| Srivastava Atul,Gera Anitha,Momin Imran M.,Mitra Ashis Kumar,Gupta Ankur. 2020. The impact of northern Indian Ocean rivers on the Bay of Bengal using NEMO global ocean model. Acta Oceanologica Sinica, 39(3):45－55 |
| The impact of northern Indian Ocean rivers on the Bay of Bengal using NEMO global ocean model |
| The impact of northern Indian Ocean rivers on the Bay of Bengal using NEMO global ocean model |
| Received:February 22, 2019 |
| DOI：10.1007/s13131-020-1537-9 |
| Key words:Bay of Bengal sea surface temperature salinity mixed layer depth stratification |
| 中文关键词: Bay of Bengal sea surface temperature salinity mixed layer depth stratification |
| 基金项目:MOES-NERC Bay of Bengal BLE project. |
| Author Name | Affiliation | E-mail | | Srivastava Atul | National Centre for Medium Range Weather Forecasting, Noida 201309, India
Jaypee University Anoopshahr, Bulandshahr 203309, India | atul.ecc@gmail.com | | Gera Anitha | National Centre for Medium Range Weather Forecasting, Noida 201309, India | | | Momin Imran M. | National Centre for Medium Range Weather Forecasting, Noida 201309, India | | | Mitra Ashis Kumar | National Centre for Medium Range Weather Forecasting, Noida 201309, India | | | Gupta Ankur | National Centre for Medium Range Weather Forecasting, Noida 201309, India | |
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| Abstract: |
| The effect of river runoff over the northern Indian Ocean (NIO) especially over the Bay of Bengal (BoB) 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 BoB 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 BoB and is the main cause for low salinity there. Sea surface temperature in the northwestern BoB 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 BoB 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 BoB. |
| 中文摘要: |
| The effect of river runoff over the northern Indian Ocean (NIO) especially over the Bay of Bengal (BoB) 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 BoB 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 BoB and is the main cause for low salinity there. Sea surface temperature in the northwestern BoB 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 BoB 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 BoB. |
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