Final Report for DOE contract DE-FG02-98ER62609

doi:10.2172/1048699

GSTDTAP > 地球科学

DOI	10.2172/1048699
报告编号	DOE/ER/62609-1 Final Report
来源ID	OSTI ID: 1048699
	Final Report for DOE contract DE-FG02-98ER62609
	Webb, Thompson, III
	2012-08-20
出版年	2012
页数	6
语种	英语
国家	美国
领域	地球科学
英文摘要	Several publications document, analyze, and map the paleoclimatic data available for the last glacial maximum (LGM) 21,000 years ago. Data coverage is fairly extensive for North America, Eurasia, and Africa. The data show much lower temperatures for that time in earth history. These data were used to check climate model simulations for the LGM. Simulations forced by the CLIMAP SST for the LGM, where the west/east SST gradient across the Pacific is reduced compared to present, produce a reduction in the strength of the trade winds and a decrease in the west/east slope of the equatorial thermocline that is incompatible with thermocline depths newly inferred from foraminiferal assemblages. Stronger than-present trade winds, and a more realistic simulation of the thermocline slope, are produced when eastern Pacific SSTs are 2oC cooler than western Pacific SSTs. Sensitivity experiments for the model simulations of the LGM were also used to show which aspects of the climate boundary conditions produced various changes in model simulations for the LGM. An experiment which has the LGM ice sheets for the Northern Hemisphere but no Eurasian ice sheet shows that the downstream cooling in Asia is largely dependent on sea-ice growth in the North Atlantic, which is a product of the Laurentide ice sheet. Weaker Asian monsoons develop as a result of this downstream cooling, which is largest for low Laurentide ice sheets of large areal extent.
英文关键词	Climate Models Paleoclimatic Data Climate Model Testing NCAR Community Climate Model Sensitivity Experiments
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/5684
专题	地球科学
推荐引用方式 GB/T 7714	Webb, Thompson, III. Final Report for DOE contract DE-FG02-98ER62609,2012.