REDUCTION OF DEEP-WATER FORMATION IN THE GREENLAND SEA DURING THE 1980S - EVIDENCE FROM TRACER DATA

被引:157
作者
SCHLOSSER, P
BONISCH, G
RHEIN, M
BAYER, R
机构
[1] UNIV HEIDELBERG,INST UMWELTPHYS,W-6900 HEIDELBERG,GERMANY
[2] COLUMBIA UNIV,DEPT GEOL SCI,PALISADES,NY 10964
[3] UNIV KIEL,INST MEERESKUNDE,W-2300 KIEL 1,GERMANY
关键词
D O I
10.1126/science.251.4997.1054
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
Hydrographic observations and measurements of the concentrations of chlorofluorocarbons (CFCs) have suggested that the formation of Greenland Sea Deep Water (GSDW) slowed down considerably during the 1980s. Such a decrease is related to weakened convection in the Greenland Sea and thus could have significant impact on the properties of the waters flowing over the Scotland-Iceland-Greenland ridge system into the deep Atlantic. Study of the variability of GSDW formation is relevant for understanding the impact of the circulation in the European Polar seas on regional and global deep water characteristics. New long-term multitracer observations from the Greenland Sea show that GSDW formation indeed was greatly reduced during the 1980s. A box model of deepwater formation and exchange in the European Polar seas tuned by the tracer data indicates that the reduction rate of GSDW formation was about 80 percent and that the start date of the reduction was between 1978 and 1982.
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页码:1054 / 1056
页数:3
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