• Savita B Morwal

      Articles written in Journal of Earth System Science

    • Thermodynamic structure of the marine atmosphere over the region 80–87°E along 13°N during August (phase II) BOBMEX-99

      Savita B Morwal P Seetaramayya

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      Thermodynamic structure of the marine atmosphere in the region between 80 and 87‡E along 13‡N over the Bay of Bengal was studied using 13 high resolution radiosonde profiles from surface-400 hPa collected onboard ORV Sagar Kanya during the period 27th–30th August, during BOBMEX-99. Saturation point concept, mixing line analysis and conserved variable diagrams have been used to identify boundary layer characteristics such as air mass movement and stability of the atmosphere. The results showed relatively dry air near the ocean surface between 1000 and 950 hPa. This feature is confirmed by the conserved þetav structure in this layer. Further, þetav seldom showed any inversions in this region. The þetae and þetaes profiles showed persistent low cloud layers between 900 and 700 hPa. The conserved variable diagrams (þetae-q) showed the existence of double mixing line structures approximately at 950 and 700 hPa levels.

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

      Savita B Morwal S G Nagar V S N Murty P Seetaramayya

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      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 onboardORV 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.

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