Calibration of Two X-Band Ground Radars Against GPM DPR Ku-Band
Weather radars are essential in the Quantitative Precipitation Estimates (QPE) but are susceptible to calibration errors. Previous work demonstrated that observations from the Ku-band Dual Polarization Radar (DPR) radar on board the Global Precipitation Measurement Mission Dual-Precipitation Radar (...
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MDPI AG
2025-05-01
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| Online Access: | https://www.mdpi.com/2072-4292/17/10/1712 |
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| author | Eleni Loulli Silas Michaelides Johannes Bühl Athanasios Loukas Diofantos Hadjimitsis |
| author_facet | Eleni Loulli Silas Michaelides Johannes Bühl Athanasios Loukas Diofantos Hadjimitsis |
| author_sort | Eleni Loulli |
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| description | Weather radars are essential in the Quantitative Precipitation Estimates (QPE) but are susceptible to calibration errors. Previous work demonstrated that observations from the Ku-band Dual Polarization Radar (DPR) radar on board the Global Precipitation Measurement Mission Dual-Precipitation Radar (GPM) are suitable for ground radar calibration. Several studies volume-matched ground radar and GPM DPR Ku-band reflectivities for the absolute calibration of ground radars, by applying different constraints and filters in the volume-matching procedure. This study compares and evaluates volume-matching thresholds and data filtering schemes for the Rizoelia, Larnaca (LCA) and Nata, Pafos (PFO) radars of the Cyprus weather radar network from October 2017 till May 2023. Excluding reflectivities below and within the melting layer with a 250 m buffer yielded consistent results for both ground radars. The selected calibration schemes were combined, and the resulting offsets were compared to stable radar parameters to identify stable calibration periods. The consistency of the wet hydrological year October 2019 to September 2020 suggests that radar calibration results are prone to differences in meteorological conditions, as scarce rainfall can result in insufficient data for reliable calibration. Future work will incorporate disdrometer measurements and extend the analysis to quantitative precipitation estimation. |
| format | Article |
| id | doaj-art-c8f0ece44d8e4b2f8932d175a83dcf4a |
| institution | OA Journals |
| issn | 2072-4292 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
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| series | Remote Sensing |
| spelling | doaj-art-c8f0ece44d8e4b2f8932d175a83dcf4a2025-08-20T01:56:45ZengMDPI AGRemote Sensing2072-42922025-05-011710171210.3390/rs17101712Calibration of Two X-Band Ground Radars Against GPM DPR Ku-BandEleni Loulli0Silas Michaelides1Johannes Bühl2Athanasios Loukas3Diofantos Hadjimitsis4Department of Civil Engineering and Geomatics, Faculty of Engineering and Technology, Cyprus University of Technology, 30 Arch. Kyprianos Str., 3036 Lemesos, CyprusERATOSTHENES Centre of Excellence, 82 Franklin Roosevelt, 3012 Lemesos, CyprusLeibniz Institute for Tropospheric Research (TROPOS), Permoserstraße 15, 04318 Leipzig, GermanySchool of Rural and Surveying Engineering, Faculty of Engineering, Aristotle University of Thessaloniki, 541 24 Thessaloniki, GreeceDepartment of Civil Engineering and Geomatics, Faculty of Engineering and Technology, Cyprus University of Technology, 30 Arch. Kyprianos Str., 3036 Lemesos, CyprusWeather radars are essential in the Quantitative Precipitation Estimates (QPE) but are susceptible to calibration errors. Previous work demonstrated that observations from the Ku-band Dual Polarization Radar (DPR) radar on board the Global Precipitation Measurement Mission Dual-Precipitation Radar (GPM) are suitable for ground radar calibration. Several studies volume-matched ground radar and GPM DPR Ku-band reflectivities for the absolute calibration of ground radars, by applying different constraints and filters in the volume-matching procedure. This study compares and evaluates volume-matching thresholds and data filtering schemes for the Rizoelia, Larnaca (LCA) and Nata, Pafos (PFO) radars of the Cyprus weather radar network from October 2017 till May 2023. Excluding reflectivities below and within the melting layer with a 250 m buffer yielded consistent results for both ground radars. The selected calibration schemes were combined, and the resulting offsets were compared to stable radar parameters to identify stable calibration periods. The consistency of the wet hydrological year October 2019 to September 2020 suggests that radar calibration results are prone to differences in meteorological conditions, as scarce rainfall can result in insufficient data for reliable calibration. Future work will incorporate disdrometer measurements and extend the analysis to quantitative precipitation estimation.https://www.mdpi.com/2072-4292/17/10/1712X-band polarimetric weather radarCyprus radar networkcalibrationGPM DPR Ku-bandmeteorological radarreflectivity |
| spellingShingle | Eleni Loulli Silas Michaelides Johannes Bühl Athanasios Loukas Diofantos Hadjimitsis Calibration of Two X-Band Ground Radars Against GPM DPR Ku-Band Remote Sensing X-band polarimetric weather radar Cyprus radar network calibration GPM DPR Ku-band meteorological radar reflectivity |
| title | Calibration of Two X-Band Ground Radars Against GPM DPR Ku-Band |
| title_full | Calibration of Two X-Band Ground Radars Against GPM DPR Ku-Band |
| title_fullStr | Calibration of Two X-Band Ground Radars Against GPM DPR Ku-Band |
| title_full_unstemmed | Calibration of Two X-Band Ground Radars Against GPM DPR Ku-Band |
| title_short | Calibration of Two X-Band Ground Radars Against GPM DPR Ku-Band |
| title_sort | calibration of two x band ground radars against gpm dpr ku band |
| topic | X-band polarimetric weather radar Cyprus radar network calibration GPM DPR Ku-band meteorological radar reflectivity |
| url | https://www.mdpi.com/2072-4292/17/10/1712 |
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