically, of course, that global warming did contribute to it. The take-away point from that section, according to Powell (based on Stott et al.'s paper), is that such heat waves become more probable in a warmer world. Which set the scene for the 2010 Russian heat wave, an event that was even more unusual than the 2003 European heat wave. I don't think cases should be taken in isolation though - it is the number of record-breaking high temperatures worldwide in recent years that make the case. I'm not sure what to say about your point on the lack of mechanism to explain more intense rainfall and drought. This is fairly well established in the literature. Would this article provide the information you need? Or am I misunderstanding your point?
  21. 2011 Sea Ice Minimum
    This image always amuses me, and it can be applied to any year which isn't a record : (Source)
  22. Michaels Mischief #3: Warming Island
    KR@27 You say;
    "There's definitely correlation of anomalies, as has been demonstrated over and over again. However, in this case, those stations are entirely too far to to judge the actual temperature. Anomalies correspond over great distances, but the offsets at each location are very much determined by local geography and weather patterns. An anomaly dataset from 800km just doesn't tell you what the offset at Warming Island would be."
    I'll be frank - I haven't read Pat Michaels article (please don't make me). But the correlation of anomalies is the point, not the absolute temperature. All that is needed is to show that 1957 was about as warm as 2005 at some station <1000kms from W. Island. Then it may be inferred that W. Island was as warm in 1957 as in 2005, and therefore W. Island was visible in 1957, and therefore recent warming is not unusual and Al Gore shops at Big Men. * This point is now moot. The counterargument based on nearer proxies and the lack of multi-annual warm temps in the 1950s (for equivalent melt) seems pretty strong to me. I appreciated the replies to my query, including yours, KR.
  23. Eric (skeptic) at 21:11 PM on 5 October 2011
    GHG emission mitigation solutions - a challenge for the Right?
    An article by former Rep Bob Inglis suggesting "accountable pricing": http://www.businessweek.com/news/2011-10-02/conservative-means-standing-with-science-on-climate-bob-inglis.html It makes political and scientific sense to attach a price for externalities to a fuel because then that narrows the arguments to how quickly to ramp up the price and how to reduce other taxes or rebate the emission tax (also note the not-to-subtle change from carbon tax to emission tax).
  24. SkS Weekly Digest #18
    Talking of cartoons, I see that WUWT have recently posted some, one of which shows their hero Monckton walking on water ! And so-called skeptics are usually the ones who claim that AGW is a religion and that those who accept it are religious followers, etc. ! How deep into denial can they be ?
  25. Between St. Roch and a cold place
    Thanks for all the positive feedback and comments so far. logicman's reference to submarines reminds me of another one (USS Skate 578), an unsubstantiated photo of which has been widely misused by so-called skeptics, e.g. at WUWT. As for the graph, obviously craft, equipment, gear, etc. are getting better all the time but conditions in the Northwest Passage are definitely allowing more craft the opportunity to make crossings anyway.
  26. The Last Interglacial Part Four - Oceanic Influences
    I should have phrased my last comment a lot better. The two concerns I mentioned were with reference to the past record and not today's world. As I tried to state today's world is so different in might as well be another planet. As we were discussing paleoclimate I just assumed it would be taken for read. 1)Did we have runaway Greenhouse effect leading to Venusian type conditions. 2)Did we have a cooling world leading to Ice ages. People like Monkton cant assume that because runaway greenhouse effect did not happen in the past it cant happen today as the conditions are completely different. There that is fixed.
  27. Between St. Roch and a cold place
    How remarkable that a graph of transits should so closely match everything else related to climate change, beginning roughly in the 1970s!
