Explaining the eventual transient saturation of climate-carbon cycle feedback
Tóm tắt
Coupled climate-carbon cycle simulations generally show that climate feedbacks amplify the buildup of CO2 under respective anthropogenic emission. The effect of climate-carbon cycle feedback is characterised by the feedback gain: the relative increase in CO2 increment as compared to uncoupled simulations. According to the results of the recent Coupled Climate-Carbon Cycle Model Intercomparison Project (C4MIP), the gain is expected to increase during the 21st century. This conclusion is not supported by the climate model developed at the A.M. Obukhov Institute of Atmospheric Physics at the Russian Academy of Sciences (IAP RAS CM). The latter model shows an eventual transient saturation of the feedback gain. This saturation is manifested in a change of climate-carbon cycle feedback gain which grows initially, attains a maximum, and then decreases, eventually tending to unity. Numerical experiments with the IAP RAS CM as well as an analysis of the conceptual framework demonstrate that this eventual transient saturation results from the fact that transient climate sensitivity decreases with time. One may conclude that the eventual transient saturation of the climate-carbon cycle feedback is a fundamental property of the coupled climate-carbon system that manifests itself on a relevant time scale.
Tài liệu tham khảo
Cox P, Betts R, Jones C, Spall S, Totterdell I: Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model. Nature 2000, 408: 184–187. 10.1038/35041539
Friedlingstein P, Bopp L, Ciais P, Dufresne JL, Fairhead L, Le Treut H, Monfray P, Orr J: Positive feedback between future climate change and the carbon cycle. Geophys Res Lett 2001,28(8):1543–1546. 10.1029/2000GL012015
Brovkin V, Bendtsen J, Claussen M, Ganopolski A, Kubatzki C, Petoukhov V, Andreev A: Carbon cycle, vegetation, and climate dynamics in the Holocene: Experiments with the CLIMBER-2 model. Glob Biogeochem Cycles 2002,16(4):1139. 10.1029/2001GB001662
Brovkin V, Sitch S, von Bloh W, Claussen M, Bauer E, Cramer W: Role of land cover changes for atmospheric CO 2 increase and climate change during the last 150 years. Glob Change Biol 2004, 10: 1253–1266. 10.1111/j.1365-2486.2004.00812.x
Friedlingstein P, Dufresne JL, Cox P, Rayner P: How positive is the feedback between climate change and the carbon cycle? Tellus 2003,55B(2):692–700.
Jones C, Cox P, Essery R, Roberts D, Woodage M: Strong carbon cycle feedbacks in a climate model with interactive CO 2 and sulphate aerosols. Geophys Res Lett 2003,30(9):1479. 10.1029/2003GL016867
Matthews H, Weaver A, Meissner K, Gillett N, Eby M: Natural and anthropogenic climate change: incorporating historical land cover change, vegetation dynamics and the global carbon cycle. Clim Dyn 2004, 22: 461–479. 10.1007/s00382-004-0392-2
Matthews H, Weaver A, Meissner K: Terrestrial carbon cycle dynamics under recent and future climate change. J Climate 2005,18(10):1609–1628. 10.1175/JCLI3359.1
Govindasamy B, Thompson S, Mirin A, Wickett M, Caldeira K, Delire C: Increase of carbon cycle feedback with climate sensitivity: results from a coupled climate and carbon cycle model. Tellus 2005,57B(2):153–163.
Mokhov I, Eliseev A, Karpenko A: Sensitivity of the IAP RAS Global Climatic Model with an interactive carbon cycle to anthropogenic influence. Doklady Earth Sci 2006,407(3):424–428. 10.1134/S1028334X06030172
Eliseev A, Mokhov I, Karpenko A: Climate and carbon cycle variations in the 20th and 21st centuries in a model ofintermediate complexity. Izvestiya, Atmos Ocean Phys 2007, 43: 1–14. 10.1134/S000143380701001X
Eliseev A, Mokhov I: Carbon cycle-climate feedback sensitivity to parameter changes of a zero-dimensional terrestrial carbon cycle scheme in a climate model of intermediate complexity. Theor Appl Climatol 2007,89(1–2):9–24. 10.1007/s00704-006-0260-6
Bala G, Caldeira K, Mirin A, Wickett M, Delire C: Multicentury changes to the global climate and carbon cycle: Results from a coupled climate and carbon cycle model. J Climate 2005,18(21):4531–4544. 10.1175/JCLI3542.1
Friedlingstein P, Cox P, Betts R, Bopp L, von Bloh W, Brovkin V, Doney S, Eby M, Fung I, Govindasamy B, John J, Jones C, Joos F, Kato T, Kawamiya M, Knorr W, Lindsay K, Matthews H, Raddatz T, Rayner P, Reick C, Roeckner E, Schnitzler KG, Schnur R, Strassmann K, Weaver A, Yoshikawa C, Zeng N: Climate-carbon cycle feedback analysis: Results from the C4MIP model intercomparison. J Climate 2006,19(22):3337–3353. 10.1175/JCLI3800.1
Mokhov I, Eliseev A, Karpenko A: Decadal-to-centennial scale climate-carbon cycle interactions from global climate models simulations forced by anthropogenic emissions. In Climate Change Research Progress. Edited by: Peretz L. Hauppauge, NY: Nova Publishers; 2008:in press.
