Arguments
Recent Comments
Prev 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 Next
Comments 51101 to 51150:
-
Kevin C at 08:15 AM on 11 December 2012Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
Pete@1: That was indeed an interesting read. Thanks for posting it! -
scaddenp at 07:23 AM on 11 December 2012Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
Not fun trying to measure CH4 emissions from coal mining either but its pretty easy to conclude that you have 100% loss of coal bed methane to atmosphere during the mining and processing. Before screaming too loudly about fracking I would like to some decent comparison of CO2e per GWh for coal versus shale gas. -
Son of Krypton at 06:23 AM on 11 December 2012Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
"Walter Anthony and her colleagues estimate that subcap seeps (seeps of fossil, thermogenic methane through discontinuous permafrost) may be currently emitting as much as 2 Tg of methane per year. This compares to an estimated seepage of 3-4 Tg per year for the rest of the world from surface seeps (excepting mud volcanoes)." Well, that certainly is disconcerting. Given that this rather enormous amount doesn't even take into account biological permafrost methane, one would think that it might just justify the IPCC including the permafrost carbon feedback in the AR5. Absolutely stunned me to learn that it was being left out -
Doug Bostrom at 06:12 AM on 11 December 2012Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
Jim, you'll want to compare the current volume of water being moved via routine overturning circulation w/the possibilities of OTEC. Down the road I suppose it's conceivable that overturning might become so sluggish as to need help but as it stands now the volume in play is quite astounding, about 575,000km3/year or ~1km3/minute for the Atlantic. Not sure if the Pacific is larger or smaller but let's assume bringing the Pacific into play doubles that number. A lot of infrastructure would be necessary to obtain a useful boost on those numbers. -
DOOMDAYS at 05:45 AM on 11 December 2012DIY climate science: The Instrumental Temperature Record
thanks kevin I had not realized that they hadsst3 data only through 2006 :-b ... good to go on enjoying your wonderful application.. -
Jim Baird at 04:00 AM on 11 December 2012Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
The poles are warming faster than the rest of the planet because of energy in the atmosphere that is carried to the poles through large weather systems. The consequence is we have the threat of methane releases from the permafrost and icecap melting. These systems are driven in the main by sea surface heat which can be sapped to produce energy with OTEC. The more energy produced the more the ocean surface is cooled. Part of this heat is converted to mechanical energy in the process but the bulk, 20 times the energy produce, is moved to the deep water heat sink that has a lower coefficient of expansion. Kevin Trenberth, points out in a paper, "An imperative for climate change: tracking Earth's global energy", "The warming required to produce 1 mm SLR if the heat is deposited in the top 700 m of the ocean can take from 50 to 75 1020 J, or 110 1020 J if deposited below 700 m depth. In other words you can move heat from the surface to the depths with OTEC to counter 50 percent of current sea level rise due to thermal expansion. By sapping the heat of hurricanes you also diminish the amount of heat that would be moved from the tropics towards the poles and thus forestall melting. This is the lesson of Hurricane Sandy, no one apparently cares to learn. Disclosure - patents pending -
Kevin C at 02:01 AM on 11 December 2012DIY climate science: The Instrumental Temperature Record
Thanks Peter! I don't know if Javascript will handle the sheer size of the ISTI data, but I'll certainly give it a try if the data format is manageable. -
michael sweet at 01:51 AM on 11 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
KR, I stand corrected. I did not go far enough back in her publicaton record. -
peterthorne at 01:46 AM on 11 December 2012DIY climate science: The Instrumental Temperature Record
This is really good stuff. We just released the second beta version of the databank for ISTI. See this blogpost which describes it. And earlier posts that characterize the first beta release which isn't a million miles different. At around 35,000 stations its a substantive increase in station numbers over what already exists. It would be interesting to see how it compares in the different ways of slicing and dicing here. Using just our default formatting this seems to show a greater warming trend than GHCNv3 (raw vs. raw - we'll be working on creating a new homogenized GHCNv4 product off the databank once its frozen in first release form in Jan). That difference seems not primarily to be down to sampling new areas of the globe. I aim to write something on that this week if I get the chance. -
Kevin C at 01:34 AM on 11 December 2012DIY climate science: The Instrumental Temperature Record
