[712] - Polarimetric estimates of a one month accumulation of light rain with a 3-cm wavelength radar

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Borowska, L., Zrnic, D., Ryzhkov, A., Zhang, P., Simmer, C., 2011. Polarimetric estimates of a one month accumulation of light rain with a 3-cm wavelength radar. Journal of Hydrometeorology, 12, 1024 - 1039. DOI: 10.1175/2011JHM1339.1.
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Title(s):Main Title: Polarimetric estimates of a one month accumulation of light rain with a 3-cm wavelength radar
Description(s):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(s):DOI: 10.1175/2011JHM1339.1
Responsible Party
Creator(s):Author: Lesya Borowska
Author: Dusan Zrnic
Author: Alexander Ryzhkov
Author: Pengfei Zhang
Author: Clemens Simmer
Publisher:American Meteorological Society
TR32 Topic:Atmosphere
Subject(s):CRC/TR32 Keywords: Meteorology, Remote Sensing, Radar/X-Band, Rainfall Data
File Details
File Name:2011_Borowska_JoHM.pdf
Data Type:Text
Size(s):16 Pages
File Size:1516 kB (1.48 MB)
Date(s):Date Submitted: 2011-01-09
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
Measurement Region:RurCatchment
Measurement Location:--RurCatchment--
Specific Informations - Publication
Article Type:Journal
Source:Journal of Hydrometeorology
Number Of Pages:16
Page Range:1024 - 1039
Metadata Details
Metadata Creator:Lesya Borowska
Metadata Created:2013-12-03
Metadata Last Updated:2013-12-03
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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