Impact of river runoff on seasonal sea level, Kelvin waves, and East India Coastal Current in the Bay of Bengal : A numerical study using ROMS
Impact of river runoff on seasonal sea level, Kelvin waves, and East India Coastal Current in the Bay of Bengal : A numerical study using ROMS
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DOI：
10.1016/j.rsma.2020.101214
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发表时间：
2020-03-01
影响因子：
2.1
通讯作者：
Raju, Nadimpalli Jithendra
中科院分区：
文献类型：
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作者：
Dey, Subhra Prakash;Dash, Mihir K.;Raju, Nadimpalli Jithendra
高河流淡水流量使孟加拉湾（BoB）的盐度分布高度不均匀。本文利用区域海洋模拟系统（ROMS）研究了10条主要河流的淡水流量对BoB季节海面变化和沿海开尔文波特征的影响。在相同的强迫条件下，进行了两个数值实验：(i)有和（ii）没有将河流径流的月气候学纳入模型。该模式是由综合海洋-大气数据集（COADS）气候学强迫进行的。该研究表明，将河流流量纳入模型可以模拟海面盐度、季节性海平面变化、开尔文波活动和东印度沿海流（EICC）的真实情况。第二下泄开尔文波的振幅增加最多（在奥里萨邦海岸大于4 cm，在金奈海岸约为2 cm）。除此之外，我们还发现，当考虑河流径流时，赤道方向的EICC更强，更有组织。在大部分地区，当模型中加入河流径流时，EICC向赤道方向的体积输送量几乎增加了一倍。(C) 2020 Elsevier B.V.版权所有
High riverine freshwater discharge makes the salinity distribution highly heterogeneous in the Bay of Bengal (BoB). This paper investigates the impact of freshwater discharge from ten major rivers on the seasonal sea surface variability and the coastal Kelvin wave characteristics in the BoB using the Regional Ocean Modeling System (ROMS). Two numerical experiments were conducted (i) with- and (ii) without-incorporating monthly climatology of river runoff into the model under the same forcing conditions. The model was forced by Comprehensive Ocean-Atmosphere DataSet (COADS) climatology for both the experiments. This study demonstrates that incorporation of river discharge into the model simulates a realistic picture of sea surface salinity, seasonal sea level variations, Kelvin wave activities, and equatorward flowing East India Coastal Current (EICC). The amplitude of the second downwelling Kelvin wave is increased most (greater than 4 cm at the Odisha coast and approximately 2 cm near the Chennai coast) due to river discharge. Apart from that, we also found that the equatorward EICC is strengthened and more organized when river runoff is considered. The volume transport by equatorward EICC becomes almost double when river runoff is included in the model in most of the region. (C) 2020 Elsevier B.V. All rights reserved.