Quality Control and Assessment of VAD Wind Profile of Doppler Weather Radar
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Abstract:
The Velocity Azimuth Display (VAD) winds provide wind field information with high temporal resolution. A quality control scheme, called the NMIC scheme, is developed for VAD winds from CINRAD Doppler radar, which improves the NCEP CQCVAD scheme. Compared with L-band sounding winds, the VAD data after the NMIC scheme is more accurate than those after the NCEP CQCVAD scheme and the data before quality control. The bias and root mean square error of the VAD data after the NMIC scheme are smaller than those after the NCEP CQCVAD scheme and the data before quality control at most height levels, which confirms the validity of the NMIC scheme. The VAD winds after quality control are also compared with the background. The distribution of the deviation between background and the VAD data after the NMIC scheme fits the Gaussian distribution better than the NCEP CQCVAD scheme. The results reveal that the VAD data after the NMIC scheme can meet the quality control requirements for data assimilation. This study would support and further improve the application of VAD winds in the numerical weather forecast.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.