Use of Specific Attenuation for Rainfall Measurement at X-Band Radar Wavelengths. Part 2: Rainfall Estimates and Comparison with Rain Gauges
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| Title: | Main Title: Use of Specific Attenuation for Rainfall Measurement at X-Band Radar Wavelengths. Part 2: Rainfall Estimates and Comparison with Rain Gauges |
| Description: | Abstract: In a series of two papers, rain rate retrievals based on specific attenuation at radar X-band wave length using the R(A) method presented by Ryzhkov et al. (2014) are thoroughly investigated. We use continuous time series of overlapping measurements from two polarimetric X-band weather radars in Germany during summer of 2011-2013 to analyze various aspects of the method, like miscalibration correction, ground clutter contamination, partial beam blockage (PBB), sensitivity to precipitation characteristics, and sensitivity to temperature assumptions in the retrievals. In part I of the series, we use the relations inherent to the R(A) method to calculate radar reflectivity Z from specific attenuation, and compare it with measured reflectivity to estimate PBB and calibration errors for both radars. In this second paper, R(A) rain estimates are compared to R(Z) and R(KDP)-based retrievals. PBB and calibration corrections derived in Part I made the R(Z) rainfall estimates almost perfectly consistent. Accumulated over 5 summer months, rainfall maps showed strong effects of clutter contamination if R(KDP) is used, and weaker impact on R(A). These effects could be reduced by processing the phase shift measurements with more resilience towards ground clutter contamination, and by substituting problematic R(KDP) or R(A) estimates with R(Z). Hourly and daily accumulations from rain estimators are compared with rain gauge measurements; the results show that R(A) complemented by R(Z) in segments with low total differential phase shift correlates best with gauges and has the lowest bias and RMSE, followed by R(KDP) substituted with R(Z) at rain rates below 8 mm/h. |
| Identifier: | 10.1175/JHM-D-14-0067.1 (DOI) |
| Citation Advice: | Malte Diederich, Alexander Ryzhkov, Clemens Simmer, Pengfei Zhang, and Silke Trömel, 2015: Use of Specific Attenuation for Rainfall Measurement at X-Band Radar Wavelengths. Part II: Rainfall Estimates and Comparison with Rain Gauges. J. Hydrometeor, 16, 503–516. doi: http://dx.doi.org/10.1175/JHM-D-14-0067.1 |
Responsible Party
| Creators: | Malte Diederich (Author), Alexander Ryzhkov (Author), Clemens Simmer (Author), Pengfei Zhang (Author), Silke Trömel (Author) |
| Publisher: | American Meteorological Society |
| Publication Year: | 2015 |
Topic
| TR32 Topic: | Atmosphere |
| Related Subprojects: | Z2, D5 |
| Subjects: | Keywords: Rainfall Data, Radar/X-Band, Radar, Atmospheric Measurement |
File Details
| Filename: | Diederich_2015_JHM_Part2.pdf |
| Data Type: | Text - Article |
| Size: | 14 Pages |
| File Size: | 2.6 MB |
| Date: | Copyrighted: 01.04.2015 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
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| Download Permission: | Only Project Members |
| General Access and Use Conditions: | According to the TR32DB data policy agreement. |
| Access Limitations: | According to the TR32DB data policy agreement. |
| Licence: | [TR32DB] Data policy agreement |
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Specific Information - Publication
| Publication Status: | Published |
| Review Status: | Peer reviewed |
| Publication Type: | Article |
| Article Type: | Journal |
| Source: | Journal of Hydrometeorology |
| Source Website: | http://journals.ametsoc.org/loi/hydr |
| Issue: | 2 |
| Volume: | 16 |
| Number of Pages: | 14 (503 - 516) |
Metadata Details
| Metadata Creator: | Malte Diederich |
| Metadata Created: | 08.07.2015 |
| Metadata Last Updated: | 08.07.2015 |
| Subproject: | Z2 |
| Funding Phase: | 3 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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