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Description:Although the tasks have evolved as a result of the accomplishments of the previous years and the evolving needs of the JCSDA partners, the Projects under which they are organized remain familiar, for example, the Community Radiative Transfer Model (CRTM), which has been central to the JCSDA since its inception. In this issue, Dr. Emily Liu of NCEP’s Environmental Modeling Center (EMC) and her co-authors have contributed an article describing some of EMC’s contributions to the development and validation of the CRTM for a variety of IR and MW sensors. The article underscores the cooperation of EMC and NESDIS/STAR working with JCSDA Core staff to develop and test improved elements of the CRTM, and the establishment of validation procedures that can be re-used as progressively more challenging RT targets - precipitating MW, all-sky IR radiances, etc., are tackled. Dr. Ricardo Todling of NASA’s Global Modeling and Assimilation Office (GMAO) and his co-author, Fabio Diniz, have provided an instructive article on the use of Forecast Sensitivity Observation Impact (FSOI) to support a 40-year reanalysis project providing a means of assessing the contributions of all constituents of the observing system efficiently, within the limits they describe, and setting the stage for a performing a subsequent reanalysis using more adaptable error statistics than in the present case. JCSDA’s Dr. Patrick Stegmann and his co-authors have contributed an article to this edition on the coding of C++ GNSS RO Forward Operators, facilitating their use via JEDI.
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