Satellite Based Downward Long Wave Radiation by Various Models in Northeast Asia

10.3319/TAO.2014.08.15.01(Hy)

Chanyang Sur；Hyunwoo Kim；Minha Choi

Downward long wave radiation ； Moderate resolution imaging spectroradiometer ； Air temperature ； Vapor pressure ； Brutsaert ； Abramowitz

Terrestrial, Atmospheric and Oceanic Sciences

25卷6期（2014 / 12 / 01）

893 - 902

英文

Satellite-based downward long wave radiation measurement under clear sky conditions in Northeast Asia was conducted using five well-known physical models (Brunt 1932, Idso and Jackson 1969, Brutsaert 1975, Satterlund 1979, Prata 1996) with a newly proposed global R_(Id) model (Abramowitz et al. 2012). Data from two flux towers in South Korea were used to validate downward long wave radiation. Moderate resolution imaging spectroradiometer (MODIS) atmospheric profile products were used to develop the R_(Id) models. The overall root mean square error (RMSE) of MODIS R_(Id) with respect to two ecosystem-type flux towers was determined to be≈20 W m^(-2). Based on the statistical analyses, MODIS R_(Id) estimates with Brutsaert (1975) and Abramowitz et al. (2012) models were the most applicable for evaluating R_(Id) for clear sky conditions in Northeast Asia. The Abramowitz R_(Id) maps with MODIS T_a and ea showed reasonable seasonal patterns, which were wellaligned with other biophysical variables reported by previous studies. The MODIS R_(Id) map developed in this study will be very useful for identifying spatial patterns that are not detectable from ground-based R_(Id) measurement sites.