DOI: 10.5194/cp-9-789-2013
Scopus记录号: 2-s2.0-84881166777
论文题名: Influence of last glacial maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model
作者: Tharammal T. ; Paul A. ; Merkel U. ; Noone D.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 2 起始页码: 789
结束页码: 809
语种: 英语
Scopus关键词: bioindicator
; boundary condition
; environmental factor
; general circulation model
; greenhouse gas
; ice sheet
; isotopic analysis
; Last Glacial Maximum
; Northern Hemisphere
; oxygen isotope
; precipitation (climatology)
; proxy climate record
; sea surface temperature
; topography
; North America
英文摘要: To understand the validity of 18O proxy records as indicators of past temperature change, a series of experiments was conducted using an atmospheric general circulation model fitted with water isotope tracers (Community Atmosphere Model version 3.0, IsoCAM). A pre-industrial simulation was performed as the control experiment, as well as a simulation with all the boundary conditions set to Last Glacial Maximum (LGM) values. Results from the preindustrial and LGM simulations were compared to experiments in which the influence of individual boundary conditions (greenhouse gases, ice sheet albedo and topography, sea surface temperature (SST), and orbital parameters) were changed each at a time to assess their individual impact. The experiments were designed in order to analyze the spatial variations of the oxygen isotopic composition of precipitation (18Oprecip) in response to individual climate factors. The change in topography (due to the change in land ice cover) played a significant role in reducing the surface temperature and 18Oprecip over North America. Exposed shelf areas and the ice sheet albedo reduced the Northern Hemisphere surface temperature and 18Oprecip further. A global mean cooling of 4.1 C was simulated with combined LGM boundary conditions compared to the control simulation, which was in agreement with previous experiments using the fully coupled Community Climate System Model (CCSM3). Large reductions in 18Oprecip over the LGM ice sheets were strongly linked to the temperature decrease over them. The SST and ice sheet topography changes were responsible for most of the changes in the climate and hence the 18Oprecip distribution among the simulations. © 2013 Author(s). 资助项目: DFG, Deutsche Forschungsgemeinschaft
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49441
Appears in Collections: 气候变化与战略
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Recommended Citation:
Tharammal T.,Paul A.,Merkel U.,et al. Influence of last glacial maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model[J]. Climate of the Past,2013-01-01,9(2)