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Simulations of the HDO and H 2 18 O atmospheric cycles using the NASA GISS general circulation model: The seasonal cycle for present‐day conditions

1987; American Geophysical Union; Volume: 92; Issue: D12 Linguagem: Inglês

10.1029/jd092id12p14739

2156-2202

J. Jouzel, Gary L. Russell, R. Suozzo, Randal D. Koster, James W. C. White, Wallace S. Broecker,

Atmospheric and Environmental Gas Dynamics

The cycles of the water isotopic species (HDO and H 2 18 O) have been incorporated into the NASA Goddard Institute for Space Studies (GISS) atmospheric general circulation model (GCM). The results of a 3‐year simulation for present‐day conditions are discussed, with special emphasis on the comparison between predicted and observed isotopic distributions (well documented mainly through the International Atomic Energy Agency/World Meteorological Organization network) for both the seasonal and annual time scales. The observed seasonal cycles are generally well simulated. For the annual scale the observed linear relationship between δ 18 O and the surface temperature at middle and high latitudes, as well as the absence of any correlation between these fields in tropical and equatorial regions, are properly obeyed by the GCM simulation. In the tropical and equatorial regions the δ 18 O patterns for both observations and the GCM are influenced by the amount of rainfall. There is excellent agreement between the simulated and observed δD–δ 18 O relationship throughout the world.