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标题：Atmospheric influence on the deuterium excess signal in polar firn: implications for ice-core interpretation
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作者：Elisabeth Schlosser ; Hans Oerter ; Valerie Masson-Delmotte 等
期刊名称：Journal of Glaciology
印刷版ISSN：0022-1430
电子版ISSN：1727-5652
出版年度：2008
卷号：54
期号：184
页码：117-124
DOI：10.3189/002214308784408991
出版社：Cambridge University Press
摘要：The seasonal deuterium excess signal of fresh snow samples from Neumayer station, coastal Dronning Maud Land, Antarctica, was studied to investigate the relationship between deuterium excess and precipitation origin. An isotope model was combined with a trajectory model to determine the relative influence of different moisture sources on the mean annual course of the deuterium excess, focusing on the phase lag between δ 18 O and excess d. Whereas the annual course of δ 18 O always shows an austral summer maximum, which clearly depends on local temperature and the annual course of moisture source-area parameters, the deuterium excess of the fresh snow samples shows maximum values already in spring. There can be many different reasons for the time lag between δ 18 O and deuterium excess in an ice core, including post-depositional processes and changes in the moisture source of precipitation. The use of fresh snow samples enabled us to exclude post-depositional processes and study solely the influence of precipitation origin. Changes in the moisture source connected to systematic changes in the general atmospheric circulation can have a strong influence on the phase lag between deuterium excess and δ 18 O, which has to be taken into account for climatic interpretation of stable-isotope profiles from ice cores.