globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-11-00416.1
Scopus记录号: 2-s2.0-84874849545
论文题名:
Sensitivity to glacial forcing in the CCSM4
作者: Brady E.C.; Otto-bliesner B.L.; Kay J.E.; Rosenbloom N.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期:6
起始页码: 1901
结束页码: 1925
语种: 英语
Scopus关键词: Antarctic Bottom Water ; Atlantic meridional overturning circulations ; Climate change simulations ; Community climate system model ; Coupled Model Intercomparison Project ; Intergovernmental panel on climate changes ; North Atlantic Deep Water ; Sensitivity Simulation ; Atmospheric aerosols ; Atmospheric radiation ; Atmospheric temperature ; Carbon dioxide ; Climate change ; Climate models ; Glacial geology ; Greenhouse gases ; Precipitation (meteorology) ; Sea level ; Computer simulation ; Antarctic Bottom Water ; boundary condition ; carbon dioxide ; climate modeling ; climate variation ; El Nino-Southern Oscillation ; greenhouse gas ; ice sheet ; Last Glacial Maximum ; meridional circulation ; North Atlantic Deep Water ; overturn ; paleoclimate ; precipitation (climatology) ; radiative forcing ; sea level ; sea surface temperature ; surface temperature ; Pacific Ocean ; Pacific Ocean (East)
英文摘要: Results are presented from the Community Climate System Model, version 4 (CCSM4), simulation of the Last Glacial Maximum (LGM) from phase 5 of the Coupled Model Intercomparison Project (CMIP5) at the standard 18 resolution, the same resolution as the majority of the CCSM4 CMIP5 long-term simulations for the historical and future projection scenarios. The forcings and boundary conditions for this simulation follow the protocols of the Paleoclimate Modeling Intercomparison Project, version 3 (PMIP3). Two additional CCSM4 CO2 sensitivity simulations, in which the concentrations are abruptly changed at the start of the simulation to the low 185 ppm LGM concentrations (LGMCO2) and to a quadrupling of the preindustrial concentration (4×CO2), are also analyzed. For the full LGM simulation, the estimated equilibriumcooling of the global mean annual surface temperature is 5.5°C with an estimated radiative forcing of -6.2 W m-2. The radiative forcing includes the effects of the reduced LGM greenhouse gases, ice sheets, continental distribution with sea level lowered by approximately 120 m from the present, and orbital parameters, but not changes to atmospheric aerosols or vegetation biogeography. The LGM simulation has an equilibrium climate sensitivity (ECS) of 3.1(±0.3)°C, comparable to the CCSM4 4×CO2 result. The LGMCO2 simulation shows a greater ECS of 4.2°C. Other responses found at the LGM in CCSM4 include a global precipitation rate decrease at a rate of ~2% °C-1, similar to climate change simulations in the Intergovernmental Panel on Climate Change Fourth Assessment Report (IPCC AR4); a strengthening of the Atlantic meridional overturning circulation (AMOC) with a shoaling of North Atlantic Deep Water and a filling of the deep basin up to sill depth with Antarctic Bottom Water; and an enhanced seasonal cycle accompanied by reduced ENSO variability in the eastern Pacific Ocean,s SSTs. © 2013 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51947
Appears in Collections:气候变化事实与影响

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作者单位: National Center for Atmospheric Research, Boulder, CO, United States

Recommended Citation:
Brady E.C.,Otto-bliesner B.L.,Kay J.E.,et al. Sensitivity to glacial forcing in the CCSM4[J]. Journal of Climate,2013-01-01,26(6)
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