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http://dx.doi.org/10.5467/JKESS.2014.35.1.19

A Comparison of Observed and Simulated Brightness Temperatures from Two Radiative Transfer Models of RTTOV and CRTM  

Kim, Ju-Hye (Korea Institute of Atmospheric Prediction Systems)
Kang, Jeon-Ho (Korea Institute of Atmospheric Prediction Systems)
Lee, Sihye (Korea Institute of Atmospheric Prediction Systems)
Publication Information
Journal of the Korean earth science society / v.35, no.1, 2014 , pp. 19-28 More about this Journal
Abstract
The radiative transfer for TIROS operational vertical sounder (RTTOV) and the community radiative transfer model (CRTM) are two fast radiative transfer models (RTM) that are used as observation operators in numerical weather prediction (NWP) systems. This study compares the basic structure and input data of the two models. With data from Advanced Microwave Sounding Unit-A (AMSU-A), which has channels of various frequencies, observed brightness temperature ($T_B$) and simulated $T_B$s from the two models are compared over the ocean surface in two cases-one where cloud information is included and the other without it. Regarding AMSU-A sounding channels (5-14), the two models produce no large significant differences in their calculated $T_B$, but RTTOV produces smaller first guess (FG) departures (i.e., better results) in window and near-surface sounding channels than does CRTM. When adding cloud water and ice particles from Unified Model (UM), the $T_B$ bias between observations and simulations are reduced in both models and the bias at 31.4 and 89 GHz is substantially decreased in CRTM compared to those of RTTOV.
Keywords
radiative transfer model; microwave; AMSU-A; RTTOV; CRTM;
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