  28. It's ozone
    KR - Yes. Science of Doom concurs, but only just :)... http://scienceofdoom.com/2010/04/18/stratospheric-cooling/
  29. Between St. Roch and a cold place
    Excellent article: my compliments to JM. Additional info: In 1960, the Skate class submarine USS Seadragon sailed through the North West Passage. Before the 'skeptics' remember that event and start talking about underwater travel, I should explain the concept of 'squeeze'. A submarine traveling under ice is said to be squeezed if the depth of ice keels and the height of the ocean floor leave a gap too small for the sub to squeeze through. It is unlikely that ice conditions encountered by Seadragon in those relatively shallow waters were as bad as those encountered by St. Roch - but they were bad. St. Roch is famous enough to be available as a model kit. And no, I don't own shares in Billing Boats. :-)
  30. Understanding climate denial
    Thank you for your clarification (@139). (-Snip-).
    Response:

    [DB] Inflammatory tone snipped.

  31. Review of Rough Winds: Extreme Weather and Climate Change by James Powell
    #179, we'll just have to disagree on your idea of preferred data. #178: So you accept that the globe is hotter and there is more water vapour in the air? This is a good start! Do you also accept that hotter air temperatures will lead to more evaporation, faster drying out of the land, and once the land is dry, even higher temperatures (as the energy isn't used in evaporation)? And do you accept that more water vapour in the air golobally leads to increased precipitation globally (what goes up must come down)? Do you think all this precipitation is drizzle? Sphaerica and Eric's points are also good - that not every weather type will necessarily intensify or increase in frequency with warming, but there is good reason to expect that some types will intensify/increase (e.g. more precipitation, more evaporation).
  32. Between St. Roch and a cold place
    You didn't mention one of my favourite transits: the tanker Manhattan in 1969. There is a climate change link - part of the push to transit the NWP was driven by the finding of oil in Prudhoe Bay, and the desire to have a shipping route to the eastern coast of North America. There were the usual geo-political implications, too. The US didn't recognize Canada's claim to sovereignty over the passage, and didn't ask permission to go. Canada sent an ice-breaker to tag along, anyway, and it did have to provide assistance on occasion.
    Moderator Response: That was certainly a first for a vessel of that size (the length of the Empire State building, apparently), but the article was getting too big (yes, bigger than you can see here !), so I decided to stick to the smaller craft in general.
  33. Michaels Mischief #3: Warming Island
    Jonathan@43: The only reason I can see not to use Danmarkshavn is that the temperature record starts in 1950, while Angmagssalik exist prior to 1900.
    Or you could use both. Use the closer one when it is available, and the more distant one to extent the record, after showing that the two follow a sufficiently similar pattern during the period of overlap. Unless, of course, the closer one shows something you don't want people to see, and need to resort to cherry-picking to get your message out.
  34. Climate Change Could be Expensive for Canada
    Jonathan @ 26: The NRT report did not include the costs of heating, but only cooling, which was my original beef. Would you not agree that omitting 90% of the costs is somewhat misleading?
    It isn't the absolute cost, it's the change in costs. Will the heating bill drop more than the cooling bill rises?
    Jonathan @ 24: First off, most of us who live north of the 45th parallel do not have air conditioning. We do not need it.
    ...and how much will it cost to install when you do end up needing it? Here is a story from CBC news in 2007, about Regina area hospitals needing to shut down elective surgeries because the cooling systems could not cope with the high heat and humidity. The cost of the heat wave is not simply measured by the use of extra electricity to run the AC a little more. Usually when Regina (or elsewhere in the western Canadian prairies) gets hot, it's dry. The unusual conditions of high temperature and high humidity was leading to increased risks of infections in surgery. Brutal heat, humidity wreaking havoc at hospitals How much do you think it costs to upgrade a hospital's heating/cooling system?
