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FRANKENBERG, Christian; YOSHIMURA, Kei; SCHRIJVER, Hans; ROCKMANN, Thomas; WARNEKE, Thorsten; ABEN, Ilse; BUTZ, André; DEUTSCHER, Nicholas; GRIFFITH, David; HASE, Frank; NOTHOLT, Justus; SCHNEIDER, Matthias
Science (American Association for the Advancement of Science), 09/2009, Volume: 325, Issue: 5946Journal Article
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 deltaD and a model study shows that dynamic processes can entirely compensate for temperature effects on the isotopic composition of precipitation.
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