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Internal waves over the shelf in the western Bay of Bengal: A case study

DRS at CSIR-National Institute of Oceanography

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Title Internal waves over the shelf in the western Bay of Bengal: A case study
 
Creator Joshi, M.
Rao, A.D.
Mohanty, S.
Pradhan, H.K.
Murty, V.S.N.
RamPrasad, K.V.S.
 
Subject Oceanography and limnology
Meteorology and climatology
Oceanography and limnology
Oceanography and limnology
 
Description Generation and propagation of internal waves (IWs) in the coastal waters of the extended shelf of the western Bay of Bengal are investigated for late winter by using the Massachusetts Institute of Technology General Circulation Model (MITgcm). The model is forced with astronomical tides and daily winds. Monthly climatological temperature and salinity fields are used as initial conditions. The simulations are compared with time series observations of temperature and currents from acoustic Doppler current profiler (ADCP) and conductivity-temperature-depth (CTD) moored at three locations south of Gopalpur: two at a local depth of 100 m and another at 400-m depth during 19–21 February 2012. The comparison of the spectral estimates for the time series of temperature from the model and observations are in reasonable agreement for the near-tidal frequency waves. The peak of temperature spectra is always found near the shelf break region which steadily lost its intensity over the continental shelf. The calculation of Richardson number reflected the presence of local mixing due to density overturning in the shelf region. To understand further the generation and propagation of internal tides in the region, energy flux and conversion of barotropic-to-baroclinic M2 tidal energy are examined. The model simulations suggest that the internal tide is generated all along the shelf slope. The energy flux analysis shows that the internal tides propagate to either side of the generation sites.
 
Date 2017-03-01T09:08:43Z
2017-03-01T09:08:43Z
2017
 
Type Journal Article
 
Identifier Ocean Dynamics, vol.67(1); 2017; 147-161
http://drs.nio.org/drs/handle/2264/5083
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2016] Springer.
 
Publisher Springer