DOOMDAYS: Are you using the HadSST3 data? That only runs to 2006. The results will get truncated to the shorter running of your land and ocean data. (Hadley are being a bit slow on this one, given that HadCRUT4 is now monthly.) Caerbannog: Thanks for the comments. Your work inspired some of the features. You're also a lot more effective at reaching a diverse audience with your results than me. But there's room for lots more people to join in. We really want instrumental temperature record apps Windows, Mac, Linux, Android and Ipad. Also different methods, like Nick Stokes'. I've got some of the code for my version in python as well as javascript which could be a base for the PC versions. -
John Hartz at 23:53 PM on 10 December 2012It's El Niño
@ skywatcher #180: Excellent summary of why Tisdale's dog will not hunt. Thank you for all that you do. -
skywatcher at 18:04 PM on 10 December 2012It's El Niño
Bob Tisdale #158-163, thanks for at least making an attempt to answer my questions. Unfortunately, despite the verbose nature of your responses, you are still under the mistaken impression that you have a unidirectional energy imbalance driven by ENSO. You appear to conveniently highlight when heat is stored, while neglecting that heat is released during other phases of ENSO. Additionally, you completely avoid providing any sort of an explanation as to why ENSO would have fundamentally changed in the past century. This is, in fact, really important, as without this you are arbitrarily claiming that a unidirectional natural process magically came into being just in time to coincide with large industrial emissions of CO2. Your answer in #162 is almost comically poor, as it makes no attempt to come up with the necessary process or supply any evidence, it just verbosely dodges the question. I understand that the hordes at WUWT are rather easier to please, but it is actually necessary to have a physical mechanism that works beyond the last 30 years of data - as Kevin C has tried to show you. You top it off with some entertaining approaches to greenhouse physics. We observe less heat is escaping to space, at GHG-specific wavelengths (these are the same long-lived greenhouse gases that make Earth habitable), and more longwave radiation is observed to return to the Earth's surface, also at these GHG-specific wavelengths (e.g. Harries et al 2001, Philipona et al 2004 etc). Where is this heat going? You cannot escape this question by implying that the heat vanishes from the system simply beause longwave radiation does not penetrate deeply into the ocean directly! You're implying that all this energy is not accumulating in the Earth system, so it must, logically be escaping somewhere, in your world. Where? We can see it's not going into space. You seem to want to wish away the observed energy gain we see as a result of greenhouse gases (coincidentally what we have expected from a century of radiative physics), and you want to wish into existence a mysterious new unidirectional process causing the oceans to warm because of ENSO. But sadly, your answers are long on words, and short on physical mechanisms, and ultimately disappointing for those of us who want to be able to explain the full body of empirical evidence. -
Bernard J. at 17:00 PM on 10 December 2012Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
And there's also the small matter that a 10 metre sea level rise would not manifest in isolation from other, extremely serious impacts... Oh, and there's the other small matter that if it gets to the stage of a 10 metre increase in sea level, it's not likely going to be stopping there. And if we've pushed the system that far, the final equilibrium point described by those aforementioned other, extremely serious impacts isn't one in which there will exist on Earth anything resembling a Western-style human society. Indeed, if it reached that point there'd likely not exist any society where even printed words and reticulated water supplies were in use. -
mattking at 16:53 PM on 10 December 2012Weighing change in Antarctica
Yes, GRACE doesn't help at all for the ice shelves since there is no mass change in the column when a *freely floating* block of ice melts. GRACE could be used to help remove any sea level component from altimetry, but that depends on good snow densification models for the altimetry, as well as a good GIA model for GRACE. And it's a small signal. For now, I think the most useful thing about the ice shelves is that we can use GRACE measurements over them to tell us something about the accuracy of the GIA models near to the regions of grounded ice. -
Tom Curtis at 16:30 PM on 10 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
