A deep hydrological front between intermediate and deep-wafpr , masses in the glacial Indian Ocean
A deep hydrological front between intermediate and deep-wafpr , masses in the glacial Indian Ocean
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DOI：
10.1038/333651a0
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发表时间：
1988-06
期刊：
影响因子：
64.8
通讯作者：
N. Kallel;L. Labeyrie;A. Juillet‐Leclerc;J. Duplessy
中科院分区：
文献类型：
--
作者：
N. Kallel;L. Labeyrie;A. Juillet‐Leclerc;J. Duplessy
海洋环流和气候是紧密相连的。在与今天非常不同的气候条件下，深水和中水循环发生了剧烈变化1-7。例如，在上一次冰盛期(LGM)期间，深海海水比现在低几度8。这些深海温度的变化与大西洋和太平洋中、深水团化学性质的显著变化有关。本文重建了末次盛冰期(∼18000yr BP)印度洋中、深水团的水文结构。底栖有孔虫属(Foramirifia Genus Cibiides)的碳、氧同位素分析表明，盛冰期印度洋的水柱结构以分隔中、深水团的深锋为标志，具有截然不同的特征：中水团温度和~(13)C与今天相似。相比之下，吉普的水比低至少1.5摄氏度，在13摄氏度的温度下耗尽更多，氧气含量也很低。
Ocean circulation and climate are strongly interconnected. Under climatic conditions very different from those of today, deep and intermediate water circulation was subject to drastic changes1–7. For instance, during the last glacial maximum (LGM), deep ocean water was cooler than now by several degrees8. These temperature changes in the deep ticean were associated with striking variations in chemical characteristics of the intermediate and deep water masses of the Atlantic and Pacific Oceans3,8–13. Here we reconstruct the hydrological structure of the deep and intermediate water of the Indian Ocean during LGM (∼18,000yr BP). The carbon and oxygen isotope analyses of the benthic foramiriifira genusCibicidesshow that the water-column structure of the Indian Ocean during; LGM was marked by the presence of a deep front separating intermediate and deep-water masses with very different characteristics: Intermediate-water mass temperatures and §13C were similar to those of today. By contrast, the Jeep water was cooler than iiow by at least 1.5 °C, more depleted in13C and poorly oxygenated.