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    Variability of the oceanic boundary layer characteristics in the Northern Bay of Bengal during MONTBLEX-90

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    Proc_Indian_Acad_Sci_(EPS)_105_41.pdf (1.523Mb)
    Date
    1996
    Author
    Murty, V.S.N.
    Sarma, Y.V.B.
    Rao, D.P.
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    Abstract
    Variability of the ocean surface boundary layer characteristics on daily time-scale is studied utilizing the 3-hourly hydrographic data collected at a stationary location (20 degrees N, 89 degrees E) in the Bay of Bengal during August (18th-31st) and September (9th-19th), 1990 under MONTBLEX-90 field programme. The daily variations of temperature, salinity, sigma sub(phi, mixed layer thickness, stability, heat content and rate of change of heat content in the upper 100 m are discussed in relation to prevailing weather (depressions) and hydrographic conditions (influx of fresh water, presence of eddies). With the development of a low into a deep depression close to the study area, intense upwelling of subsurface cold waters is noticed from 100 m to the bottom of the surface mixed layer (20 m) from 18th to 20th August. The upwelling is weakened by 21st August when the depression moved away from the study location. This variation of upwelling is supported by the variation of surface mixed layer thickness, static stability at 30 m depth, heat content in the upper 100 m and the heat content up to the depth of 20 degrees C isotherm from 18th to 21st August. The rate of change of heat content in the upper 100 m and up to the depths of 20 degrees C and 14 degrees C isotherms leads to net heat storage during August and to net heat depletion during September. This together with the net surface heat gain lead to an import (197 Wm sup(-2)) and export (233 Wm sup(-2)) of heat during August and September respectively through horizontal advective processes. These advective processes are attributed to the presence and movement of a warm core eddy through the study location
    URI
    http://drs.nio.org/drs/handle/2264/2261
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