期刊
SCIENCE
卷 325, 期 5946, 页码 1374-1377出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1173791
关键词
-
资金
- Deutsche Forschungsgemeinschaft through project RISOTO
- Dutch science foundation NWO
The hydrological cycle and its response to environmental variability such as temperature changes is of prime importance for climate reconstruction and prediction. We retrieved deuterated water/water (HDO/H2O) abundances using spaceborne absorption spectroscopy, providing an almost global perspective on the near-surface distribution of water vapor isotopologs. We observed an unexpectedly high HDO/H2O seasonality in the inner Sahel region, pointing to a strong isotopic depletion in the subsiding branch of the Hadley circulation and its misrepresentation in general circulation models. An extension of the analysis at high latitudes using ground-based observations of (delta D) over bar and a model study shows that dynamic processes can entirely compensate for temperature effects on the isotopic composition of precipitation.
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