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2024

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cc-by (c) Peinó, E. et al., 2024
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/218272

Validation of GPM DPR Rainfall and Drop Size Distributions Using Disdrometer Observations in the Western Mediterranean

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https://doi.org/10.3390/rs16142594

Abstract

Dual-frequency precipitation radar (DPR) on the Core GPM satellite provides spaceborne three-dimensional observations of precipitation fields and surface rainfall rate with quasi-global coverage. The present study evaluates the behavior of liquid precipitation intensity, radar reflectivity factor (ZKu and ZKa) and drop size distribution (DSD) parameters (weighted mean diameter Dm and intercept parameter Nw) of the GPM DPR-derived products, version 07, from 2014 to 2023. Observations from seven Parsivel disdrometers located in different topographic zones in the Western Mediterranean are taken as ground references. Four matching techniques between satellite estimates and ground level observations were tested, and the best results were found for the so-called optimal comparison approach. Overall, GPM DPR products captured the variability of the observed DSD well at different rainfall intensities. However, overestimation of the mean Dm and underestimation of the mean Nw were observed, being much more sensitive to errors in drop diameters larger than 1.5 mm. Moreover, the lowest errors were found for radar reflectivity factor and Dm, and the highest for Nw and rainfall rate. In addition, the GPM DPR convective and stratiform classification was tested, and a substantial overestimation of stratiform cases compared to disdrometer observations were found.

Subject

Mediterrània occidental, Precipitacions (Meteorologia), Radar

Subject (English)

Western Mediterranean, Precipitations (Meteorology), Radar

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Articles publicats en revistes (Física Aplicada)

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PEINÓ, Eric, et al. Validation of GPM DPR Rainfall and Drop Size Distributions Using Disdrometer Observations in the Western Mediterranean. Remote Sensing. 2024. Vol. 16, num. 14, pags. 1-23. ISSN 2072-4292. [consulted: 15 of August of 2026]. Available at: https://hdl.handle.net/2445/218272

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