  35. Michaels Mischief #3: Warming Island
    Jonathon @43, the Mittivakkat Glacier shown in my 26 is just 15 kilometers North-west of Tasiilaq/Angmagssalik. As you can see, while the glacier retreated between 1931 and 1943, it continued to retreat extensively thereafter. If we are to take Tasiilaq/Angmagssalik as typical of the climate conditions over the 20th century at Warming Island, then while we can possibly expect glacial retreat in the 30's and 40's (although that is not certain because of the more Northerly latitude), then we should also expect that retreat to have been ongoing as it was at Mittivakkat. You and Michaels may wish to argue conditions where sufficiently different at Warming Island that the glaciers retreated in the 30s'and 40's, then grew again in the 60's and 70's before retreating again. I would certainly entertain that as a possibility, but if your argument depends on the difference between the Warming Island climate and that at Tasiilaq/Angmagssalik, then there was no excuse for not showing the more local and relevant temperature series from Danmarkshavn. On the other hand, if the claim is that Tasiilaq/Angmagssalik is sufficiently representative of the Warming Island Climate, then Mittivakkat must also be considered sufficiently representative of glacial behaviour at Warming Island, from which we can deduce that the ice tongue has retreated relative to 1957 even 1985 when the ice shelf entirely filled the strait between Warming Island and Liverpool land (see second picture in main article), let alone in 2005 when the the strait opened.
  36. It's ozone
    Shibui - Note that a cooling stratosphere is one of the fingerprints of greenhouse gas increases. The troposphere warms, the stratosphere cools, as heat is increasingly kept lower in the atmosphere. A cooling stratosphere is entirely expected given current forcings.
  37. Philippe Chantreau at 14:32 PM on 5 October 2011
    Understanding climate denial
    This site adresses questioning that is not truly critical, nor constructive, nor sincere. The latest examples on Pat Michaels' island foolishness and the common argument on the NW passage are 2 typical examples. Denial is not critical questioning, especially when coming from people who are poorly informed or lack the qualifications.
  38. Between St. Roch and a cold place
    Nice article. Now there is no point for any denialist to stick to the "St.Roch did it in 1940s as well" story, because of such overwhelming precipitation of debunking eveidence. On the other hand, the evidence or other aspects of climate change are not so obvious and denialist claims still stick to some minds. One related that comes to mind is that antarctic is not warming at the same rate as arctic. While antarctic peninsila ice shelf is desintegrating, some other places are gaining ice, i.e. middle of the continent, is one of favourite stories by lord Monckton. Perhaps someone has the details of similar antarctic story that would compare the antarctic conditions back and then. For example, the story of Scott who had frozen to death trying to bet Amudsen to reach S pole. And compare this story to what people living in the various stations McMurro, Vostock, SPole, etc are saying life is like (and how cold) over there.
  39. Between St. Roch and a cold place
    Thanks for a most interesting post.
  40. Review of Rough Winds: Extreme Weather and Climate Change by James Powell
    skywatcher @ 168 "Norman, I've pointed you towards links that are not just anecdotal, yet you ignored them." I did look through your Stu Ostro document. The other links you posted were to disaster reports. I did not ignore them. I just stated there are potential flaws in using disaster data to prove extreme weather is on the increase. These are all know variables to the disaster data. More people, more houses, more expensive houses. The uncertain one is how population is moving around, where is population growing and where is is decreasing. I think direct measurements for this important topic are needed. Ones not based upon a variable that changes with time in nonlinear fashion.
  41. Understanding climate denial
    Anyone here remember the Phlogiston Theory? Or Spontaneous Generation? Or the Ether Theory? When big science starts sounding more like religion, perhaps it’s time the rest of the world starts praying? Scientific consensus has been wrong at times. Good science should welcome critical questioning. I imagined that was the purpose of this thread. Before this comment is deleted (again), would somebody care to explain why?
    Moderator Response: [muoncounter] Your prior versions of this comment were deleted because they violate the Comments Policy. Please review that policy; posting here is a privilege, not a right. Try to deal in evidence and science rather than unsubstantiated rambling about long discredited hypotheses - 'the luminiferous ether' wasn't a theory. What science is 'sounding like religion'? And what science does not welcome critical questioning?
  42. Arctic icemelt is a natural cycle
    And, Dana69, no matter what the non-GHG explanation for the rapid downward trend, one would still need to explain why GHG-based warming isn't a factor. GHG warming is happening--must be, according to the physics of radiative transfer.
