A two-step variational method for three-dimensional wind retrieval from single Doppler radar |
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Authors: | C-J Qiu A-M Shao S Liu Q Xu |
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Institution: | (1) Department of Atmospheric Science, Lanzhou University, P. R. China;(2) CIMMS, University of Oklahoma/NOAA, Norman, OK, USA;(3) National Severe Storm Laboratory, Norman, OK, USA |
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Abstract: | Summary A two-step variational method is developed to retrieve the three-dimension wind field from single-Doppler radar observation
for operational applications. The first step produces a proxy background wind field, and the second step retrieves the detailed
wind structures in data dense areas on a high-resolution grid. The background field is called proxy because it is obtained
in the first step by a spectral analysis of the same radial-wind observations that will be used in the second step and thus
the background is not independent of the observations. In the second step, the wind retrieval is constrained by the proxy
background and the advection equation of liquid water content in the cost function. Tested with a dataset collected during
Meiyu front heavy rainfall on 22 July 2002 in China, the two-step approach is shown to yield the best performance in comparison
with a single-step approach that uses either only the proxy background field or the retrieval without the proxy background. |
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