Deuterium excess in Greenland snow: Analysis with simple and complex models

被引:48
作者
Armengaud, A [1 ]
Koster, RD
Jouzel, J
Ciais, P
机构
[1] Univ Grenoble 1, CNRS, Lab Glaciol & Geophys Environm, F-38402 St Martin Dheres, France
[2] NASA, Goddard Space Flight Ctr, Hydrol Sci Branch, Lab Hydrospher Proc, Greenbelt, MD 20771 USA
[3] CEA Saclay, Lab Sci Climat & Environm, DSM, Commissariat Energie Atom, F-91191 Gif Sur Yvette, France
关键词
D O I
10.1029/98JD00274
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
A simple Rayleigh-type isotope model, typical of those used to develop algorithms for extracting climatic information from stable water isotope paleodata, is evaluated against the more complex and presumably more reliable calculations of a general circulation model (GCM) fitted with isotope tracer diagnostics. The evaluation centers on an analysis of how the temperature T-e of an oceanic moisture source affects the deuterium excess d of Greenland precipitation. The annual T-e-d relationship derived from the GCM diagnostics is largely reproduced by the simple isotope model when the latter is properly initialized. This, coupled with the fact that the GCM itself reproduces observed isotope behavior, suggests that the simpler model's atmospheric calculations are indeed adequate for isotope studies. Furthermore, the GCM results support the idea, originally developed with the simpler models, that polar deuterium excess values contain information on meteorological conditions at distant evaporative sources.
引用
收藏
页码:8947 / 8953
页数:7
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