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  • RealClimate
    4 January 2016 This is a second post related to the new Marvel et al 2015 paper The first post dealing with the substantive content is here What with AGU15 going on and a little bit of overlap in content with Shindell 2014 NASA wasn t particularly keen to put out a press release for the paper but we did get a web special put out on Friday Dec 18th the last day of AGU and a few days after the paper appeared online I ve been involved with many similar releases for papers and it is always a struggle to concisely say why a paper is interesting while not overselling it or being too technical which is why only a small fraction of papers get press releases at all As we ve previously remarked about other people s press releases eg Stainforth et al or Willerslev et al properly calibrating the aspect of a release that will get picked up by the media can be tricky and so it proved in this case More References K Marvel G A Schmidt R L Miller and L S Nazarenko Implications for climate sensitivity from the response to individual forcings Nature Climate Change 2015 http dx doi org 10 1038 nclimate2888 Comments pop up 28 Marvel et al 2015 Part 1 Reconciling estimates of climate sensitivity Filed under Aerosols Climate modelling Climate Science Greenhouse gases Instrumental Record IPCC gavin 4 January 2016 This post is related to the substantive results of the new Marvel et al 2015 study There is a separate post on the media blog response The recent paper by Kate Marvel and others including me in Nature Climate Change looks at the different forcings and their climate responses over the historical period in more detail than any previous modeling study The point of the paper was to apply those results to improve calculations of climate sensitivity from the historical record and see if they can be reconciled with other estimates But there are some broader issues as well how scientific anomalies are dealt with and how simulation can be used to improve inferences about the real world It also shines a spotlight on a particular feature of the IPCC process More References K Marvel G A Schmidt R L Miller and L S Nazarenko Implications for climate sensitivity from the response to individual forcings Nature Climate Change 2015 http dx doi org 10 1038 nclimate2888 Comments pop up 30 Older Entries Newer Entries Site Google Custom Search Recent Comments What is the best description of the greenhouse effect Patrick Eriksson What is the best description of the greenhouse effect Kevin McKinney Anti scientists Carbomontanus What is the best description of the greenhouse effect Spencer Marvel et al 2015 Part III Response to Nic Lewis SteveS What is the best description of the greenhouse effect Chris Colose Blizzard Jonas and the slowdown of the Gulf Stream System doiknow What is the best description of the greenhouse effect James Powell Unforced

    Original URL path: http://www.realclimate.org/index.php/page/2/ (2016-02-13)
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  • Blizzard Jonas and the slowdown of the Gulf Stream System « RealClimate
    strong cooling in the North Atlantic from AMOC shutdown does create higher wind speed It would be useful to carry out more detailed studies with higher resolution climate models including the most realistic possible distribution of meltwater The increment in seasonal mean wind speed of the northeasterlies relative to preindustrial conditions is as much as 10 20 Such a percentage increase of wind speed in a storm translates into an increase of storm power dissipation by a factor 1 4 2 because wind power dissipation is proportional to the cube of wind speed Emanuel 25 1987 2005 However our simulated changes refer to seasonal mean winds averaged over large grid boxes not individual storms A blocking high pressure system in the North Atlantic creating consistent strong northeasterly flow would provide wave action that may have contributed to the chevron ridge formation in the Bahamas and Bermuda This blocking high pressure system could contribute to powerful storm impacts in another way In combination with the warm tropical conditions that existed in the late Eemian Cortijo et al 1999 and are expected in the future if GHGs continue to increase this blocking high pressure could create a preferred alley for tropical storm tracks We assumed in discussing the relevance of these experiments to Eemian climate that effects of freshwater injection dominate over changing GHG amount as seems likely because of the large freshwater effect on SSTs and sea level pressure However Eemian CO2 was actually almost constant at 275 ppm Luthi et al 2008 Thus to isolate effects better we now carry