Wednesday, 26 January 2011
Washington State Convention Center
Handout (6.3 MB)
Sensors on future National Operational Environmental Satellite Systems-Joint Polar Satellite System (JPSS) and the Geostationary Operational Environmental Satellite R-Series (GOES-R) will provide satellite data to improve weather forecast in numerical weather prediction (NWP) models through direct assimilation of satellite radiances. In an operational NWP environment, the amounts of assimilated observed radiance are in order of ten of thousands or more per day. The Community Radiative Transfer Model (CRTM), a fast and accurate radiative transfer (RT) model which is developed at the Joint Center for Satellite Data Assimilation (JCSDA) providing calculated radiances (or brightness temperature (BT)) and the responses of the radiances to the perturbations of state variables (radiance Jacobians, Tangent-linear (TL), and Adjoint (AD) models), is a key component required in data assimilation and many other satellite radiance data applications. The current CRTM version (v2.0.2) has capability to simulate visible, infrared, and microwave channel radiances (or BTs) for satellite sensors under various atmosphere and surface conditions. CRTM readiness for NPP/JPSS and GOES-R is very important for Numerical Weather Prediction (NWP) centers to use GOES-R and JPSS data as soon as the new systems launch. Efforts have been made to produce the CRTM transmittance coefficients, which are used to calculate the clear sky atmospheric optical depth in CRTM, for the Cross-track Infrared Sounder (CrIS), the Advanced Technology Microwave Sounder (ATMS), and Visible/Infrared Imager/Radiometer Suite (VIIRS) on NPP, and the Advanced Baseline Imager (ABI) on GOES-R. The detail processes will be discussed for each of these sensors. The simulated brightness temperatures will also be presented.
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