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    • Estimation of surface latent heat fluxes from IRS-P4/MSMR satellite data

      Randhir Singh B Simon P C Joshi

      Volume 110 Issue 3 September 2001 pp 231-238

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/110/03/0231-0238

    • Keywords

       

      Multi-frequency Scanning Microwave Radiometer (MSMR); Latent heat flux (LHF); National Centre for Environmental Prediction (NCEP)

    • Abstract

       

      The brightness temperatures of the Microwave sensor MSMR (Multichannel Scanning Microwave Radiometer) launched in May 1999 onboard Indian Oceansat-1 IRS-P4 are used to develop a direct retrieval method for latent heat flux by multivariate regression technique. The MSMR measures the microwave radiances at 8 channels at frequencies of 6.6, 10.7, 18 and 21 GHz at both vertical and horizontal polarizations. It is found that the surface LHF (Latent Heat Flux) is sensitive to all the channels. The coefficients were derived using the National Centre for Environmental Prediction (NCEP) reanalysis data of three months: July, September, November of 1999. The NCEP daily analyzed latent heat fluxes and brightness temperatures observed by MSMR were used to derive the coefficients. Validity of the derived coefficients was checked within situ observations over the Indian Ocean and with NCEP analyzed LHF for global points. The LHF derived directly from the MSMR brightness temperature (Tb) yielded an accuracy of 35 watt/m2. LHF was also computed by applying bulk formula using the geophysical parameters extracted from MSMR. In this case the errors were higher apparently due to the errors involved in derivation of the geophysical parameters.

    • Author Affiliations

       

      Randhir Singh1 B Simon1 P C Joshi1

      1. Atmospheric Sciences Division, Meteorology & Oceanography Group, Space Applications Centre, ISRO, Ahmedabad - 380 015, India

    • Dates

       
      Published
      September 2001
      Manuscript received
      30 April 2001
      Manuscript revised
      21 July 2001

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