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GPM DPR Retrievals: Algorithm, Evaluation, and Validation
| Content Provider | MDPI |
|---|---|
| Author | Liao, Liang Meneghini, Robert |
| Copyright Year | 2022 |
| Description | The primary goal of the dual-frequency precipitation radar (DPR) aboard the Global Precipitation Measurement (GPM) Core Observatory satellite is to infer precipitation rate and raindrop/particle size distributions (DSD/PSD). The focus of this paper is threefold: (1) to describe the DPR retrieval algorithm that uses an adjustable relationship between rain rate (R) and the mass-weighted diameter $(D_{m}$) or an $R-D_{m}$ relationship in solving for R and $D_{m}$ simultaneously; (2) to evaluate the DPR algorithm based on the physical simulations that employ measured DSD/PSD to understand the mechanism and error characteristics of the retrieval method; (3) to review ground validation studies for DPR products as well as to analyze the strengths and weaknesses of ground radar and rain gauge/disdrometer validations. Overall, the DPR Version 6 algorithm provides reasonably accurate estimates of R and $D_{m}$ in rain. Non-uniformity in the rain profile, however, tends to degrade the accuracy of the R and $D_{m}$ estimates to some extent as the range-independent assumption of the adjustable parameter (ε) of the $R-D_{m}$ relation is not able to fully account for natural variation of DSD in the vertical profile. The DPR snow rate is underestimated as compared with the independent dual-frequency ratio (DFR) technique. This is possibly the result of the constraint associated with the path integral attenuation (PIA)/differential PIA (δPIA) used in the DPR algorithm to find the best ε and range-independent ε assumption. A range-variable ε model, proposed in the DPR Version 7 algorithm, is expected to improve rain and snow retrieval. |
| Starting Page | 843 |
| e-ISSN | 20724292 |
| DOI | 10.3390/rs14040843 |
| Journal | Remote Sensing |
| Issue Number | 4 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-02-11 |
| Access Restriction | Open |
| Subject Keyword | Remote Sensing Marine Engineering Imaging Science Gpm Dpr Dsd Psd Radar Rain and Snow Retrieval Gamma Distribution Dual-frequency Radar |
| Content Type | Text |
| Resource Type | Article |
