Glacial-interglacial changes in ocean surface conditions in the southern hemisphere

被引:168
作者
Vimeux, F
Masson, V
Jouzel, J
Stievenard, M
Petit, JR
机构
[1] CEA, CNRS, UMR 1572, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France
[2] Lab Glaciol & Geophys Environm, CNRS, F-38402 St Martin Dheres, France
关键词
D O I
10.1038/18860
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The stable-isotope signatures of oxygen and hydrogen in the water of preserved ice and snow are both widely used to infer local temperatures of past environments. A derived quantity based on these two signatures, the 'deuterium excess'(1), provides additional palaeoclimatic information(2-4), as this parameter depends on the meteorological and oceanic characteristics of the water's source-regions (in particular, their temperature(2,3) and relative humidity(4)). Published studies mainly focus on records from the past 40,000 years. Here we present a deuterium-excess history obtained from ice cores from Vostok, East Antarctica, spanning the full glacial-interglacial cycle of the past 150,000 years. The deuterium-excess record shows a strong anticorrelation with the Earth's orbital obliquity (similar to 41,000-year periodicity), and values are markedly higher during the cold stage 5d (following the last interglacial) than during the other cold stages. We interpret the relationship with obliquity as resulting from changes in the latitudinal insolation gradient affecting ocean surface conditions and, thus, the delivery of moisture to the polar region. We argue that the high 5d values, relative to other cold stages, are driven by relatively less moisture delivered from high latitudes, and more from low latitudes. The deuterium-excess in Antarctic precipitation thus provides long-term, spatially integrated information on ocean surface conditions and ocean/atmosphere circulations in the Southern Hemisphere.
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页码:410 / 413
页数:4
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