A study of cross-shore maximum upwelling intensity along the Northwest Africa coast
A study of cross-shore maximum upwelling intensity along the Northwest Africa coast
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西北非海岸跨岸最大上升流强度研究
DOI：
10.1007/s10872-013-0185-5
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发表时间：
2013-06
影响因子：
2.3
通讯作者：
Jo, Young-Heon
中科院分区：
文献类型：
--
作者：
Chen, Zhaoyun;Yan, Xiao-Hai;Jiang, Yuwu;Jiang, Lide;Jo, Young-Heon
海面温度（SST）卫星图像显示，跨岸海温最小值（LCSM）的位置沿着西北非洲上升流系统的等深线延伸。为了更好地理解和解释这些观测结果，我们建立了一个二维分析模型，该模型考虑了表面和底部埃克曼输运和沿岸地转流，以及底部摩擦和底部地形的变化。具有真实地形的垂直速度结构清楚地说明了样本跨岸剖面中海温下降的变化。通过理想化理论模型实验，考察了涡粘性、科里奥利力和对岸风对对岸最大上升流强度位置的影响。结果表明，跨岸风通过调整跨岸压力梯度，对最冷海水露头的位置产生较大影响。遥感数据也验证了这一点，遥感数据表明，跨岸风应力与LCSM深度之间的最大相关系数为-0.65，滞后约1 d。
Satellite images of sea surface temperature (SST) show that the location of cross-shore SST minimum (LCSM) stretches along the isobaths in the Northwest Africa Upwelling System. To understand and interpret these observations better, we set up a two-dimensional analytical model that takes into account the surface and bottom Ekman transport and the alongshore geostrophic current, as well as bottom friction and variations in bottom topography. The structure of vertical velocity with a realistic topography clearly illustrates the variations of SST drop in a sample cross-shore section. Some idealized theoretical model experiments are carried out to examine the effects of eddy viscosity, Coriolis force, and cross-shore wind on the location of the cross-shore maximum upwelling intensity. The results show that the cross-shore wind largely impacts on the location where the coldest water outcrops to the surface through an adjustment of the cross-shore pressure gradient. This is also verified by the remotely sensed data, which indicate that the maximum correlation coefficient between cross-shore wind stress and the depth of LCSM is −0.65 with a lag of approximately 1 day.
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影响因子：
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作者：
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通讯作者：
L. Jiang;L. Breaker;Xiaohong Yan
影响因子：
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作者：
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DOI：
10.1016/s0967-0645(00)00117-x
发表时间：
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影响因子：
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