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

Atul Srivastava; Anitha Gera; Imran M. Momin; Ashis Kumar Mitra; Ankur Gupta

doi:10.1007/s13131-020-1537-9

Volume 39 Issue 3

Apr. 2020

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Atul Srivastava, Anitha Gera, Imran M. Momin, Ashis Kumar Mitra, Ankur Gupta. The impact of northern Indian Ocean rivers on the Bay of Bengal using NEMO global ocean model[J]. Acta Oceanologica Sinica, 2020, 39(3): 45-55. doi: 10.1007/s13131-020-1537-9

Citation:

Atul Srivastava, Anitha Gera, Imran M. Momin, Ashis Kumar Mitra, Ankur Gupta. The impact of northern Indian Ocean rivers on the Bay of Bengal using NEMO global ocean model[J]. Acta Oceanologica Sinica, 2020, 39(3): 45-55. doi: 10.1007/s13131-020-1537-9

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

doi: 10.1007/s13131-020-1537-9

1.
National Centre for Medium Range Weather Forecasting, Noida 201309, India
2.
Jaypee University Anoopshahr, Bulandshahr 203309, India

Funds: MOES-NERC Bay of Bengal BLE project.

More Information

Corresponding author: atul.ecc@gmail.com
Received Date: 2019-02-22
Accepted Date: 2019-05-05

Available Online: 2020-04-21

Publish Date: 2020-03-25

Abstract

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°C due to the river runoff in summer monsoon while surface cooling upto 0.2°C 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.
- Bay of Bengal,
- sea surface temperature,
- salinity,
- mixed layer depth,
- stratification

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References(49)

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