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Impact of freshwater influx on the cyclogenesis, tracks of cyclones and air-sea coupling over the Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Impact of freshwater influx on the cyclogenesis, tracks of cyclones and air-sea coupling over the Bay of Bengal
 
Creator Murty, V.S.N.
Sarma, M.S.S.
Jenson, G.V.
Vidya, P.J.
 
Subject Bay of Bengal
seasonal variability
weather disturbances
freshwater influx
 
Description Over the Bay of Bengal weather disturbances of considerable seasonal variability in their zones of genesis, intensity, frequency and path across the Bay generate during May-November. This variability in the zones of cyclogenesis and paths of weather disturbances are well correlated with the proposed new dynamic parameter – the Effective Oceanic Layer for Cyclogenesis (EOLC) – defined as the geopotential thickness (Delta D) of the near-surface stratified layer formed due to spread of low salinity waters caused by freshwater influx and precipitation. It is found that the zone of higher EOLC, characterized by warmer temperature, lower surface salinity, higher heat potential and higher specific humidity in the surface air, couples with the zone of intense deep-organized convection (lower values of Outgoing Longwave Radiation) in the lower troposphere leading to the cyclogenesis. The surface flow in the stratified layer, decoupled from the thermocline process, appears to guide the movement of weather disturbance into the region of increasing effective heat potential. Thus, the EOLC is a useful parameter, over the sea surface temperature, for better prediction of cyclone tracks, among many other potential applications. The recently acquired upper ocean data from the Bay of Bengal Monsoon Experiment (BOBMEX) in 1999 and in November 2007 are found to be consistent with the above. Some results from these data sets will be presented.
 
Date 2008-05-23T06:25:55Z
2008-05-23T06:25:55Z
2008
 
Type Conference Article
 
Identifier Proceedings volume of Workshop on Natural Hazards and Coastal Processes of Indian Coast (NHACPIC-2008), 30th April 2008, 54-63p.
http://drs.nio.org/drs/handle/2264/1081
 
Language en
 
Publisher National Institute of Oceanography, India