A MODEL STUDY OF THE ATLANTIC THERMOHALINE CIRCULATION DURING THE LAST GLACIAL MAXIMUM

被引:59
作者
FICHEFET, T [1 ]
HOVINE, S [1 ]
DUPLESSY, JC [1 ]
机构
[1] CEA,CNRS LAB,CTR FAIBLES RADIOACT,F-91198 GIF SUR YVETTE,FRANCE
关键词
D O I
10.1038/372252a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
STABLE isotope measurements in deep-sea sediment cores have indicated that the Atlantic thermohaline circulation experienced significant changes during the last glacial maximum: the North Atlantic Deep Water (NADW) was shallower than today and the Antarctic Bottom Water (AABW) penetrated much farther north(1-6). Numerical ocean models have, so far, been unable to simulate these circulation changes realistically(7). Here we show that a zonally averaged, three-basin ocean model, driven by glacial boundary conditions(8-10), reproduces the main trends of the geochemically constrained glacial Atlantic circulation. In addition, we provide quantitative estimates of the meridional water transport during glacial times. Our results suggest that the glacial production of AABW was slightly higher than at present, whereas that of NADW was reduced by similar to 40%, resulting in an intermediate circulation cell which closed within the Atlantic basin. We also show that the strength of the Atlantic conveyor belt strongly depends on the surface density contrast between the high latitudes of the Northern and Southern hemispheres.
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页码:252 / 255
页数:4
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