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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/122/04/0935-0946

    • Keywords

       

      Atmospheric motion vectors; visible images.

    • Abstract

       

      Till now low-level winds were retrieved using Kalpana-1 infrared (IR) images only. In this paper, an attempt has been made to retrieve low-level cloud motion vectors using Kalpana-1 visible (VIS) images at every half an hour. The VIS channel provides better detection of low level clouds, which remain obscure in thermal IR images due to poor thermal contrast. The tracers are taken to be 15 × 15 pixel templates and hence each wind corresponds to about 120km × 120km at sub-satellite point. Multiplet based wind retrieval technique is followed for VIS wind derivation. However, for height assignment of VIS winds, collocated IR image is used. Due to better contrast between cloud and ocean surface, the low level atmospheric flow is captured better as compared to IR winds. The validation of the derived VIS winds is done with Global Forecast System (GFS) model winds and Oceansat-II scatterometer (OSCAT) winds.

    • Author Affiliations

       

      Inderpreet Kaur1 S K Deb1 C M Kishtawal1 P K Pal1 Raj Kumar1

      1. Atmospheric and Oceanic Sciences Group, Space Applications Centre, Indian Space Research Organization, Ahmedabad 380 058, India.
    • Dates

       
  • Journal of Earth System Science | News

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