Sub-surface temperature oscillations and associated flow in the western Bay of Bengal |
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Authors: | M K Antony C S Murty G V Reddy K H Rao |
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Institution: | National Institute of Oceanography Don Paula, Goa-403 004, India |
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Abstract: | Unusual temperature variations at subsurface depths were noticed while making continuous observations (for 13 h) on temperature, salinity and currents at a point in the vicinity of river Krishna in the western Bay of Bengal. Sharp temperature oscillations recorded at four different levels between 14 and 20·1 m had an average periodicity of about 1·6 h. Similar periodicities were also observed in the case of flow components. Computed Brunt-Vaisälä frequency, vertical shear and Richardson number showed remote possibilities of vertical mixing occurring in this area. These oscillations showed features of internal waves propagating with a speed of about 13·3 cm s−1 and wavelengths between 0·8 and 1·3 km and apparently generated as a result of flood current passing over a submarine obstacle in the presence of stratification. |
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Keywords: | temperature variations coastal currents internal waves shear Richardson number stratification continental shelf Bay of Bengal |
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