The impact of northern Indian Ocean rivers on the Bay of Bengal using NEMO global ocean model

作     者：Atul Srivastava Anitha Gera Imran MMomin Ashis Kumar Mitra Ankur Gupta Atul Srivastava;Anitha Gera;Imran M. Momin;Ashis Kumar Mitra;Ankur Gupta

作者机构：National Centre for Medium Range Weather ForecastingNoida 201309India Jaypee University AnoopshahrBulandshahr 203309India 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2020年第39卷第3期

页      面：45-55页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0908[农学-水产] 0707[理学-海洋科学] 

基　　金：MOES-NERC Bay of Bengal BLE project. 

主　　题：Bay of Bengal sea surface temperature salinity mixed layer depth stratification 

摘      要：The effect of river runoff over the northern Indian Ocean(NIO) especially over the Bay of Bengal(Bo B) has been studied using global Nucleus for European Modelling of the Ocean(NEMO). Two sensitivity experiments, with and without river runoff are conducted and the influence of river runoff on the Indian Ocean hydrography,stratification and circulation features are studied. It is found that due to river runoff surface salinity over the northern Bo B decreases by more than 5 and the East India Coastal Current strengthens by 2 cm/s during post monsoon season. The fresh river water reaches up to 15°N in the Bo B and is the main cause for low salinity there.Sea surface temperature in the northwestern Bo B increases by more than 0.2℃ due to the river runoff in summer monsoon while surface cooling upto 0.2℃ is seen in north-west part of Bo B in winter season. The seasonal mixed layer depth in the region is found to be dependent on river runoff. The effect of vertical shear and Brunt Vaisala frequency on stratification is also examined. The ocean water becomes highly stratified up to 3 035 m due to the river runoff. It is found that the energy required for mixing is high in the northern and coastal Bo B.