climateadj @9: 1) You commented, and I criticized your comment on the cause of the increase in losses due to climate related phenomena. That increase is not adequately explicable in terms of increased population, property values or the locations people choose to live (although they are relevant factors) as is shown by the two graphs I showed. Your pseudo explanation in terms of people living preferentially on the coast was just that, a pseudo explanation. 2 You have changed the subject away from the original point on which you commented, which as a defence of those comments tacitly concedes that my criticism was correct. 3 As proof of your careful thought about these issues, you provide us with the link to a website purporting to show an analogue of the Power Dissipation Index of "northeastern land falling tropical storms". Your analogue of PDI is just the wind speed cubed. The actual PDI is the maximum sustained wind speed cubed integrated over time. Hurricane Sandy lasted three times the duration of the two Hurricanes in 1869 that dominate your list. The actual power dissipated by a Hurricane (PD, as opposed to PDI) is also integrated over area. Hurricane Sandy was the largest Hurricane by diameter ever measured, with a diameter of 1,800 km. The two hurricanes you note in 1869 where quite small, with one being only 97 km in diameter at landfall, and the other not significantly affecting Massachusetts though it made landfall in Maine. That suggests Hurricane Sandy dissipated somewhere in the order of 50 times the power dissipated by those two storms combined. Your "index", however, would not show this; and does not even include Sandy on the list. I should note that the size of Sandy alone shows it to not be the old normal. Whether it is a new normal remains to be seen. Consequently, while evidence of a willingness to do some calculation, your site hardly constitutes proper analysis. To your credit, the work you have produces might well be the sort of graph that would appear on Roger Pielke Jnr's site, but is not the sort of work I would expect from a professional. 4 The most interesting feature of your site was the list of North East landing tropical storms. It shows that about 10% of such storms arrived as late in the year as, or later than Hurricane Sandy. The latest landfall was November 28th, 1888. It is not apparent that any of the approx 10 late land falling tropical storms hybridized with a cold front thus forming a "frankenstorm", although certainly they had the potential to do so. Ergo the lateness of Sandy in no way suggests that this is a new normal. 5 Nobody speaking though fully would suggest that global warming "caused" Hurricane Sandy. There are too many factors involved, most of them meteorological rather than climatological, in the formation and development of a Hurricane. But increased Sea Surface Temperatures are positively correlated with Hurricane power (PDI), and increased sea levels will increase the final depth of storm surge. It follows that global warming has contributed both to the destructive force and the magnitude of the storm surge of Sandy. Without global warming, an equivalent storm would have been less damaging.
Whether Hurricanes of such large diameter could have existed without global warming is another matter. As it happens, none with a diameter greater than 750 miles has been recorded prior to 1996, although that may just be a matter of the inability to record storm diameter prior to reliable flight.
-
Albatross at 15:07 PM on 10 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
climateadj, You don't seem to realize that you are missing at least one key issue here. Namely, that the "cold" unequivocal fact that weather systems today are developing in what has become the new norm, a warmer and more moist troposphere. It is this more energetic setting that is a cause for great concern, an apt analogy is weather on steroids. Trenberth (2012) spoke to this very issue, "All weather events are affected by climate change because the environment in which they occur is warmer and moister than it used to be." What is more, this new norm includes higher ocean temperatures and higher sea levels that further compound the issue. Think of cumulative effects. To deny that storms are now developing in a new norm, or that this won't have consequences, one has to deny that the atmosphere and oceans are warming, that (consistent with the Clausius-Clapeyron relationship) the atmospheric water vapour content is increasing and that ocean levels are rising. -
Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
It is noteworthy that currently it is very difficult to actually measure fracking contributions to methane and/or leaked natural gas. Several attempted studies in my old stomping grounds (Pennsylvania and New York states) have been quashed or unfunded due to industry and local resistance to on-site measurements. "Drive-by" measures show methane levels more than 3x regional averages - but on-site counts are simply not available. -
Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
michael sweet - "Sea ice" has 21 hits on Curry's publications (from that online list). Most of those articles are pre-2005, but include the like of Liu, Curry and Hu, 2004: Recent Arctic sea ice variability: connections to the Arctic Oscillation and the ENSO, and among others Holland and Curry, 1999: The role of different physical process in determining the interdecadal variability of Arctic sea ice. I believe such articles are relevant to Curry's knowledge - a decade will have some impact on currency, but not on familiarity with the basics of the field. As is (more recently) Dr. Curry's emphasis on "uncertainty monsters", if only by very puzzling contrast. -