out simulations with fixed GHG amount which helps clarify important feedback processes Related https en wikipedia org wiki Cold blob North Atlantic 9 Vittorio Marletto says 25 Jan 2016 at 2 55 AM I am very grateful for the time and effort you devoted to explain what is going on citing recent research and so shortly after the Jonas blizzard This type of voluntary work from scientists helps a lot in understanding such extreme events in the light of science Regards 10 Chuck Hughes says 25 Jan 2016 at 4 23 AM Dan says 24 Jan 2016 at 10 20 PM As an aside to the primary point regarding the slowdown of the Gulf Stream please refrain from using non scientific nomenclature such as referring to the recent snowstorm as Joanas Winter storms are not nor have they ever been named by the National Weather Service or its parent agenct the National Oceanic and Atmospheric Administration I agree that it s a cheap marketing ploy ginned up by the Weather Channel to make storms more appealing and sexy If it proves popular with the kiddies I don t expect it will go away anytime soon Other media outlets have already accepted the practice as legit In other news How quickly could the Gulf Stream circulation come to a halt Do you expect to see Europe go into the deep freeze within the next 30 years or so I do not trust the IPCC projections for end of century conditions especially their projected SLR I think the IPCC missed SLR completely Their ultra conservative assessment is not helpful in that people still think we have a lot of time to act I don t see any reason why Greenland ice couldn t completely collapse in a relatively short amount of time By collapse I don t mean completely melt but maybe break into several large pieces Thanks 11 CM says 25 Jan 2016 at 5 57 AM An item of related interest that just appeared Yang Qian Timothy H Dixon Paul G Myers Jennifer Bonin Don Chambers and M R van den Broeke Recent Increases in Arctic Freshwater Flux Affects Labrador Sea Convection and Atlantic Overturning Circulation Nature Communications 7 January 22 2016 10525 doi 10 1038 ncomms10525 Here we derive a new estimate of the recent freshwater flux from Greenland using updated GRACE satellite data present new flux estimates for heat and salt from the North Atlantic into the Labrador Sea and explain recent variations in LSW Labrador Sea Water formation We suggest that changes in LSW can be directly linked to recent freshening and suggest a possible link to AMOC weakening 12 MA Rodger says 25 Jan 2016 at 5 58 AM The link 5 does give argument against naming winter storms from Joel N Myers the founder and president of AccuWeather aimed at the names originating from a commercial competitor The Weather Channel but this side of the pond the UK Irish Met Offices think that naming is a good thing and so the first storm Abigail was duly christened in November of last year the first of six storms that rattled through the region in two months Mind it may not be the last word as this Met Office naming has been described as a pilot project Then it must be said that the continued use of the synonym The Great Storm for referring to great storms has been getting beyond a joke although this may not be entirely due to AGW increasing the frequency of great storms It is perhaps worth noting that the Great Storm of 1703 was reportedly unprecedented in ferocity and duration but this was also a time that was actually unprecedented for reports of all kinds News bulletins of casualties and damage were sold all over England a novelty at that time Likely in previous great storms the ferocity and duration may have been worthy of comment locally but only until the ferocity and duration of the plague or some other arriving cataclysm made it appear all rather trivial Response I m used to named winter storms from Germany as far as I know named by the German weather service stefan 13 Edward Greisch says 25 Jan 2016 at 7 00 AM In agreement with Chuck Hughes this time If Europe goes into a deep freeze the world is in trouble So is this panic2 0 That would be the case if farming becomes too difficult in Europe Europe would cease to be a place that produces food The global conveyor has been weakening since the late 1930s But no prediction of when or whether the general crop failure would happen For the US east coast I think you aren t talking about a shortening of the growing season Snow is fine as long as it stays in the winter and you aren t growing semi tropical things like peaches and oranges So it is only peaches and oranges that are impacted 4 feet of snow is no big deal if you have enough snow plows and people know how to drive on snow In that sense more snow would help people learn to drive better Washington D C needs a bit