Observations of the Ekman Balance at 8°30′ N in the Arabian Sea during the 1995 Southwest Monsoon
Observations of the Ekman Balance at 8°30′ N in the Arabian Sea during the 1995 Southwest Monsoon
复制标题
1995 年西南季风期间阿拉伯海北纬 8°30′ 处埃克曼平衡的观测
DOI：
10.1029/97gl01057
复制
发表时间：
1997
影响因子：
5.2
通讯作者：
John M. Morrison
中科院分区：
文献类型：
--
作者：
T. Chereskin;W. D. Wilson;H. Bryden;A. Ffield;John M. Morrison
埃克曼输送是根据1995年6月和9月阿拉伯海西南季风期间进行的两组水文和船上声学多普勒流速剖面仪（ADCP）速度观测结果估计的。这两组测量都是沿沿着北纬8°30′，即世界海洋环流实验（WOCE）I1W线，从索马里到斯里兰卡进行的。根据非地转速度计算出的埃克曼输运估计值是向南的：6月为17.6 ± 2.4 106 m³ s−1，9月为7.9 ± 2.7 106 m³ s−1。这些直接估计值与Ekman平衡使用船上风和气候风预测的结果吻合良好。非地转速度的垂直结构和层化在样带的两种职业之间有很大的不同。6月，风力驱动的动量仅限于非常浅的一层（约50米），表层有强烈的分层，最大盐度层位于50至70米之间的深度。非地转速度在9月穿透得更深（约160米），密度跃层相应地更深。在这两种情况下，埃克曼运输穿透混合层之下，到密度跃层的顶部。
The Ekman transport is estimated from two sets of hydrographic and shipboard acoustic Doppler current profiler (ADCP) velocity observations made during June and September 1995, during the southwest monsoon in the Arabian Sea. Both sets of measurements were made along latitude 8°30′ N, designated as World Ocean Circulation Experiment (WOCE) line I1W, from Somalia to Sri Lanka. The Ekman transport estimates calculated from ageostrophic velocity were southward: 17.6 ± 2.4 106 m³ s−1 in June and 7.9 ± 2.7 106 m³ s−1 in September. These direct estimates were in good agreement with those predicted by the Ekman balance using both shipboard and climatological winds. The vertical structure of the ageostrophic velocity and the stratification were quite different between the two occupations of the transect. The wind‐driven momentum was confined to a very shallow layer in June (about 50 m) and the surface layer was strongly stratified, with a maximum salinity layer at depths between 50 and 70 m. The ageostrophic velocity penetrated much deeper in September (to about 160 m) and the pycnocline was correspondingly deeper. In both cases, the Ekman transport penetrated beneath the mixed layer, to the top of the pycnocline.
影响因子：
3.5
作者：
LARGE, WG;POND, S
通讯作者：
POND, S