Alpinist at 13:31 PM on 10 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
This is the old "more stuff in the way" argument. There are a variety of metrics you can use to measure this and Tom has pointed out a couple. There are lots more and if anybody would have a real interest in figuring it out, the global insurance industry certainly does. Google Munich RE for what a big reinsurance company thinks. -
Andy Skuce at 12:26 PM on 10 December 2012Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
Agnostic, I acknowledge that the issue of fugitive emissions from shale-gas operations is not yet settled and that in some instances there may well be significant gas leaks. As far as I can tell, contra to your link, the apparently leaky gas fields in Queensland are coal-bed methane fields, which are typically shallower than shale gas fields and are not artificially fracked. Not that the climate system cares where the methane comes from... One source of GHG emissions from some shale-gas operations that is incontrovertible is the deliberate venting of carbon dioxide from some fields after it has been separated out from the produced methane to make it saleable. For example, in some shale-gas fields in British Columbia, the produced gas contains 11% CO2. It would be relatively cheap to sequester this gas (much of the cost of CCS is the separation cost, which is already sunk in this case), but this has not been mandated by the provincial government. -
Doug Bostrom at 12:20 PM on 10 December 2012Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
Further to Magnus and Tom, maybe as so often is the case "it depends," in this case on what we mean by "our society." If you live in Norway it's reasonable to suppose 10m would not effectively collapse society. For Bangladesh a different story; most of Bangladesh is below 10m, with the capital Dhaka at 4m. It's hard to imagine most of the ~150M population of Bangladesh making a move to the <20% of the country left dry by a 10m rise in sea level and in any case they'd be confronted with the problem of what to eat after virtually their entire inventory of arable land was lost. There are a number of other countries in the world that live in a similar "deltaic mode." -
climateadj at 11:41 AM on 10 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
Tom Curtis @6 "Or perhaps there just are some people who will say anything to avoid actually thinking about the data." Actually, I've thought about the data, closely: https://sites.google.com/site/climateadj/home/noreast-pdi There's no evidence that Sandy like storms are the new normal. We are in a period of high activity which is the old normal. God forbid if the 1869 hurricane season repeated itself, with the storm tracks a couple of hundred miles south. There's a name for people who refuse to look dispassionately at the data. It starts with an "a". -
Tom Curtis at 11:38 AM on 10 December 2012Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
I should note, with regard to Magnus claims (@4), even a 10 meter sea level rise would not, by itself, be enough to cause the collapse of our society, or even significantly impoverish us. In particular regions, sea level rise is likely to be devastating in terms of lives lost and financial costs, but primarily by worsening the impacts of storm surges. A very small percentage of the total land surface will be lost to inundation. Consequently, except in low lying deltas, the cost of adaption will be met simply by moving major cities about a kilometer inland - something certainly within our economic ability. -
Tom Curtis at 11:31 AM on 10 December 2012Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
chriskoz @8, I think you are completely correct on this. A 5 meter sea level rise per century would be equivalent to melting a third of the combined West Antarctic Ice Sheet (WAIS) and the Greenland Ice Sheet (GIS) within a 100 years, which is IMO not credible. Hansens formula of 1 mm of sea level rise in 2005-2015, doubling every ten years results in the complete melting of all ice sheets by 2175, a 70+ meter sea level rise in under two centuries. Plainly the doubling time (if it exists at all) must terminate rather quickly, and is very likely to do so at, or less than, the Heinrich event rate. Being fair to Hansen, his point appears to be, not that sea levels will rise by five meters in this century, but that far more rapid rises than is allowed for by linear increases are possible, so that the likely rise is significantly above linear projections. He may be right in that. I would not exclude a two meter rise, although I believe the 1 to 1.2 meter range to be far more plausible. -
chriskoz at 11:06 AM on 10 December 2012Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
