User's Guide on the Use of GOES-8, SSM/T and SSM/T-2 Radiance Measurements in MM5: The Radiative Transfer Models, and Their Tangent Linear and Adjoint operators
FLORIDA STATE UNIV TALLAHASSEE DEPT OFMETEOROLOGY
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This documentation describes, the development of the RTM and it tangent linear and adjoint models for the use of new Goestationary Operational Environmental Satellite GOES system, Defense Meteorology Satellite Program DMSP Special Sensor Microwave Temperature sounder SSMT, the Special Sensor Microwave Water Vapor Profiler SSMT-2. The RTM is the major forward observation operator which calculates the radiance based on the model state and the input of the satellite geometry. The tangent linear and adjoint of the forward observation operator is developed according to the method described by Navon et al. 1992 and is also described in this documentation. Satellites are a critical part of the global observing system, particularly over oceans where very few other observations exist. While temperature and humidity retrievals from satellite observations have played some roles in numerical weather prediction, more benefits may be obtained by the direct use of the rawer form of data, which could be handled with the introduction of adjoint techniques into meteorology Le Dimet and Talagrand, 1986. This document is organized as follows A brief description of GOES-8, SSMT and SSMT2 Satellites is provided in Section 2. The RTMs are presented in Section 3. Section 4 reports the development of the tangent linear and adjoint of RTMs and the correctness test results. The linkage of the RTM and the RTM adjoint operator is given in Section 5. The last section, Section 6, provides a description of the source codes.