Intraseasonal variability of sea surface height in the Bay of Bengal
Intraseasonal variability of sea surface height in the Bay of Bengal
复制标题
孟加拉湾海面高度的季节内变化
DOI：
10.1002/jgrc.20075
复制
发表时间：
2013-02-01
影响因子：
3.6
通讯作者：
Du, Yan
中科院分区：
文献类型：
--
作者：
Cheng, Xuhua;Xie, Shang-Ping;Du, Yan
利用测高资料和一个涡旋分辨海洋模式研究了孟加拉湾海面高度的季节内变化。在模式后报和卫星观测中，在BoB的东部和北方海岸、西部和以北纬5度附近为中心的横跨海湾的带状带中，沿着发现了大型SSH ISV。ISV显示出明显的季节性。在孟加拉国西部，它在春季达到全年最高值，而在斯里兰卡东南部的夏季和秋季。在赤道季节内风的驱动下，赤道开尔文波向东传播，到达苏门答腊岛西海岸，并在那里反射，以沿岸捕获波的形式围绕BoB的周边传播。两个不同的带的高涡动活动的检测在西部和中部的BoB，分别。在这两个频带中，孤立的涡旋向西南传播。中央海湾的涡流序列中的涡流形成与缅甸附近伊洛瓦底江三角洲拐角处的海岸波浪有关。涡动活动在一定程度上对中部湾高ISV有贡献。能量学分析表明，在西印度洋的高总涡动能量是由于正压/斜压不稳定的平均电流。引文：Cheng，X.，S.- P. Xie，J. P. McCreary，Y. Qi和Y. Du（2013），孟加拉湾海面高度的季节内变化，J. Geophys。Res. Oceans，118，816-830，doi：10.1002/jgrc.20075.
Intraseasonal variability (ISV) of sea surface height (SSH) over the Bay of Bengal (BoB) is studied using altimetry data and an eddy-resolving ocean model. In both the model hindcast and satellite observations, large SSH ISV is found along the eastern and northern coasts of the BoB, in the western BoB, and in a zonal band across the Bay centered near 5 degrees N. The ISV displays a clear seasonality. In the western BoB, it reaches its annual maximum in spring, whereas it does so in summer and autumn southeast of Sri Lanka. Driven by equatorial intraseasonal winds, equatorial Kelvin waves propagate eastward, reach the western coast of Sumatra, and reflect there to propagate around the perimeter of the BoB as coastally trapped waves. Two distinct bands of high eddy activity are detected in the western and central BoB, respectively. In both bands, isolated eddies propagate southwestward. Eddy formation in the eddy train in the central Bay is linked to the coastal wave as it bends around the corner of the Irrawaddy Delta off Myanmar. Eddy activity contributes to the high ISV in the central Bay to some extent. An energetics analysis indicates that high total eddy energy in the western BoB is due to barotropic/baroclinic instability of the mean current. Citation: Cheng, X., S.-P. Xie, J. P. McCreary, Y. Qi, and Y. Du (2013), Intraseasonal variability of sea surface height in the Bay of Bengal, J. Geophys. Res. Oceans, 118, 816-830, doi:10.1002/jgrc.20075.