of waking up More snow could help bring politicians to their senses 14 Daniel C says 25 Jan 2016 at 7 53 AM Thanks Stefan I was a little confused with the colour switches in the Figures Let me know if I have this right Figures 1 and 2 show increases in SST in blue and decreases in red with respect to a cooling trend For the modelled responses Figures 3 4 shows the same colour pattern but the reverse effect in response to enhanced AMOC How is this similar to what is observed its the reverse of what s observed isn t it which I think is the point In Figure 5 the modelled responses show warming off the E coast and cooling in the sub polar gyre thus showing a similar response to what is shown in Figures 1 2 The colour scheme for Figures 3 4 5 switch to the opposite more intuitive colour scheme as compared to Figures 1 2 Is this right Also any comment on the likely impact this will have on the jet stream and on weather patterns in the UK and Northern Europe if this trend continues Response In all cases the temperature response to an AMOC change in models is consistent an AMOC weakening causes a cold blob in the subpolar open Atlantic south of Iceland and a warming off the US east coast And that is the temperature change that is indeed observed I can t predict the impact on jet stream and weather patterns we and others are still trying to understand this stefan 15 Mark A York says 25 Jan 2016 at 9 17 AM Pat Michaels is at it again at WSJ 16 Omega Centauri says 25 Jan 2016 at 10 01 AM Most likely the results of this mode are just more of what we ve been seeing Which while it includes more superstorms on both sides of the north Atlantic it also seems to include more unseasonable heat waves as well One question for the modelers what impact on the net icemelt from Greenland is this AMOC slowdown likely to have My guess it it probably slows it hence there may be a stabilizing feedback 17 Bernard J says 25 Jan 2016 at 10 21 AM Perhaps we should refer to The Storm That Must Not Be Named especially for the denialists when confronted with the reality of the physics of the planetary heat engine or something along the line of the humerous exchange from the Vicar of Dibley episode The Weather and the Window More seriously though and changing the subject the cold blob is only anomalously cold because it s largely relocated from an even colder area where its temperature is not relatively coldly anomalous and in fact is warmly anomalous where it represents meltwater from ice affected by heat brought in from the tropics The cold blob meme is in some ways reminiscent of the pause where people fail to grasp the underlying phenomena that define the nature of shifts in the appearance of a temperature anomaly It s a notion that should be used with a little care given the denialists propensity for twisting fact 18 Titanium48 says 25 Jan 2016 at 11 56 AM A few things seem odd here The largest positive SST anomalies in the arctic are located between Norway and Novaya Zemlya where is this heat coming from if the area immediately to the southwest is cooling Shouldn t a slowdown of the AMOC be self limiting Less heat transport from subtropical to polar latitudes should result in a cooling of the arctic and a reduction in melting While past climate anomalies that have suggested slowdowns of the AMOC have been blamed on rapid injections of large quantities of freshwater these are believed to have come from drainage of lakes of meltwater This scenario does not shut down the poleward heat transport of the AMOC until after the melting is complete If meltwater drains immediately shouldn t any AMOC slowdown that results be a strong negative feedback with lower temperatures reducing melting Response If you look at our paper in the reference list you will find that we show a model run Fig 2b in which the overturning north and south of the Iceland sill are actually anticorrelated So you can t conclude from an AMOC slowdown that it should get colder in the Arctic Ocean the cold blob predicted by climate models is only south of Iceland which is where it is observed Regarding feedbacks yes temperature does tend to give a negative feedback on AMOC changes salinity a positive feedback the latter is why there is a collapse threshold Slower AMOC brings less salty water up from the south leading to freshening in the deep water formation areas and thus an even weaker AMOC First described by Henry Stommel in the 1950s stefan 19 Hank Roberts says 25 Jan 2016 at 12 24 PM AMOC slowdown thus may have consequences for extreme weather in the US Has everyone read Kim Stanley Robinson ten years ago on this Fifty Degrees Below https www sfsite com 11b fd212 htm One of those tipping points lies in the interaction of cold