Origins of wind‐driven intraseasonal sea level variations in the North Indian Ocean coastal waveguide
Origins of wind‐driven intraseasonal sea level variations in the North Indian Ocean coastal waveguide
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DOI：
10.1002/2013gl058312
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发表时间：
2013-11
影响因子：
5.2
通讯作者：
I. Suresh;J. Vialard;M. Lengaigne;W. Han;J. McCreary;F. Durand;P. M. Muraleedharan
中科院分区：
文献类型：
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作者：
I. Suresh;J. Vialard;M. Lengaigne;W. Han;J. McCreary;F. Durand;P. M. Muraleedharan
在本文中，我们表明，一个线性的，连续分层的海洋模式再现了观测到的风驱动的季节内海平面变化在沿海波导的北方印度洋（NIO）。在赤道地区、孟加拉湾和阿拉伯海有选择地应用季节内风强迫的敏感性实验表明，大部分流域尺度海平面变化是由沿着赤道的纬向风波动驱动的。在NIO沿海波导内，远赤道强迫的贡献从安达曼海的~80-90%减少到斯里兰卡东北部的~50%，然后沿印度西海岸增加到~60-70%沿着。在西南季风期间，季节内风的变化变得更强的NIO，导致当地风强迫沿着印度西部（高达60%）和东部（高达40%）海岸海平面变化的贡献更大。
In this paper, we show that a linear, continuously stratified ocean model reproduces observed wind‐driven intraseasonal sea level variability in the coastal waveguide of the Northern Indian Ocean (NIO). Sensitivity experiments with intraseasonal wind forcing selectively applied in the equatorial region, Bay of Bengal, and Arabian Sea show that a large part of the basin‐scale sea level variations are driven by zonal wind fluctuations along the equator. Within the NIO coastal waveguide, the contribution of remote equatorial forcing decreases from ~80–90% in the Andaman Sea to ~50% northeast of Sri Lanka and then increases to ~60–70% along the west coast of India. During the southwest monsoon, intraseasonal wind variations become stronger over the NIO, resulting in a larger contribution of local wind forcing to sea level variability along the west (up to 60%) and east (up to 40%) coasts of India.