Thanks DB for the link to Hansen 2012. The claim therein, of exponential, 7y doubling, IS desintegration is from the curve fitting to GRACE data, as seen on its Figures 8a-d. With such curve fitting, it finds the SLR as high as 5m by 2100 possible. I find the practice of such curve fitting questionable. Especially, if it arives at the improbable conclusion of dSLR 50mky-1 (5mcentury-1), not seen in last 1500ky, far in excess of Heinrich events. On top of that, it must be remembered that strong negative feedbacks on melting rates do exists, like ice flow rates and cooling of the upper ocean. And there is simply not enough ice (far less than the emount of Laurentide IS than triggered Heinrich events) to sustain the exponential rate. So Rahmstorf 2007, being a conservative, semi-empirical linear model, concluding 1m SLR in 2100 is more realistic. -
Tom Curtis at 10:50 AM on 10 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
Michael, a term search for "Arctic" on her publications list turns up 54 hits. Those hits will include the 2 hits for "Antarctic". Clearly the majority of her polar related research has been related to the Arctic rather than the Antarctic. A search for "Ice" turns up 49 hits. I gather she has researched the meteorology of the Arctic, including ice formation in clouds more so than sea ice extent. "Sea ice" returns only 21 hits. -
Riduna at 10:26 AM on 10 December 2012Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
Doug H A number of Papers have been published recently on fugitive emissions of natural gas, variously estimating them at between 2%-5% of total production. There are indications in Australia that fracking may result in much higher emissions, though it is unclear if these are from the ground above the fracked area or the well head area. Andy S notes that … leakage and other environmental consequences of fracking have been exaggerated … However, preliminary (non peer reviewed) research undertaken by the Southern Cross University in Queensland indicates that methane concentration in the atmosphere above areas where fracking gas mining has occurred are around 3 times higher than the global average. http://www.istockanalyst.com/business/news/6155419/fracking-blamed-for-methane-releases As pointed out by scaddenp significant venting of methane also occurs during coal mining. With introduction of the carbon tax, it is expected that several of the most “gaseous” mines in Australia will find it is no longer economic to continue operating and will close. -
michael sweet at 09:19 AM on 10 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
KR, I read Curries publications back to 2007 and saw one paper on Antarctic sea ice. Can you suggest what years she published anything on arctic sea ice? I know she has several blog posts on sea ice but I do not count them. Her web page calls her an atmospheric scientist and her papers mostly talk about the atmosphere. -
vrooomie at 09:11 AM on 10 December 2012Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
Andy S@5: Your link does not work for me, in Google Chrome.Moderator Response: [AS] Thanks, fixed! -
Andy Skuce at 08:50 AM on 10 December 2012Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
chriskoz@2 Thank you. My opinion is that the leakage and other environmental consequences of fracking have been exaggerated by some environmental activists. There are leaks and other negative consequences from fracking, of course, but many of these problems can be mitigated with stringent regulation. I think that natural gas, shale gas included, can be beneficial in reducing GHG emissions in the short term, especially if it displaces much more damaging coal . However, most of the gas is going to have to stay in the ground if we want to avoid a climate catastrophe, so I am opposed to new fossil fuel developments of any kind so long as they don't pay their way through a carbon tax and compensation for their other environmental impacts. My opinions on shale gas development are broadly consistent with the view of this report by the Pembina Institute, which was funded by the David Suzuki Foundation. -
Andy Skuce at 08:17 AM on 10 December 2012Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
Doug@1: You are probably correct that most fugitive methane comes from gas production (and also gas storage and transportation), at least that's what the EPA says for US sources. Note that the numbers in the EPA table are CO2 equivalents not the weight of methane, so they need to be divided by 21 [edited] to compare them to the numbers mentioned in the article. Significant amounts of methane comes from oil and (as Phil Scadden said) coal production, as well. I have a hunch that oil production in countries that have less stringent engineering and regulatory standards that the US quite likely vents proportionally more methane than the US, but I don't have a reference for that. There's also a very comprehensive EPA report on natural sources of methane, although it does seem (to me) to downplay permafrost methane emissions, at least in the light of recent permafrost research. I'll maybe add these links to the main article. -
Tom Curtis at 07:55 AM on 10 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
climateadj @4. Your right. And the the assets in California are increasingly "sky high" as well, which no doubt accounts for the increasing number (not cost, but number) of geophysical disasters in North America:
Oh sorry, there is no noticable increase in geophysical disasters, but meteorological, hydrological and climatological disasters are going through the roof.