water from the polar ice cap with the warm water of the Gulf Stream Too much of the polar water which is also less salty and the Gulf Stream could be displaced to the south removing the flow of water that currently warms England and Northern Europe the last time such an event occurred the result was an Ice Age known as the Younger Dryas a period of several thousand years in which England most of Northern Europe and the eastern half of North America lay under a blanket of ice and snow 20 Stu Ostro says 25 Jan 2016 at 1 27 PM Re TWC winter storm naming and science http www weather com news news science behind naming winter storms weather channel 20140121 There are also purely meteorological criteria and decisions involving ridges troughs jets and precipitation in regard to what constitutes a storm and its beginning end 21 Chris Machens says 25 Jan 2016 at 1 51 PM Bernard J The cold blob meme is in some ways reminiscent of the pause where people fail to grasp the underlying phenomena that define the nature of shifts in the appearance of a temperature anomaly It s a notion that should be used with a little care given the denialists propensity for twisting fact It s fine in the future we will likely have more and stronger snowstorms and cold air intrusion into our latitudes and freshwater cools The colder waters block some of the warmer and this increases the temperature gradient cold to warm difference the fuel for storms higher wind speeds higher wave action The days of the deniers are very limited in face of the growing dangerous threat of climate change 22 Patrick says 25 Jan 2016 at 5 10 PM It is like having an obstruction in your cars radiator Slowly your engine starts to overheat 23 Dan says 26 Jan 2016 at 7 23 AM re 20 That proves my point The link shows that the decision to name storms is primarily made by population density impact area Little if any meteorological science parameters 24 Mal Adapted says 26 Jan 2016 at 4 35 PM Hank Roberts Has everyone read Kim Stanley Robinson ten years ago on this First thing I thought of when I saw this RC post Gave my heart a lurch it did Can you imagine our world mobilizing to implement KSR s solution 25 Urs Neu says 27 Jan 2016 at 6 14 AM Re 14 The region of warming off the U S East coast is probably too small to influence the jet stream or rossby waves The cooling region south of Iceland however is broader and together with warming in surrounding areas might favour southward meanders of rossby waves over the Atlantic or southward propagation of cold air if you want which induces the opposite over Europe northward propagation of warm air Which might also increase spatial persistence of rossby wave patterns blocking Just a thought 26 Dave McGinnis says 27 Jan 2016 at 8 33 AM And yet every day millions of acre feet of fresh water are dropped on the Gulf Stream from heavy rain events My radar in Key West routinely shows thousands of square miles of ocean receiving 10 12 inches a week One recent occurrence approximately equaled an entire month s flow over Niagara Falls just one event And is it not a geostrophic current powered by gravity That s what I gained from Sverdrup s book and I temperature wasn t in it Can you clarify Thanks 27 Gail Zawacki says 27 Jan 2016 at 9 08 AM People who are familiar with paleoclimate as opposed to models that don t account for amplifying feedbacks are not surprised Starting p 186 THE OCEAN CONVEYOR The real day after tomorrow http www gci org uk Documents wsav pdf 28 Hank Roberts says 27 Jan 2016 at 10 43 AM Dave McGinnis is it not a geostrophic current powered by gravity Only in that if you take the gravity away it stops So does much else density differences in water masses caused by temperature and salinity variations move water masses through the deep ocean taking nutrients oxygen and heat with them http oceanexplorer noaa gov facts currents html If that s an insufficient answer you ll find that and much more with this https www google com search q ocean circulation cause 29 RS says 27 Jan 2016 at 3 20 PM Why is nobody discussing satellite data You are taking sparse surface measurements like HadSST 3 as gospel yet the satellites say the opposite to surface measurements i e UAH RSS have 1998 and 2010 as both being warmer than 2015 Response Check out Lewandowski he explains it beautifully and clearly Stefan 30 Chris Dudley says 28 Jan 2016 at 9 20 AM The son of a friend of mine came up with Snowzilla and it s caught on a little Handy moniker if you don t like the others 31 FishOutofWater aka George says 28 Jan 2016 at 12 00 PM I think you need to be very careful to distinguish between transient conditions and equilibrium conditions While there is ample evidence of increasing fresh water