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  • February « 2005 « RealClimate
    given that there is no actual paper yet More Comments pop up 30 Dummies guide to the latest Hockey Stick controversy Filed under Climate Science FAQ Paleoclimate gavin 18 February 2005 by Gavin Schmidt and Caspar Amman Due to popular demand we have put together a dummies guide which tries to describe what the actual issues are in the latest controversy in language even our parents might understand A pdf version is also available More technical descriptions of the issues can be seen here and here This guide is in two parts the first deals with the background to the technical issues raised by McIntyre and McKitrick 2005 MM05 while the second part discusses the application of this to the original Mann Bradley and Hughes 1998 MBH98 reconstruction The wider climate science context is discussed here and the relationship to other recent reconstructions the Hockey Team can be seen here NB All the data that were used in MBH98 are freely available for download at ftp holocene evsc virginia edu pub sdr temp nature MANNETAL98 and also as supplementary data at Nature along with a thorough description of the algorithm More Comments pop up 39 People in people out Filed under Climate Science gavin 18 February 2005 This is just to note some personnel changes at RealClimate Amy Clement is unfortunately too overcommitted to be able to participate as much as she would like and so is dropping out of the team She states I fully support what the contributors of RealClimate are doing It is a real service to both the community of climate scientists and to the general public To balance that we welcome aboard paleoceanographer Thibault de Garidel Rutgers who some francophiles may have noticed has been helping organise the French translations of some of the posts And of course if there are any other scientists out there who d like to contribute we would love to hear from you Comments pop up 1 Older Entries Site Google Custom Search Recent Comments What is the best description of the greenhouse effect Jim Eager 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 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

    Original URL path: http://www.realclimate.org/index.php/archives/2005/02/ (2016-02-13)
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  • January « 2005 « RealClimate
    24 January 2005 Guest Contribution by Juerg Luterbacher University of Bern Switzerland While the anomalous nature of recent trends in global average temperature is often highlighted in discussions of climate change changes at regional scales have potentially greater societal significance Of particular interest for example is the possible relationship between climate change and the incidence of summer heat waves Meehl G A and C Tebaldi Science 305 994 997 2004 such as those observed in Europe during summer 2003 see Schaer et al Nature 427 332 336 2004 Stott et al Nature 432 610 614 2004 Preliminary analyses of the annual mean surface air temperatures for Europe for 2004 show it be among the few warmest though not as warm as 1989 1990 and 1999 2003 since widespread instrumental records have been kept roughly the past 150 years 2004 exceeded the reference period 1961 1990 mean temperature by more than 0 8 C The largest deviations were found over Northern and Eastern Europe Every single month of 2004 contributed to the overall warmth February April August October and December were all more than 1 C warmer than the 1961 1990 period Annual mean European surface air temperatures have increased by around 0 85 C over the last 100 years The upward trend has accelerated in recent decades with about 1 2 C of warming taking place over the past 30 years 1975 to 2004 Indeed the last thirty years likely represent the warmest multidecadal period for Europe in at least the past half millennium Luterbacher J Dietrich D Xoplaki E Grosjean M and H Wanner Science 303 1499 1503 2004 while the last decade 1995 2004 is likely the warmest decade and summer 2003 the warmest summer These conclusions are similar to those reached for the entire Northern Hemisphere on the whole Comments pop up 14 Peer Review A Necessary But Not Sufficient Condition Filed under Climate Science Instrumental Record Paleoclimate Sun earth connections group 20 January 2005 by Michael Mann and Gavin Schmidt On this site we emphasize conclusions that are supported by peer reviewed climate research That is research that has been published by one or more scientists in a scholarly scientific journal after review by one or more experts in the scientists same field peers for accuracy and validity What is so important about Peer Review As Chris Mooney has lucidly put it Peer Review is an undisputed cornerstone of modern science Central to the competitive clash of ideas that moves knowledge forward peer review enjoys so much renown in the scientific community that studies lacking its imprimatur meet with automatic skepticism Academic reputations hinge on an ability to get work through peer review and into leading journals university presses employ peer review to decide which books they re willing to publish and federal agencies like the National Institutes of Health use peer review to weigh the merits of applications for federal research grants More Comments pop up 31 Older Entries Site Google Custom Search Recent Comments

    Original URL path: http://www.realclimate.org/index.php/archives/2005/01/ (2016-02-13)
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  • December « 2004 « RealClimate
    Getting a serious paper into Nature or Science is deservedly hard Getting a mention for your climate blog is apparently a little easier We are of course collectively very pleased that Nature has welcomed the RealClimate org effort so forthrightly We only hope that we will be able to match up to their expectations As with anything new done by inexperienced first timers who really should be concentrating on their actual jobs there are bound to be teething problems One alluded to in the editorial and accompanying news story is who gets to decide what s posted and getting the balance right between inclusiveness and clarity More Comments pop up 10 How do we know that recent CO 2 increases are due to human activities Filed under Climate Science FAQ Greenhouse gases Paleoclimate eric 22 December 2004 Note This is an update to an earlier post which many found to be too technical The original and a series of comments on it can be found here See also a more recent post here for an even less technical discussion Over the last 150 years carbon dioxide CO 2 concentrations have risen from 280 to nearly 380 parts per million ppm The fact that this is due virtually entirely to human activities is so well established that one rarely sees it questioned Yet it is quite reasonable to ask how we know this More Comments pop up 11 Older Entries Site Google Custom Search Recent Comments What is the best description of the greenhouse effect Jim Eager 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 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

