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The Origin of Antarctic Precipitation: A Modeling Approach
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In this article, the contribution of different moisture sources to Antarctic precipitation for present-day and glacial conditions is estimated with the NASA/GISS Atmospheric General Circulation Model with the low horizontal resolution (8°×10°).Abstract:
The contribution of different moisture sources to Antarctic precipitation for present-day and glacial conditions is estimated with the NASA/GISS Atmospheric General Circulation Model. Despite its low horizontal resolution (8°×10°), this model simulates reasonably well the broad features of the observed present-day hydrological cycle. Simulated present-day Antarctic precipitation is dominated throughout the year by moisture from a subtropical/midlatitude band (30°S−60°S). The moisture supplied to a given coastal area of Antarctica originates mostly in the adjacent oceanic basin; closer to the pole, other oceanic basins can also contribute significantly. Replacing the present-day sea surface temperatures (SSTs) and sea ice cover in the GCM with those from the CLIMAP oceanic reconstruction for the last glacial maximum (LGM), greatly increases the simulated latitudinal temperature gradient, with the consequence of slightly enhancing the contribution of low latitude moisture to Antarctic precipitation. It also changes the seasonality of the different contributions and thus their budget, particularly in coastal regions. Because the nature of LGM tropical SSTs is still under debate, we performed an additional LGM simulation in which the tropical SSTs are reduced relative to those of CLIMAP. The resulting decrease in the latitudinal gradient brings the relative contributions to Antarctic precipitation more in line with those of the present-day simulation. DOI: 10.1034/j.1600-0889.2000.00951.xread more
Citations
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Sea-level and deep water temperature changes derived from benthic foraminifera isotopic records
Claire Waelbroeck,Laurent Labeyrie,Laurent Labeyrie,Elisabeth Michel,Jean-Claude Duplessy,Jerry F. McManus,Kurt Lambeck,Estelle Balbon,Monique Labracherie +8 more
TL;DR: In this paper, robust regressions were established between relative sea-level (RSL) data and benthic foraminifera oxygen isotopic ratios from the North Atlantic and Equatorial Pacific Ocean over the last climatic cycle.
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A Review of Antarctic Surface Snow Isotopic Composition : Observations, Atmospheric Circulation, and Isotopic Modeling
Valérie Masson-Delmotte,Shugui Hou,Alexey A. Ekaykin,Jean Jouzel,Alberto J. Aristarain,Ronaldo T. Bernardo,David H. Bromwich,Olivier Cattani,Marc Delmotte,S. Falourd,Massimo Frezzotti,Hubert Gallée,L. Genoni,Elisabeth Isaksson,Amaelle Landais,Amaelle Landais,M. M. Helsen,George R. Hoffmann,J. Lopez,Vin Morgan,Hideaki Motoyama,David Noone,H. Oerter,J. R. Petit,A. Royer,Ryu Uemura,Gavin A. Schmidt,Elisabeth Schlosser,Jefferson Cardia Simões,Eric J. Steig,Barbara Stenni,Michel Stievenard,M. R. van den Broeke,R. S. W. van de Wal,W. J. van de Berg,Françoise Vimeux,James W. C. White +36 more
TL;DR: In this article, a database of surface Antarctic snow isotopic composition is constructed using available measurements, with an estimate of data quality and local variability, and the capacity of theoretical isotopic, regional, and general circulation atmospheric models to reproduce the observed features and assess the role of moisture advection in spatial deuterium excess fluctuations.
Journal ArticleDOI
Glacial–interglacial changes in ocean surface conditions in the Southern Hemisphere
TL;DR: In this article, a deuterium-excess history obtained from ice cores from Vostok, East Antarctica, spanning the full glacial-interglacial cycle of the past 150,000 years is presented.
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Homogeneous climate variability across East Antarctica over the past three glacial cycles
Okitsugu Watanabe,Jean Jouzel,Sigfus J Johnsen,Sigfus J Johnsen,Frédéric Parrenin,Hitoshi Shoji,Naohiro Yoshida +6 more
TL;DR: An isotopic profile from a core drilled at Dome Fuji indicates that Antarctic climate is essentially homogeneous at the scale of the East Antarctic Plateau, possibly as a consequence of the symmetry of the plateau and the adjacent ocean.
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``Amount effect'' of water isotopes and quantitative analysis of post-condensation processes
Jung-Eun Lee,Inez Fung +1 more
TL;DR: In this article, a numerical model is proposed that describes the interaction between raindrops and water vapour near the planetary boundary layer to explain the amount effect, which relates the intensity to the isotopic composition of precipitation.
References
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