contribution from melting glaciers and of an AMOC slow down since the 1930s the cold spot intensification last winter and this winter could also be caused by the extraordinarily intense low pressure areas that have slammed this region since last February and the intensification and northeastwards displacement of the subtropical Bermuda Azores high If the recent intensification of the cool spot were caused by a recent AMOC slowdown you would expect to see warming of intermediate waters under a cool fresh water surface layer That s exactly what we see in seas around Antarctica However Mercator Ocean shows that the intermediate waters have cooled under the cool spot Perhaps you are aware of issues with Mercator Ocean s models that I don t

    Original URL path: http://www.realclimate.org/index.php/archives/2016/01/blizzard-jonas-and-the-slowdown-of-the-gulf-stream-system/ (2016-02-13)
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  • Unforced Variations: Feb 2016 « RealClimate
    in air pressure between the poles and more central latitudes led to the extremely low ice coverage throughout much of the Arctic region One imagines winter ice affecting summer ice and negative AO s in spring and summer having some effect 102 Killian says 12 Feb 2016 at 9 35 AM But but but y all said I was un non scientifical Except Intact nature offers best defense Thus the logical correlation is bio mimicked nature is the second best defense Yeah 103 Jim Galasyn says 12 Feb 2016 at 11 29 AM More on the fallout from the CSIRO hit Cuts to Australia climate research devastating almost 3000 scientists tell PM Malcolm Turnbull CSIRO chief defends cuts promising to keep vital climate capability Climate science and the end of the Enlightenment in the land down under Previous 1 2 3 Leave a Reply Comment policy Note we have re activated the ReCaptcha plug in to reduce spam Please let us know if there are any problems Click here to cancel reply Name required Mail will not be published required Website Site Google Custom Search Recent Comments What is the best description of the greenhouse effect Patrick Eriksson What is the best description of the greenhouse effect Kevin McKinney Anti scientists Carbomontanus What is the best description of the greenhouse effect Spencer Marvel et al 2015 Part III Response to Nic Lewis SteveS What is the best description of the greenhouse effect Chris Colose Blizzard Jonas and the slowdown of the Gulf Stream System doiknow What is the best description of the greenhouse effect James Powell Unforced Variations Feb 2016 Jim Galasyn What is the best description of the greenhouse effect Jack Barrett With Inline Responses Marvel et al 2015 Part III Response to Nic Lewis SteveS Marvel et al 2015 Part III Response to Nic Lewis steve s Marvel et al 2015 Part III Response to Nic Lewis Andrew Kerber Blizzard Jonas and the slowdown of the Gulf Stream System Hank Roberts Blizzard Jonas and the slowdown of the Gulf Stream System doiknow Marvel et al 2015 Part III Response to Nic Lewis MartinM Anti scientists Don McKenzie Marvel et al 2015 Part III Response to Nic Lewis Matt Skaggs Anti scientists mikeworst New On line Classes and Models Marcus Pages Acronym index Data Sources Categories Climate Science Aerosols Arctic and Antarctic Carbon cycle Climate impacts Climate modelling El Nino Geoengineering Greenhouse gases Hurricanes Instrumental Record IPCC Oceans Paleoclimate Sun earth connections Communicating Climate Reporting on climate skeptics Extras Attic Comment Policy Contributor Bio s FAQ Glossary In the News Reviews Supplemental data Tutorials hydrological cycle Open thread RC Forum Scientific practice statistics The Bore Hole Books Contributors Highlights Dummies Guide to the latest Hockey Stick controversy El Nino Global Warming and Anomalous U S Winter Warmth Hurricanes and Global Warming Myth vs Fact Regarding the Hockey Stick On attribution On mismatches between models and observations On Sensitivity Part I Tropical Glacier Retreat Water Vapour feedback or forcing Welcome

    Original URL path: http://www.realclimate.org/index.php/archives/2016/02/unforced-variations-feb-2016/comment-page-3/ (2016-02-13)
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  • Acronym index « RealClimate