    Original URL path: http://www.realclimate.org/index.php/archives/2004/12/ (2016-02-13)
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  • November « 2004 « RealClimate
    General Circulation Model GCM Comments Off on Atmosphere Ocean General Circulation Model AOGCM Older Entries Site Google Custom Search Recent Comments What is the best description of the greenhouse effect Jim Eager 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 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

    Original URL path: http://www.realclimate.org/index.php/archives/2004/11/ (2016-02-13)
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  • RealClimate » Blog Archive » A simple recipe for GHE
    tell us what we can expect but it is also useful to have an idea of why increased greenhouse gas concentrations result in higher surface temperatures The saying Everything should be made as simple as possible but not simpler has been attributed to Albert Einstein which also makes me wonder if we the scientists need to reiterate the story of climate change in a different way Gavin has already discussed this also see here and here but it may be necessary to tell story over again with a slightly different slant So how can we explain how the greenhouse effect GHE work in both simple terms and with a new angle I also want to explain why the middle atmosphere cools with increasing greenhouse gas concentrations associated with an increased GHE Here I will try to present a conceptual and comprehensive picture of GHE explaining both the warming in the lower part of the atmosphere as well as the cooling aloft and where only the most central features are included Also it is important to provide a good background and we need to start with some very fundamental facts Four main physical aspects Several factors are involved and hence it may be useful to write a simple recipe for the GHE This recipe then involves four main ingredients i the relationship between temperature and light ii the planetary energy balance iii the distance light travels before being absorbed and iv the relationship between temperature and altitude i Temperature and light Energy can be transmitted in many different ways involving photons light or electromangetic radiation conduction and motion Most of these require a medium such as a gas fluid or a solid but space is basically a void through which photons represent virtually the only form for energy transfer Hence planets

    Original URL path: http://www.realclimate.org/index.php/archives/2010/07/a-simple-recipe-for-ghe/ (2016-02-13)
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  • RealClimate » Blog Archive » The Key to the Secrets of the Troposphere
    air currents and its eventual escape into space is delayed by greenhouse gases emphasis added Given your recent excellent explanation of the real physics on RC I thought you might be interested It s downright disturbing that this silliness comes from such an important source and I ve found it repeated all over the place On that RC post I would humbly suggest that the section on stratospheric cooling could helpfully be expanded to make that clearer I won t discuss the stratospheric cooling now but rather try to place recent events including floods in Niger which involve the hydrological cycle and atmospheric circulation into the framework from my previous post A simple recipe for GHE Again it can be useful to stop and contemplate whether a simple conceptual framework can provide greater understanding of climate model predictions and the observations we make on the climate system I think that there are not too many simple descriptions as Wood pointed out that are convincing in terms of physics Can we use such simple conceptual explanations for events such as the recent spate of extreme rainfall and heat waves then I want to stress as we did when discussing tropical cyclones that single events do not constitute evidence of a climate change Since climate can be defined as typical weather pattern or weather statistics then climate change can be that extremes become more or less typical and such change must start with a few events This touches the difference between weather and climate and each of these events can be considered as weather But there is a connection between these weather events and results obtained from climate models There are fascinating as well as disconcerting sides to the fact that global climate models reported in the IPCC AR4 suggest warming in

    Original URL path: http://www.realclimate.org/index.php/archives/2010/08/the-key-to-the-secrets-of-the-troposphere/ (2016-02-13)
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  • Comment policy « RealClimate
    credits All comments are assumed to be released into the public domain Comments generally close after a month Repeat violators of our comments policy in particular individuals demonstrating a pattern of trolling may be barred from future access to the blog revised 01 06 11 Comments Off on Comment policy Comments are closed Site Google Custom Search Recent Comments What is the best description of the greenhouse effect Jim Eager 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 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

    Original URL path: http://www.realclimate.org/index.php/archives/2004/12/comment-policy/ (2016-02-13)
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  • RealClimate » Blog Archive » What is the best description of the greenhouse effect?
    OLR becomes more diffuse and less similar to the temperature pattern at the surface An analysis of spatial correlation between heat radiation estimated for the surface temperatures and that at the top of the atmosphere suggests that the OLR has become more diffuse over time The depth in the atmosphere from which the earth s heat loss to space takes place is often referred to as the emission height For simplicity we can assume that the emission height is where the temperature is 254K in order for the associated black body radiation to match the incoming flow of energy from the sun Additionally as the infrared light which makes up the OLR is subject to more absorption with higher concentrations of greenhouse gases Beer Lambert s law the mean emission height for the OLR escaping out to space must increase as the atmosphere gets more opaque There has been an upward trend in the simple proxy for the emission height in the reanalyses This trend seems to be consistent with the surface warming with the observed lapse rate approximately 5K km on a global scale One caveat is however that trends in reanalyses may be misleading due to introduction of new observational instruments over time Thorne Vose 2010 Finally the energy flow from the surface to the emission height must be the same as the total OLR emitted back to space and if increased absorption inhibits the radiative flow between earth s surface and the emission height then it must be compensated by other means The energy flow is like the water in a river it cannot just appear or disappear it flows from place to place In this case the vertical energy flow is influenced by deep convection which also plays a role in maintaining the lapse rate A

    Original URL path: http://www.realclimate.org/index.php/archives/2016/02/what-is-the-best-description-of-the-greenhouse-effect/%5C (2016-02-13)
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