And, of course, assets in the mid-west must also be "sky high" to account for the surge in thunder storm damage:
Or perhaps there just are some people who will say anything to avoid actually thinking about the data. What do we call them, now. I think it starts with a "d" ....
-
scaddenp at 04:53 AM on 10 December 2012Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
chris - mining coal leaks CH4 something terrible too. -
dana1981 at 04:17 AM on 10 December 2012The Latest Pre-Bunked Denialist Letter in Lieu of Real Science
Indeed jackdale, no Lindzen, Spencer, Christy, Curry, etc. -
DSL at 03:37 AM on 10 December 20122012 SkS Bi-Weekly News Roundup #7
Atrocious comment stream at NYT today. Article is on Doha: "Ignoring Planetary Peril, a Profound ‘Disconnect’ Between Science and Doha." -
Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
michael sweet - "Curry is an Atmospheric scientist and has not published any papers on Arctic sea ice extent" Actually, Judith Currys publications list includes a great deal on Arctic and Antarctic ice. Which makes it even more puzzling that her major recent contributions to the discussion appear limited to handwaving about "uncertainty monsters" and throwing her support behind 'skeptic' arguments and myths - she should certainly know better from her own work. -
jackdale at 02:42 AM on 10 December 2012The Latest Pre-Bunked Denialist Letter in Lieu of Real Science
daba@39 It interesting who did not sign it; Curry and Spencer being the most conspicuous. I assume that would have been asked. -
climateadj at 00:44 AM on 10 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
Of course the storm related insurance claims are "going to just keep coming". The value of assets along the coast are increasingly "sky-high". -
DOOMDAYS at 00:00 AM on 10 December 2012DIY climate science: The Instrumental Temperature Record
@Kevin C Incredible job Kevin congratulations, it is a very usefull aplication , only a little obsevation , the graph generated only goes to 2005 ? Why? exist some reason to no show the last six to seven years? I think it would be appropiate for the generated graph to the last data was available, if not, the fake skeptics can accuse us (hey are hiding the last year "cooling")or (you are "cherripik" the data) We should follow the example given from this web, always trying to use (all available data) and not just a part, although that part is most. -
michael sweet at 21:28 PM on 9 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
Otto, It is true that Dr. Box specializes in ice changes and insurance rates only rely on an unbiased evaluation of how much damage occurs. We would be much better off at WUWT where the commentators (like the host) often have no science degrees at all. This Skeptical Science post (among many found by searching "extreme weather" quantitates extreme heat and shows that the extreme heat (and associated drought) in the American Midwest this year is 98% likely caused by global warming. That's a quick $50 billion damage in the US alone. AGW added almost a foot of sea level rise before Sandy. the damage caused by the last foot of the flood is entirely caused by AGW. Recently the Dutch Government wanted to have a discussion of Climate related problems. The first topic was Arctic Sea Ice collapse. See this RealClimate link for details. They used Judith Curry for the skeptic voice. Curry is an Atmospheric scientist and has not published any papers on Arctic sea ice extent. Presumably no actual ice experts were willing to provide a skeptic voice. Why don't you go over to that blog and post your objections to using Dr Curry since she is not an expert on Sea Ice Extent. -
Rob Painting at 20:13 PM on 9 December 2012Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
Chriskoz - see the text under that heading. A long time perhaps by human time scales, but a blink of an eye in a geological sense. -
chriskoz at 18:28 PM on 9 December 2012Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
Interesting article Andy, I cannot wait for the next part. I have a feeling that recent 2012 reduction in US CO2 emissions (sadly more than offset by increases in the rest of the world, China, India), if coming from from a large switch from coal-based to gas-based fuels, may be misguided, if said gas comes from fracking. Fracking leaks CH4 and I'm even not sure if we can quantify the amount of leakage (surely the recent CH4 increase must be coming from those, let's hope they are not from permafrost melt) so I'm not that positive about those emission reductions. Needless to say the environmental destruction of fracking which is OT here. I think burning coal through high efficiency gasification process might be lesser evil rather than gasifying it "in situ" through fracking. Hansen says we must leave coal in place, deniers may say "we are not exploiting coal, just gas through fracking" but they de facto exploit coal, even further, they are destroying the emvironment in the process. -
