Heat and Buoyancy Budgets and Mixing Rates in the Upper Thermocline of the Indian and Global Oceans
Heat and Buoyancy Budgets and Mixing Rates in the Upper Thermocline of the Indian and Global Oceans
复制标题
印度洋和全球温跃层上部的热量和浮力收支以及混合率
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
L. Talley
中科院分区：
文献类型：
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作者：
Huai;L. Talley
摘要在上层温跃层中，由等密度线和等温线、海-气界面和海岸线（如适用）界定的水体积的浮力和热量预算估算出透圈和透热扩散率值。对印度洋进行了全面的分析，并对全球进行了广泛的一般性描述。印度洋在北部（特别是东北部）获得浮力，在亚热带南部失去浮力。最新鲜和密度最小的水出现在孟加拉湾，等密度线从那里向西南出露，然后向南。横扩散系数（Kρ）的计算从孟加拉湾开始，向西南和南方扩展，并随着深度的增加而增加。随着等密度线从东北方向向赤道方向延伸，随着深度的增加，Kρ在20.2 σθ（孟加拉湾）到22.0 σθ（印度洋东北部）保持在1.3 cm 2 s−1左右。再往南（向极）和更深处，Kρ从23.0 σθ（20°S以北）的0.9 cm 2 s−1减小到25.0 σθ（20°S以北）的0.5 cm 2 s−1。
Abstract Diapycnal and diathermal diffusivity values in the upper thermocline are estimated from buoyancy and heat budgets for water volumes bounded by isopycnals and isotherms, the air–sea interface, and coastline where applicable. Comprehensive analysis is given to the Indian Ocean, with an extended global general description. The Indian Ocean gains buoyancy in the north (especially in the northeast) and loses buoyancy in the subtropical south. Freshest and least-dense water appears in the Bay of Bengal and isopycnals outcrop southwestward from there and then southward. Computation of diapycnal diffusivity (Kρ) starts from the Bay of Bengal, expanding southwestward and southward and with depth. As isopycnals extend equatorward from the northeast and with increasing depth, Kρ remains at about 1.3 cm2 s−1 for 20.2 σθ (Bay of Bengal) to 22.0 σθ (northeast Indian Ocean). Farther south (poleward) and at greater depth, Kρ decreases from 0.9 cm2 s−1 for 23.0 σθ (north of 20°S) to 0.5 cm2 s−1 for 25.0 σθ (north...