  43. Review of Rough Winds: Extreme Weather and Climate Change by James Powell
    Anne-Marie Blackburn, James Powell brings up the European 2003 heat wave as one sample of increasing hazards from global warming. I did find this link on the item that gives a detailed explanation of the cause of this phenomena. If you ignore the author's opinions at the end of the document you can see if his analysis is valid. Heat Wave in Europe in 2003 explained. I do like how this author gives a mechanism to explain the events and also this explains why using a statistical bell curve for weather extremes may not be a valid approach. Extreme weather events are not random events that occur. The take place because conditions have been set up for their formation. I did not see any mechanisms or explanations for extremes other than the globe is hotter and more water vapor is in the air. No mechanism explaining how this will produce more intense rainfall or droughts in the future.
  44. Review of Rough Winds: Extreme Weather and Climate Change by James Powell
    Anne-Marie Blackburn @171 I did purchase the book. It was mostly the same items that have been covered on SkS. There was a valuable resource link that James Powell linked to in this ebook. I saved it to my favorites and will go through it slowly. It is a rather long and detailed document and will take some time to study properly. Good resource to see if extreme weather is increasing.
  45. Michaels Mischief #3: Warming Island
    Tom, The only reason I can see not to use Danmarkshavn is that the temperature record starts in 1950, while Angmagssalik exist prior to 1900. The trends are similar, the 1950s are 1C cooler in both sites, and both show ~2.5C rise over the past 30 years. Since the Danmarkshavn temperature record does not include the higher melt years of the 1930s and 1940s, a good correlation cannot be made. The Jan Mayen plot shows similar trends, except that the 1930s are cooler than present.
  46. Arctic icemelt is a natural cycle
    But what drives 'these changes'? If extended periods of the positive phase of the oscillation were expected, observable or historical phenomena, we'd expect historical, archeo/paleo/anthro or geological records to show this, along with an equivalent loss of ice. They don't. Something is changing the oscillation and the ice melt/freeze, and we know that such changes must be driven by some physical, chemical, biological or geological impulse. There are only two such changes contemporaneous with the change in the oscillation and the associated over-a-cliff drop in Arctic ice. The biological/ecological population explosion of one particular mammal and a simultaneous injection of GHGs into the atmosphere. Change doesn't just happen. Something makes it happen.
  47. It's ozone
    Ian, Thank you. The reason for the colder stratosphere is a somewhat grey area ...
  48. Arctic icemelt is a natural cycle
    Dana69: And what do you think is responsible for this change in an ongoing oscillation? If this truly means this oscillation is no longer oscillating, why would the natural cycle stop on its own?
  49. Michaels Mischief #3: Warming Island
    Robert Wray @30, I'm happy to acknowledge your greater expertise in this area, however, my understanding is that for a given temperature, the extent of melt will be a function of the thickness of the ice, which is in turn a function of the age of the ice. That is why the Arctic Minimum Ice Extent continues its death spiral even though temperatures are not very much above 2002/3 levels. Earlier ice melts from warm years in 1998 and 2002-5 have resulted in a loss of multi-year ice, resulting in greater ice melt for a given temperature. As Arctic temperatures did not rise to a sustained peak in the mid 20th century, it is likely IMO that there was a loss of multiyear ice in the late 30's and early 40's, but then the temperatures fell away before there could be substantial loss of ice extent. If you disagree with me, perhaps you could repeat your analysis but for the July-September average rather than for the minimum extent so as to allow comparison with the historical record.
  50. Arctic icemelt is a natural cycle
    Hmm, Why is there no discussion on the changing Arctic oscillation patterns as a reason for the Arctic ice melt? "Over most of the past century, the Arctic Oscillation alternated between its positive and negative phases. Starting in the 1970s, however, the oscillation has tended to stay in the positive phase, causing lower than normal arctic air pressure and higher than normal temperatures in much of the United States and northern Eurasia." http://nsidc.org/arcticmet/patterns/arctic_oscillation.html Could it be these changes, and not CO2 that is causing the melting ice in the Arctic?

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