Doug Hutcheson at 18:17 PM on 9 December 2012Subcap Methane Feedbacks. Part 2: Quantifying fossil methane seepage in Alaska and the Arctic
human-mediated fugitive emissions associated with fossil-fuel energy production ... amount to about 100 Tg CH4 per year
Cheerful thought. I wonder how much of this comes from fracking and gas production and how much from oil production? My guess would be that gas would be by far the greatest source, giving little comfort to areas currently under gas exploration licences here in Australia and around the globe. What percentage of gas is lost to fugitive emissions, anyone know? -
Doug Hutcheson at 17:59 PM on 9 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
Otto1 @ 1 , no-one is saying "climate change is responsible for extreme weather events" like Sandy. To quote from the OP,Climate change, Box says, “shifted the odds in its favor” and made its impact more severe as a result of the warmer sea temperatures along the eastern seaboard … and the resulting higher sea levels resulting from those higher temperatures.
Get it? Shifted the odds. Made the result worse than it might have been. Didn't cause it. -
chriskoz at 17:45 PM on 9 December 2012Past 150,000 Years of Sea Level History Suggests High Rates of Future Sea Level Rise
Paul Magnus@4 you said:So the rate is exponential as Jim Hansen has frequently pointed out and the data is indicating. ie a doubling every 7yrs at the moment
Can you give the source of your claim (if Hansen, then full text is available in which I'm very interested). IMO, the dSLR acceleration cannot be that fast: we are already melting very fast: 35my-1, which is just 4-6 times slower than Heinrich events as seen on figure 1. So we've just 2 of those "doubling every 7yrs" before we reach a desintegration of Heinrich proportions. I'm not saying Heinrich on top of Holocene optimum won't happen but that it cannot happen so fast. Perhaps we will see a doubling of dSLR in this century, perhaps the second dubling later at the end of this century (most of us will not live up to this, only our children). IS response is a slow but sure process in today's state of climate. No one was able to quantify it to date let alone predict "doubling of dSLR every 7yrs"... The section title "Sea Level Rise Closely Follows Polar Warming" is very intriguing but left unquantified: did anyone heard "how closely"? 100y or 500y? -
Doug Hutcheson at 17:41 PM on 9 December 2012It's El Niño
In spite of the volume of Bob Tisdale's comments, I still don't see how he accounts for the TOA energy imbalance. More energy is arriving than leaving: how does his hypothesis account for that? -
Otto1 at 16:53 PM on 9 December 2012Newest Yale Forum Video: A ‘Play-by-Play’ on Sandy with Kerry Emanuel
Color me unimpressed. There is no empirical evidence that climate change is responsible for extreme weather events like hurricanes and superstorms like Sandy. Jason Box's specialty appears to be the Greenland ice sheet, not exactly relevant. And Joe Scarborough pointing to a discussion he had recently had with a man who handles insurance rate tables? Like, wow. -
dana1981 at 16:19 PM on 9 December 2012The Latest Pre-Bunked Denialist Letter in Lieu of Real Science
jackdale @38 - it really doesn't seem like it. They were clearly going for quantity over quality in the letter signatories, similar to the Oregon Petition. They try to get big numbers on these lists, but to do that you need to have really low standards, because nobody who knows anything about climate would sign such utter nonsense. -
jackdale at 12:16 PM on 9 December 2012The Latest Pre-Bunked Denialist Letter in Lieu of Real Science
Did Tom Harris actually vet those who signed the letter? One was banned from WUWT for carpet bombing the site with his nutty views of the sun. (Watt's words, not mine). But as someone who worked with children for all of his professional career, I find this person's past to be rather unsavoury. (That is a meiosis.) -
caerbannog at 14:19 PM on 8 December 2012DIY climate science: The Instrumental Temperature Record