Eliseev A, Mokhov I: Eventual saturation of the climate-carbon cycle feedback studied with a conceptual model. Ecol Mod 2008, 213: 127–132. 10.1016/j.ecolmodel.2007.11.015
Mokhov I, Eliseev A, Demchenko P, Khon V, Akperov M, Arzhanov M, Karpenko A, Tikhonov V, Chernokulsky A, Sigaeva E: Climate changes and their assessment based on the IAP RAS global model simulations. Doklady Earth Sci 2005,402(4):591–595.
Bacastow R: Numerical evaluation of the evasion factor. In Carbon Cycle Modelling, SCOPE-16. Edited by: Bolin B. N.Y.: J. Wiley and Sons; 1981:95–101.
Millero F: Thermodynamics of carbon dioxide system in the ocean. Geophys Cosmophys Acta 1995,59(4):661–677.
Marland G, Boden T, Andres R: Global, regional, and national CO2 emissions. In Trends: A Compendium of Data on Global Change. Oak Ridge, Tenn.: Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy; 2005.
Houghton J, Ding Y, Griggs D, Noguer M, Linden P, Dai X, Maskell K, Johnson C, (Eds): Climate Change 2001: The Scientific Basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge/New York: Cambridge University Press; 2001.
Gregory J, Stouffer R, Raper S, Stott P, Rayner N: An observationally based estimate of the climate sensitivity. J Climate 2002,15(22):3117–3121. Publisher Full Text 10.1175/1520-0442(2002)015<3117:AOBEOT>2.0.CO;2
Myhre G, Highwood E, Shine K, Stordal F: New estimates of radiative forcing due to well mixed greenhouse gases. Geophys Res Lett 1998,25(14):2715–2718. 10.1029/98GL01908
Andreae M, Jones C, Cox P: Strong present-day aerosol cooling implies a hot future. Nature 2005, 435: 1187–1190. 10.1038/nature03671
Harvey L, Kaufmann R: Simultaneously constraining climate sensitivity and aerosol radiative forcing. J Climate 2002,15(20):2837–2861. Publisher Full Text 10.1175/1520-0442(2002)015<2837:SCCSAA>2.0.CO;2
Stainforth D, Aina T, Christensen C, Collins M, Faull N, Frame D, Kettleborough J, Knight S, Martin A, Murphy J, Piani C, Sexton D, Smith L, Spicer R, Thorpe A, Allen M: Uncertainty in predictions of the climate response to rising levels of greenhouse gases. Nature 2005, 433: 403–406. 10.1038/nature03301
Forest C, Stone P, Sokolov A: Estimated PDFs of climate system properties including natural and anthropogenic forcings. Geophys Res Lett 2006, 33: L01705. 10.1029/2005GL023977
Hegerl G, Crowley T, Hyde W, DJ F: Climate sensitivity constrained by temperature reconstructions over the past seven centuries. Nature 2006, 440: 1029–1032. 10.1038/nature04679
Solomon S, Qin D, Manning M, Marquis M, Averyt K, Tignor M, LeRoy Miller H, Chen Z, (Eds): Climate Change 2007: The Physical Science Basis. Cambridge/New York: Cambridge University Press; 2007.
Archer D, Martin P, Buffett B, Brovkin V, Rahmstorf S, Ganopolski A: The importance of ocean temperature to global biogeochemistry. Earth Planet Sci Lett 2004,222(2):333–348. 10.1016/j.epsl.2004.03.011
Scheffer M, Brovkin V, Cox P: Positive feedback between global warming and atmospheric CO 2 concentration inferred from past climate change. Geophys Res Lett 2006,33(10):L10702. 10.1029/2005GL025044
Hansen J, Russell G, Lacis A, Fung I, Rind D, Stone P: Climate response times: dependence on climate sensitivity and ocean mixing. Science 1985,229(4716):857–859. 10.1126/science.229.4716.857
Harvey L: Effect of ocean mixing on the transient climate response to a CO 2 increase: analysis of recent model results. J Geophys Res 1986, 90: 2709–2718. 10.1029/JD091iD02p02709
Schlesinger M, Jiang X: Simple model representation of atmosphere-ocean GCMs and estimation of the time scale of CO 2 -induced climate change. J Climate 1990,3(12):1297–1315. Publisher Full Text 10.1175/1520-0442(1990)003<1297:SMROAO>2.0.CO;2
Raper S, Gregory J, Stouffer R: The role of climate sensitivity and ocean heat uptake on AOGCM transient temperature and thermal expansion response. J Climate 2002, 15: 124–130. Publisher Full Text 10.1175/1520-0442(2002)015<0124:TROCSA>2.0.CO;2