edu.ucar.opensky::articles:3301 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T16:43:27.476627 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7v124mq Wind and thermodynamic retrieval from single-doppler measurements of a gust front observed during Phoenix-II 1994-06-01T00:00:00Z publication https://n2t.org/ark:/85065/d7v124mq https://doi.org/10.1175/1520-0493(1994)122<1075:WATRFS>2.0.CO;2 Sun, Juanzhen author Crook, Andrew author UCAR/NCAR - Library publisher The adjoint method to retrieve the three-dimensional wind and thermodynamic fields is applied to single-Doppler observations of a gust front measured during the Phoenix II experiment. This method uses a fluid dynamics model and its adjoint, and combines the retrieval with data assimilation into the prediction model. The wind and thermodynamic variables are determined by minimizing the difference between the model solution and the observations. Experiments are conducted first with radial velocity alone and then with both radial velocity and reflectivity to examine the quality of the retrieval with respect to radar location, boundary conditions, length of assimilation, data filtering, smoothing enforced by penalty functions, and model accuracy. Verification of these experiments is provided by a dual-Doppler analysis. Test results show that the adjoint method is able to retrieve the wind and thermodynamic fields of the gust front. The retrieved horizontal wind agrees very well with the dual-Doppler analysis. This study also demonstrates that the adjoint method has the ability to resolve finescale features along the loading edge of the gust front. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 1994 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 of the U.S. Copyright Act or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statement, requires written permission or a license form the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/AMS) or from the AMS at 617-227-2425 or copyright@ametsoc.org. None eng geoscientificInformation