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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Asia-Pacific Journal of Atmospheric Sciences Vol.45 No.2
발행연도
수록면
233 - 246 (14page)

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초록· 키워드

In this study, the modified RS?PM model (Mu et al., 2007) was revised to estimate land surface evapotranspiration (ET) by using MODIS products only. Our stand?alone algorithm was devised to utilize MODIS atmospheric and land products to estimate input variables for the PMmodel including net radiation, vapor pressure, and canopy conductance. Also, a simple gap filling approach was proposed for the MODIS aerosol data that was identified as a bottleneck to determine retrieval rates of global radiation and ET. Ground global radiation data from 22 National Weather Stations (NWS) from 2004 to 2006 were utilized to test and improve MODIS global radiation and the gap filling algorithm. Evapotranspiration observed at two KoFlux sites were analyzed to assess the accuracy ofMODIS ET. The retrieval rate of MODIS global radiation was doubled up to 42 and 44%for Terra and Aqua, respectively, after the aerosol gap filling with negligible compromise of the accuracy. In spite of the high accuracy of MODIS driven input variables (i.e. global radiation and net radiation),MODIS ET showed meaningful errors at the two KoFlux sites.MODIS ET for partial clear?sky condition showed almost similar errors to those for clear?sky condition,while retrieval rates were increased nearly twofold. Our study indicates thatmore endeavors are necessary on improving the accuracy and themodel needs to be tested across many geographic locations with different climate regimes, biome types, and landscape complexity.
#Evapotranspiration #global radiation #MODIS #KoFlux
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목차

  1. Abstract
  2. 1. Introduction
  3. 2. Materials and Methods
  4. 3. Results and Discussion
  5. 4. Discussion
  6. Appendix: Expression for Bird‘s Clear Sky model
  7. REFERENCES

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