Abstract The implicit/explicit impact of global warming or the anthropogenic climate change on the coastal upwelling processes affects the marine ecosystem significantly and continuous monitoring of the coastal upwelling along the coastal regions is essential. The Ekman transport due to alongshore winds and Ekman pumping due to wind stress curl play important roles on the coastal upwelling, especially along the southern part of Indian peninsula. Upwelling Indexes based on wind and SST are computed in the study to demarcate the upwelling features along the coasts. Since upwelling leaves its trail on surface features, long time series of satellite-derived wind, Sea Surface Temperature (SST), Sea level anomaly (SLA) and Surface Chlorophyll-a concentration (Chl-a) are analyzed to understand the upwelling along the coastal regions of south India. The present study reveals a decrease in the intensity of upwelling along the western coast (Chl-a ∼ 0.2 mg/m3 dec−1, Upwelling Index based on wind () and Vertical Velocity of Ekman Pumping (VVEP) is approximately 0.0012 m2/s dec−1 and 0.120 cm/day dec−1 respectively) and a slight increase all along the eastern coast of southern India during summer monsoon (Chl-a along 11.3°N and 13.9°N is 1 mg/m3 dec−1, and VVEP along 10.5°N is 0.0023 m2/s dec−1 and 0.2 cm/day dec−1 respectively).

中文翻译：

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印度西南和东海岸季风上升流的时空变化

摘要 全球变暖或人为气候变化对沿海上升流过程的隐性/显性影响显着影响海洋生态系统，对沿海地区的沿海上升流进行持续监测至关重要。沿岸风引起的埃克曼输运和风应力卷曲引起的埃克曼抽水对沿海上升流起着重要作用，尤其是在印度半岛南部。研究中计算了基于风和 SST 的上升流指数，以划分沿海上升流特征。由于上升流在地表特征上留下痕迹，因此分析了卫星衍生的风、海面温度 (SST)、海平面异常 (SLA) 和地表叶绿素-a 浓度 (Chl-a) 的长时间序列，以了解沿印度南部沿海地区。