    LW Longwave infra red radiation MCA Medieval Climate Anomaly MDR Main Development Region for Atlantic hurricanes MJO Madden Julian Oscillation or Intra Seasonal Oscillation MOC Meridional Overturning Circulation ocean MWP Medieval Warm Period MCA is probably more apt NAO North Atlantic Oscillation NH Northern Hemisphere OHC Oceanic Heat Content OLR also OLW Outgoing Longwave Radiation PCA Principal Component Analysis PDF Probability Density Function PDO Pacific Decadal Oscillation PETM Paleocene Eocene Thermal Maximum PHEV Plug in Hybrid Electric Vehicle PNAS Proceeding of the National Academies of Science a journal RCS Regional Curve Standardization method for processing tree ring data from different trees RH Relative Humidity RMS Royal Meteorological Society or Root Mean Square SAM Southern Hemisphere Annular Mode positive wind belt around Antarctic stronger colder SAR Second Assessment Report IPCC SLR Sea level rise SOI Southern Oscillation Index see ENSO SPE Solar Proton Event SPM Summary for Policy Makers usually with respect to IPCC reports SRM Solar Radiation Management SSM Standard Solar Model SST Sea Surface Temperature STP Standard Temperature and Pressure a reference for physical properties SW Shortwave solar radiation TAR Third Assessment Report of the IPCC TC Tropical Cyclone any hurricane TCR Transient Climate Response THC Thermohaline Circulation that driven by temp and salinity effects TOA Top of the atmosphere TSI Total Solar Irradiance WAIS West Antarctic Ice Sheet WMO World Meteorological Organization XBT eXpendable Bathy Thermograph deep ocean temperature measuring devices Comments Off on Acronym index Comments are closed Site Google Custom Search Recent Comments What is the best description of the greenhouse effect Patrick Eriksson What is the best description of the greenhouse effect Kevin McKinney Anti scientists Carbomontanus What is the best description of the greenhouse effect Spencer Marvel et al 2015 Part III Response to Nic Lewis SteveS What is the best description of the greenhouse effect Chris Colose Blizzard Jonas and the slowdown of the Gulf Stream System doiknow What is the best description of the greenhouse effect James Powell Unforced Variations Feb 2016 Jim Galasyn What is the best description of the greenhouse effect Jack Barrett With Inline Responses Marvel et al 2015 Part III Response to Nic Lewis SteveS Marvel et al 2015 Part III Response to Nic Lewis steve s Marvel et al 2015 Part III Response to Nic Lewis Andrew Kerber Blizzard Jonas and the slowdown of the Gulf Stream System Hank Roberts Blizzard Jonas and the slowdown of the Gulf Stream System doiknow Marvel et al 2015 Part III Response to Nic Lewis MartinM Anti scientists Don McKenzie Marvel et al 2015 Part III Response to Nic Lewis Matt Skaggs Anti scientists mikeworst New On line Classes and Models Marcus Pages Acronym index Data Sources Categories Climate Science Aerosols Arctic and Antarctic Carbon cycle Climate impacts Climate modelling El Nino Geoengineering Greenhouse gases Hurricanes Instrumental Record IPCC Oceans Paleoclimate Sun earth connections Communicating Climate Reporting on climate skeptics Extras Attic Comment Policy Contributor Bio s FAQ Glossary In the News Reviews Supplemental data Tutorials hydrological cycle Open thread RC

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  • Arctic and Antarctic « RealClimate

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    Original URL path: /index.php/archives/category/climate-science/arctic-and-antarctic/ (2016-02-13)


  • Carbon cycle « RealClimate

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    Original URL path: /index.php/archives/category/climate-science/carbon-cycle/ (2016-02-13)


  • El Nino « RealClimate
    1998 2005 and La Niña events like the relatively cool 2011 A very consistent understanding is thus emerging of the coupled ocean and atmosphere dynamics that have caused the recent decadal scale departure from the longer term global warming trend That understanding suggests that the slowdown in warming is unlikely to continue as England explains in his guest post below Eric Steig Guest commentary by Matthew England UNSW For a long time now climatologists have been tracking the global average air temperature as a measure of planetary climate variability and trends even though this metric reflects just a tiny fraction of Earth s net energy or heat content But it s used widely because it s the metric that enjoys the densest array of in situ observations The problem of course is that this quantity has so many bumps and kinks pauses and accelerations that predicting its year to year path is a big challenge Over the last century no single forcing agent is clearer than anthropogenic greenhouse gases yet zooming into years or decades modes of variability become the signal not the noise Yet despite these basics of climate physics any slowdown in the overall temperature trend sees lobby groups falsely claim that global warming is over Never mind that the globe our planet spans the oceans atmosphere land and ice systems in their entirety This was one of the motivations for our study out this week in Nature Climate Change England et al 2014 