• Validation and assimilation of INSAT atmospheric motion vectors: Case studies for tropical cyclones

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      https://www.ias.ac.in/article/fulltext/jess/130/0235

    • Keywords

       

      Atmospheric motion vectors; INSAT-3D; Meteosat-8; validation; assimilation.

    • Abstract

       

      INSAT-3DR is the latest geostationary satellite launched by the Indian Space Research Organization (ISRO) as a continuation to the INSAT-3D, for enhanced meteorological observations. National Centre for Medium Range Weather Forecasting (NCMRWF) receives INSAT-3DR Atmospheric Motion Vectors (AMVs) through Global Telecommunication System (GTS) along with the AMVs from other satellites. The INSAT-3DR AMVs are validated against the in-situ observations for a period of 3 months, May–July 2020. The validation results are compared with the AMVs from other satellites like INSAT-3D and Meteosat-8 located over the same geographical area and found that the quality of INSAT-3DR AMVs is comparable. After the successful validation, INSAT-3DR AMVs are assimilated in the NCMRWF Global Forecast System (NGFS) for two cyclone cases, formed during May–June 2020 over the North Indian Ocean. Four Observation System Experiments (OSEs) are designed, with the assimilation of individual and combined AMVs from INSAT (3D and 3DR) and Meteosat-8, to see the impact of AMVs during the cyclones Amphan formed over the Bay of Bengal and Nisarga formed over the Arabian Sea. In general, assimilation of AMVs improved the simulation of both the cyclones Amphan and Nisarga formed during May–June 2020. Introduction of INSAT AMVs slowed down the otherwise fast-moving cyclone Amphan simulated due to the assimilation of Meteosat-8 AMVs. Both intensity and track of the cyclones Amphan and Nisarga are better simulated when the AMVs from INSAT and Meteosat-8 are assimilated together.

    • Author Affiliations

       

      PRITI SHARMA1 S INDIRA RANI M DAS GUPTA

      1. National Centre for Medium Range Weather Forecasting (NCMRWF), Ministry of Earth Sciences (MoES), A-50, Institutional Area, Sector-62, Noida, UP 201 309, India.
    • Dates

       
  • Journal of Earth System Science | News

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