研究目的
To perform a ground validation of GPM Dual-frequency Precipitation Radar (DPR) with ground-based radars in Latin America and the Caribbean, assessing the potential of GPM to calibrate and monitor weather radars in the region.
研究成果
The comparison between Colombian radar and GPM shows high correlation (within 90%) and bias within 1dBZ, indicating the potential of Latin America and the Caribbean weather radars for DPR comparison and ground validation.
研究不足
The study is limited to specific regions in Latin America and the Caribbean, and only results from Colombian radars are fully presented. The comparison may be affected by differences in frequencies between the two systems, attenuation along different paths, and changes in the satellite orbit.
1：Experimental Design and Method Selection:
The study compares radar variables from GPM DPR and ground-based radars during overpasses, with attenuation and bias correction applied to ground radar data.
2：Sample Selection and Data Sources:
Data from dual polarized C-band weather radars in Colombia (Tablazo and San Andres Island) and Puerto Rico (NEXRAD Radar in San Juan) are used.
3：List of Experimental Equipment and Materials:
GPM DPR and ground-based radars (C-band and NEXRAD).
4：Experimental Procedures and Operational Workflow:
Overpasses of GPM over the region that ground radars cover are identified; data showing weather echo is analyzed after attenuation and bias correction.
5：Data Analysis Methods:
Metrics such as bias, correlation coefficient, and root mean square error are used to evaluate the comparison between GPM DPR and ground radar observations.
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