A very impressive accomplishment! Folks here who are (or know) science teachers should do everything they can to see that science students get their hands on this app. Hand some bright young students this ball and see where they run with it. There are so many ways to "slice and dice" temperature data with this "killer app" that it could be the foundation of countless science projects. Now for some perspective, and something that people should tell "skeptics" (and tell them again, and again, and again -- then then tell them once more for good measure): Kevin C has accomplished in a few months what Anthony Watts and his numerous "surfacestations" followers haven't been able to accomplish in over half a decade -- not only has Kevin actually crunched the temperature data and validated the NASA/NOAA/CRU results that Watts and Co. have only sniped at, he has put together a polished, easy-to-use app that lets anyone else do the same. Compare that with what Watts and Co. have failed to accomplish in all their years of "scrutinizing" the global temperature record. And Kevin managed to do all this without filing a single FOI request! Imagine that. The only thing that Kevin's software package is missing is a catchy name. Maybe something like "WattsBuster Professional". Or even "WattsBuster Ultimate" (sorry, Microsoft). Anyway, I've been working a bit on my own global-temperature project (it's not nearly as polished and professional as Kevin's), but it shows another interesting way to demonstrate the robustness of the global temperature station network. I took my own global-temperature code and put a Google Map front-end on it (based on html/javascript kindly supplied by Nick Stokes -- thanks, Nick!). Users can "roll their own" global average temperature results by clicking on stations on a Google Map display and watch the results get updated each time they click on a new station. It's really quite amazing how few stations you need to replicate the NASA/NOAA/CRU global warming trends. (Just a few dozen scattered around the world). I went and rolled everything up into a virtual-machine appliance file. To use it, all you have to do is import the appliance file into the VirtualBox virtualizer and fire it up (very easy -- just a few mouse clicks will do it all). VirtualBox is available at www.virtualbox.org and will run on all newer Windows/Mac/Linux platforms. It is very easy to install and use with pre-built appliance files (like mine). I present the results in two plots: The first plot (upper plot in the display output) shows the global temperature results that my app computes from both raw and homogenized data, along with the official NASA/GISS "meteorological stations" results for comparison purposes. (My raw results are shown in red, my adjusted results in green, and the official NASA/GISS resuts in blue). The second plot (lower plot in the panel) shows how many of the stations selected by the user actually reported data for any given year. (Station counts can be fractional -- if a station reports data for 6 months of a given year, I count it as "half a station"). This way, users can correlate the quality of the temperature results for any given time period with the number of stations that actually reported data for that time period). Folks who want to try out the global-temperature virtual machine can get it here. It's rather a pig of a download (about 1GB), but it encapsulates an entire operating system. Plus, you need to download and install the VirtualBox app and then import the appliance file into it. But it's all quite easy, provided that you have the bandwidth and/or patience to download the virtual-machine file. You will want to have at least 1GB memory on your system. 2 GB or more is desirable -- but 1 GB will work just fine if you make sure that you don't have any other memory-hogging apps running. I chose this virtualization approach because virtualization lets you nail down all the configuration details in a completely automated "start it and let it run" package that will run on almost any popular operating system. Think of virtualization as a "sledgehammer approach" to cross-platform compatibility. To summarize: 1) Download/install VirtualBox (virtualbox.org). 2) Import the global-temperature appliance file into VirtualBox (just a few mouse clicks). 3) Hit the VirtualBox "Start" button and wait for the virtual machine to boot up. 4) Start "rolling your own" global temperature results by clicking on GHCN station icons. That's it. Note: This is just a side "hobby project" of mine, so there are some not-fully-implemented features and other random loose ends that need to be sewn up (but it still works well enough to be a useful educational/demo tool). IOW, YMMV. And finally here's a screen-shot of the global-temperature virtual-machine in action .
Prev 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 Next
