Polarimetric estimates of a one month accumulation of light rain with a 3-cm wavelength radar
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| Title: | Main Title: Polarimetric estimates of a one month accumulation of light rain with a 3-cm wavelength radar |
| Description: | Abstract: The authors evaluate rainfall estimates from the new polarimetric X-band radar at Bonn, Germany, for a period between mid-November and the end of December 2009 by comparison with rain gauges. The emphasis is on slightly more than 1-month accumulations over areas minimally affected by beam blockage. The rain regime was characterized by reflectivities mainly below 45 dBZ, maximum observed rain rates of 47 mm h21, a mean rain rate of 0.1 mm h21, and brightband altitudes between 0.6 and 2.4 km above the ground. Both the reflectivity factor and the specific differential phase are used to obtain the rain rates. The accuracy of rain total estimates is evaluated from the statistics of the differences between radar and rain gauge measurements. Polarimetry provides improvement in the statistics of reflectivity-based measurements by reducing the bias and RMS errors from 225% to 7% and from 33% to 17%, respectively. Essential to this improvement is separation of the data into those attributed to pure rain, those from the bright band, and those due to nonmeteorological scatterers. A type-specific (rain or wet snow) relation is applied to obtain the rain rate by matching on the average the contribution by wet snow to the radar-measured rainfall below the bright band. The measurement of rain using specific differential phase is the most robust and can be applied to the very low rain rates and still produce credible accumulation estimates characterized with a standard deviation of 11% but a bias of 225%. A composite estimator is also tested and discussed. |
| Identifier: | 10.1175/2011JHM1339.1 (DOI) |
Responsible Party
| Creators: | Lesya Borowska (Author), Dusan Zrnic (Author), Alexander Ryzhkov (Author), Pengfei Zhang (Author), Clemens Simmer (Author) |
| Publisher: | American Meteorological Society |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Atmosphere |
| Related Subproject: | D5 |
| Subjects: | Keywords: Meteorology, Remote Sensing, Radar/X-Band, Rainfall Data |
File Details
| Filename: | 2011_Borowska_JoHM.pdf |
| Data Type: | Text - Article |
| Size: | 16 Pages |
| File Size: | 1.5 MB |
| Date: | Submitted: 09.01.2011 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Project Members |
| General Access and Use Conditions: | For internal use only |
| Access Limitations: | For internal use only |
| 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 |
| Volume: | 12 |
| Number of Pages: | 16 (1024 - 1039) |
Metadata Details
| Metadata Creator: | Lesya Borowska |
| Metadata Created: | 03.12.2013 |
| Metadata Last Updated: | 03.12.2013 |
| Subproject: | D5 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 796 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 3 |
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