Variability of Mixed-Layer Heights over the Indian Ocean and Central Arabian Sea during INDOEX, IFP-99 |
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| Authors: | D Bala Subrahamanyam Radhika Ramachandran K Sen Gupta Tuhin K Mandal |
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| Institution: | (1) Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695 022 Kerala, India;(2) National Physical Laboratory, Dr. K S Krishnan Marg, New Delhi, 110 012, India |
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| Abstract: | The upper air data collected from the balloon-borne GLASS Sondes launched from the Oceanic Research Vessel (ORV) Sagar Kanya during the Intensive Field Phase of the Indian Ocean experiment (INDOEX, IFP-99;SK-141 Cruise) are utilized forstudying the variability in the mixed-layer heights observed over the western tropical Indian Ocean and central Arabian Sea. During the entire cruise, typical daytime convective mixed-layer heights (roughly corresponding to 1400 LT) obtained from  V and q profiles, were observed to be in the range 200–900 m. Shallowmixed -layer heights are observed, in general, over the Inter-Tropical Convergence Zone (ITCZ). Over the central Arabian Sea, vertical profiles of V and q demonstrate a double mixed-layer structure of the marine atmospheric boundary layer (MABL), which gradually disappears close to the Indian coastline. |
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| Keywords: | Indian Ocean Experiment (INDOEX) Inter-Tropical Convergence Zone (ITCZ) Lifting condensation level (LCL) Marine atmospheric boundary layer (MABL) Mixed layer height Ocean-atmosphere interaction |
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