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A Sensitivity Analysis of Accuracy for COMS Outgoing Longwave Radiation Product

  • Kim, Hyunji (Department of Spatial Information Engineering, Pukyong National University) ;
  • Han, Kyung-Soo (Department of Spatial Information Engineering, Pukyong National University) ;
  • Lee, Chang Suk (Department of Spatial Information Engineering, Pukyong National University) ;
  • Shin, Inchul (National Meteorological Satellite Center)
  • Received : 2015.02.16
  • Accepted : 2015.02.26
  • Published : 2015.02.28

Abstract

Outgoing Longwave Radiation (OLR) is emitted energy from the Earth that is an important indicator of cooling effect in global scale and meteorological events in regional scale. Satellite-driven OLR products have its advantages overcoming spatially limited representation. The Korean geostationary satellite, Communication, Ocean and Meteorological Satellite (COMS), has been producing OLR product in accordance with its own algorithm since Apr. 2011. This study introduces Spatio-Temporally Equalized Match-up (STEM) approach to evaluate the COMS OLR products. We have tested a number of cases of thresholds set by standard deviations of a subpixel $10.8{\mu}m$ to find optimal representation of OLR in the selective match-up. Each case was then validated with broadband reference data, Clouds and the Earth's Radiant Energy System (CERES). We found that selective STEM approach was useful to validate OLR product especially its distribution in homogeneous grids.

Keywords

Acknowledgement

Supported by : Korean Meteorological Administration

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