GPM Level 1 Requirements Validation with Groundbased Dual-polarization radars

The two advanced instruments onboard the Global Precipitation Measurement (GPM) Core Observatory satellite, namely, Dual-frequency Precipitation Radar (DPR) and GPM Microwave Imager (GMI), can provide detailed precipitation observations over most of the globe. As an integral part of the GPM mission, ground validation helps to quantify precipitation measurement uncertainty and provide insight into the physical and statistical basis of GPM retrieval algorithms. Therein ground-based dual-polarization radar has shown great potential to estimate surface rainfall rate and amount. The combination of dual-polarization measurements and environmental temperature information is also capable of identifying different hydrometeor types over the radar illuminated scanning volumes. This paper presents the validation of GPM level1 requirements as part of the GPM ground validation effort. The requirements validations using the high resolution DFW CASA radar network as well as target of opportunity dual-polarization radars are presented. The ground radar based hydrometeor classification methodology implemented in the validation study will be described.. In addition, the high-resolution urban radar network deployed in Dallas-Fort Worth is used for detailed evaluation of instantaneous rainfall rate product of GPM. Quantitative evaluation of GPM rainfall products and statistical analysis between GPM and ground radar snowfall products will be provided based on a large number of GPM satellite overpass cases.