Marine boundary layer characteristics during a cyclonic storm over the Bay of Bengal

摘要

During the period 12-16 June 1996 a tropical cyclonic storm formed over the southwest Bay of Bengal and moved in a north-northeasterly direction. The thermodynamic characteristics of this system are investigated by utilizing the surface and upper air observations collected onboard ORV Sagar Kanya over the Bay of Bengal region. The response of the cyclonic storm is clearly evident from the ship observations when the ship was within the distance of 600-800 km from the cyclonic storm. This study explores why (ⅰ) the whole atmosphere from surface to 500 hPa had become warm and moist during the cyclonic storm period as compared to before and after the formation of this system and (ⅱ) the lower layer of the atmosphere had become stable during the formative stage of the cyclonic storm.