With the global average surface air temperature SAT more or less steady since 2001 scientists have been seeking to explain the climate mechanics of the slowdown in warming seen in the observations during 2001 2013 One simple way to address this is to examine what is different about the recent decade compared to the preceding decade when the global mean SAT metric accelerated This can be quantified via decade mean differences or via multi decadal trends which are roughly equivalent if the trends are more or less linear or if the focus is on the low frequency changes More References G Foster and S Rahmstorf Global temperature evolution 1979 2010 Environ Res Lett vol 6 pp 044022 2011 http dx doi org 10 1088 1748 9326 6 4 044022 M A Balmaseda K E Trenberth and E Källén Distinctive climate signals in reanalysis of global ocean heat content Geophys Res Lett vol 40 pp 1754 1759 2013 http dx doi org 10 1002 grl 50382 M H England S McGregor P Spence G A Meehl A Timmermann W Cai A S Gupta M J McPhaden A Purich and A Santoso Recent intensification of wind driven circulation in the Pacific and the ongoing warming hiatus Nature Climate Change vol 4 pp 222 227 2014 http dx doi org 10 1038 nclimate2106 Comments pop up 95 The global temperature jigsaw Filed under Aerosols Climate modelling Climate Science El Nino Instrumental Record Oceans statistics stefan 17 December 2013 Since 1998 the global temperature has risen more slowly

    Original URL path: http://www.realclimate.org/index.php/archives/category/climate-science/el-nino/ (2016-02-13)
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  • Geoengineering « RealClimate
    is that they base their analysis only on their own quantifications of the costs and benefits of different strategies In this report discussed below they simply omit the costs of many of the potential negative aspects of producing a stratospheric cloud to block out sunlight or cloud brightening and come to the conclusion that these strategies have a 25 5000 to 1 benefit cost ratio That the second author works for the American Enterprise Institute a lobbying group that has been a leading global warming denier is not surprising except that now they are in favor of a solution to a problem they have claimed for years does not exist More Comments pop up 329 Climate change methadone Filed under Aerosols Climate modelling Climate Science Geoengineering gavin 20 August 2008 Geoengineering is increasingly being discussed not so sotto voce any more in many forums The current wave of interest has been piqued by Paul Crutzen s 2005 editorial and a number of workshops commentary and high profile advocacy But most of the discussion has occurred in almost total ignorance of the consequences of embarking on such a course A wider range of people have now started to publish relevant studies showing clearly the value of continued research on the topic and a key one came out this week in JGR Atmospheres Robock et al used a coupled GCM with interactive aerosols to see what would happen if they injected huge amounts of SO 2 the precursor of sulphate aerosols into the tropical or Arctic stratosphere This is the most talked about and most feasible geoengineering idea based on the cooling impacts of large tropical volcanic eruptions like Mt Pinatubo in 1991 Bottom line This is no panacea More Comments pop up 145 Thin Soup and a Thin Story Filed under Climate Science Geoengineering david 2 May 2007 A firm called planktos com is getting a lot of airplay for their bid to create a carbon offset product based on fertilizing the ocean In certain parts of the ocean surface waters already contain most of the ingredients for a plankton bloom all they lack is trace amounts of iron For each 1 atom of iron added in such a place phytoplankton take up 50 000 atoms of carbon What could be better More Comments pop up 137 Older Entries Site Google Custom Search Recent Comments What is the best description of the greenhouse effect Patrick Eriksson What is the best description of the greenhouse effect Kevin McKinney Anti scientists Carbomontanus What is the best description of the greenhouse effect Spencer Marvel et al 2015 Part III Response to Nic Lewis SteveS What is the best description of the greenhouse effect Chris Colose Blizzard Jonas and the slowdown of the Gulf Stream System doiknow What is the best description of the greenhouse effect James Powell Unforced Variations Feb 2016 Jim Galasyn What is the best description of the greenhouse effect Jack Barrett With Inline Responses Marvel et al 2015 Part III Response

    Original URL path: http://www.realclimate.org/index.php/archives/category/climate-science/geoengineering/ (2016-02-13)
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