ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
1 Kashgar Regional Meteorological Observatory, Kashgar 8440002 Shanghai Center Meteorological Observatory, Shanghai 200030
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Abstract:
Based on the S-band dual-polarization radar data from Qingpu (Shanghai), Nantong (Jiangsu), Hangzhou, Jiaxing and Huzhou (Zhejiang), the effectiveness evaluation of three volume scan patterns (VCP21D, VCP11D, and VCP216D) are assessed under general precipitation, severe convective and typhoon conditions. The evaluation is based on three methods: subjective identification of characteristic tracer factors, interpolation of reflectivity factor isosurfaces, and wind field retrieve using dual-radar data. The results indicate that both VCP21D and VCP11D can accurately identify the zero-degree bright band characteristic. VCP21D, compared to VCP11D, shows better stability in recognizing the melting layer height, with a smaller standard deviation and a better match to actual conditions. The convective scan patterns (VCP11D and VCP216D) significantly enhance vertical observational resolution compared to the precipitation mode (VCP21D). This improvement is crucial for detecting key severe weather phenomena, such as columns and mesoscale cyclones. Meanwhile, the additional 1.0° elevation angle in VCP216D volume scan pattern is particularly effective in capturing mesoscale features such as low-level gust fronts and sea breeze fronts. Also, this additional scan cut eliminates the effect from ground clutter echoes for data quality improvement. The data from VCP11D and VCP216D volume scan pattern shows great advantages in generating constant altitude plan position indicator (CAPPI), characterize the details special above 5 km altitude, compared to VCP21D volume scan pattern. in both isosurface interpolation and wind field inversion. In the comparison of wind field retrieve, the availability and accuracy of the retrieved data significantly improved, from double VCP11D volume scan pattern radar compared to VCP21D mode.
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