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Asymmetries in the moisture origin of Antarctic precipitation

Sodemann, Harald and Stohl, Andreas (2009) Asymmetries in the moisture origin of Antarctic precipitation. Geophysical Research Letters, 36 . Art. No. L22803. ISSN 0094-8276.

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The seasonality of moisture sources for precipitation in Antarctica is studied with a Lagrangian moisture source diagnostic. Moisture origin for precipitation in Antarctica has strongly asymmetric properties, which are related to the Antarctic topography, seasonal sea ice coverage, and the land/ocean contrasts in the mid-latitudes of the southern hemisphere. The highest altitudes of the East Antarctic ice shield, where major ice cores have been drilled, have mean source latitudes of 45–40°S year-round. This finding contrasts to results from previous Lagrangian studies which detected a more southerly moisture origin due to too short trajectories. Now, results from Lagrangian moisture source diagnostics are consistent with findings from general circulation models with tagged tracers. Thus, both approaches can serve as a common benchmark for the interpretation of moisture source indicators based on stable isotopes, such as deuterium excess, in Antarctic ice cores.

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Additional Information:© 2009 American Geophysical Union. Received 24 July 2009; accepted 15 October 2009; published 20 November 2009. Funding for this study has been provided by the Norwegian Research Council in the framework of the WaterSIP project. The Norwegian meteorological service is acknowledged for access to the ECMWF data.
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Norwegian Research CouncilUNSPECIFIED
Subject Keywords:moisture sources; Antarctica; seasonality
Record Number:CaltechAUTHORS:20091208-141655788
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Official Citation:Sodemann, H., and A. Stohl (2009), Asymmetries in the moisture origin of Antarctic precipitation, Geophys. Res. Lett., 36, L22803, doi:10.1029/2009GL040242.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16908
Deposited By: Tony Diaz
Deposited On:05 Jan 2010 19:19
Last Modified:03 Oct 2019 01:19

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