Comparisons of Collection 5 and 6 Aqua MODIS07_L2 air and Dew Temperature Products with Ground-Based Observation Dataset

Abstract

: Moderate Resolution Imaging Spectroradiometer (MODIS) provides air temperature (Tair) and dew point temperature (Tdew) profiles at a spatial resolution of 5 km. New Collection 6 (C006) MODIS07_L2 atmospheric profile product has been produced since 2012. The Collection 6 algorithm has several modifications from the previous Collection 5 (C005) algorithm. This study evaluated reliabilities of two alternative datasets of surface-level Tair and Tdew derived from C005 and C006 Aqua MODIS07_L2 (MYD07_L2) products using ground measured temperatures from 77 National Weather Stations (NWS). Saturated and actual vapor pressures were calculated using MYD07_L2 Tair and Tdew. The C006 Tair showed lower mean error (ME, -0.76 K) and root mean square error (RMSE, 3.34 K) than the C005 Tair (ME = -1.89 K, RMSE = 4.06 K). In contrasts, ME and RMSE of C006 Tdew were higher than those (ME = -0.39 K, RMSE = 5.65 K) of C005 product. Application of ambient lapse rate for Tair showed appreciable improvements of estimation accuracy for both of C005 and C006, though this modification slightly increased errors in C006 Tdew. The C006 products provided better estimation of vapor pressure datasets than the C005-derived vapor pressure. Our results indicate that, except for Tdew, C006 MYD07_L2 product showed better reliability for the region of South Korea than the C005 products.

Evaluation of the Satellite-based Air Temperature for All Sky Conditions Using the Automated Mountain Meteorology Station (AMOS) Records: Gangwon Province Case Study

“…그러 나 세계적으로 인공위성정보 기반의 기상자료 획득률 제고 연구는 큰 관심사이기는 하지만 (Tang and Li, 2008;Bisht and Bras, 2010;Jang et al, 2014a) (Masuoka et al, 1998) (Jones et al, 2010;Jang et al, 2014a). 본 연구에서 사용된 인공위성 센서의 특성과 자료 설명은 안한다면 (Bisht et al, 2005;Ryu et al, 2008;Jang et al, 2009;Borbas et al, 2011;Jang et al, 2014a (Jang et al, 2014b). 이러한 결과를 바탕으 로 MYD07_L2 기온정보는 평지지역과 산악지역 모두 대기기온감률 방법을 적용함으로써 정확도를 다소 개선 시킬 수 있음을 보였다.…”