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Intensification of Aila (May 2009) due to a warm core eddy in the north Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Intensification of Aila (May 2009) due to a warm core eddy in the north Bay of Bengal
 
Creator Sadhuram, Y.
Maneesha, K.
Murty, T.V.R.
 
Subject storm surges
cyclones
current rings
mixed layer
 
Description A very severe cyclonic storm "Aila" hit West Bengal on 26 May 2009. The storm intensified when it encountered with a warm core (SST = 31 degrees C) anti-cyclonic eddy (ACE4) in the north Bay of Bengal. The storm intensity increased by 43 percent due to this eddy, which is comparable with that (34 percent) obtained from a best fit line (derived from several numerical experiments over north-west Pacific Ocean). The shallow mixed layer of the large-scale ocean and deep mixed layer inside the eddy appear to be crucial parameters besides translation speed of the storm (Uh), ambient relative humidity and thermal stratification below mixed layer, in the storm intensification. From the eddy size and Uh, the eddy feedback factor is found to be about 0.4 (i.e. 40 percent), which is close to the above. Since there exists an inverse relationship between Uh and UOHC (upper ocean heat content), slow (fast) moving storms require high (low) UOHC. The warm ACE4 with a high UOHC of 149 kj/cm sup(2) (300 percent higher than the climatological value) and deep warm layer (D26 = 126 m) opposes the cooling induced by the storm and helps for the intensification of the storm through the supply of large enthalpy (latent + sensible) flux.
 
Date 2012-08-21T06:01:50Z
2012-08-21T06:01:50Z
2012
 
Type Journal Article
 
Identifier Natural Hazards, vol.63; 2012; 1515-1525
http://drs.nio.org/drs/handle/2264/4112
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2012] Springer.
 
Publisher Springer