The varying tasks required for assimilating satellite radiance observations from the Atmospheric Infrared Sounder (AIRS) into the initial conditions of a numerical weather prediction model are discussed. The tangent linear and adjoint observation operators were developed from a fast and computationally inexpensive radiative transfer model (RTM). The adjoint model was used to conduct a sensitivity analysis of the RTM-produced radiances at each of the 2378 AIRS spectral channels. The results of this study confirm that the RTM is simulating the radiative transfer process well when using forecast model data as input. This analysis will be used to conduct an efficient channel selection study prior to assimilating AIRS radiances. The errors associated with both the AIRS observations and the RTM calculations are discussed. The error in the AIRS observations for the selected test case compare favorably with expected values obtained by the AIRS science team from both pre-flight and early orbit testing. Errors associated with the RTM when using forecast model fields as input were investigated. The bias of the model was computed and the results of this study will be used to correct the bias in the model solution prior to assimilation. The variance of the model was also computed and will be used to identify outliers and to construct the estimated model error covariance matrix, which will be used in the cost function calculation. The models developed and the errors calculated for all fields will be used in future work to assimilate radiance values into numerical weather forecasts. / A Thesis submitted to the Department of Meteorology in partial fulfillment of the requirements for the degree of Master of Science. / Fall Semester, 2004. / October 20, 2004. / Data Assimilation, 4D-Var, QPF, AIRS / Includes bibliographical references. / Xiaolei Zou, Professor Directing Thesis; Paul Ruscher, Committee Member; Kwang-Yul Kim, Committee Member.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_182341 |
| Contributors | Carrier, Matthew J. (authoraut), Zou, Xiaolei (professor directing thesis), Ruscher, Paul (committee member), Kim, Kwang-Yul (committee member), Department of Earth, Ocean and Atmospheric Sciences (degree granting department), Florida State University (degree granting institution) |
| Publisher | Florida State University, Florida State University |
| Source Sets | Florida State University |
| Language | English, English |
| Detected Language | English |
| Type | Text, text |
| Format | 1 online resource, computer, application/pdf |
| Rights | This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). The copyright in theses and dissertations completed at Florida State University is held by the students who author them. |
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