edu.ucar.opensky::articles:6132 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T16:09:17.532376 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7319w2g Assimilating radar, surface and profiler data for the Sydney 2000 forecast demonstration project 2002-06-01T00:00:00Z publication https://n2t.org/ark:/85065/d7319w2g https://doi.org/10.1175/1520-0426(2002)019<0888:ARSAPD>2.0.CO;2 Crook, Andrew author Sun, Juanzhen author UCAR/NCAR - Library publisher A variational scheme for the analysis of low-level wind data is presented, and its performance during a recent field experiment is described. The analysis scheme finds an optimal fit to the data and a background field under the constraints of a dry boundary layer model. The scheme was run at the Sydney 2000 Forecast Demonstration Project and assimilated data from two Doppler radars, a surface mesonet, and a boundary layer profiler. With a few exceptions, the analysis system ran reliably over the 6-month period of the project, providing wind fields every 10 min. Described herein is the performance of the system in tracking a number of different phenomena, including sea breezes, a southerly change, and the low-level convergence associated with a severe tornadic hailstorm. Finally, the analyzed wind fields are verified using independent aircraft data and compared with winds calculated by the more traditional dual-Doppler approach. 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 2002 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