Use of Specific Attenuation for Rainfall Measurement at X-Band Radar Wavelengths. Part 1: Radar Calibration and Partial Beam Blockage Estimation

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*Title:*	Main Title: Use of Specific Attenuation for Rainfall Measurement at X-Band Radar Wavelengths. Part 1: Radar Calibration and Partial Beam Blockage Estimation
*Description:*	Abstract: In a two-part paper, radar rain rate retrievals using specific attenuation A suggested by Ryzhkov et al. (2014) are thoroughly investigated. We use continuous time series of overlapping measurements from two twin polarimetric X-band weather radars in Germany during summer 2011-2013 to analyze various aspects of the rain rate retrieval, including miscalibration correction, mitigation of ground clutter contamination and partial beam blockage (PBB), sensitivity to precipitation characteristics, and the temperature assumptions of the R(A) technique. In part I, we use the relations inherent to the R(A) method to estimate radar reflectivity Z from A and compare it to the measured Z in order to estimate PBB and calibration offsets for both radars. The fields of Z estimated from A for both radars are consistent, and the differences between Z(A) and measured Z are in good agreement with the ones calculated using either consistency relations between ZH, ZDR and KDP in rain or a digital elevation model in the presence of PBB. In our analysis, the dependence of A on temperature appears to have minimal effects on the overall performance of the method. As expected, the difference between Z(A) and attenuation-corrected measured Z observations varies with rain type, and exhibits a weak systematic dependency on rainfall intensity; thus averaging over several rain events is required to obtain reliable estimates of the Z biases caused by radar miscalibration and PBB.
*Identifier:*	10.1175/JHM-D-14-0066.1 (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 I: Radar Calibration and Partial Beam Blockage Estimation. J. Hydrometeor, 16, 487–502. doi: http://dx.doi.org/10.1175/JHM-D-14-0066.1

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

File Details

*Filename:*	Diederich_2015_JHM_Part1.pdf
*Data Type:*	Text - Article
*Size:*	16 Pages
*File Size:*	3.3 MB
*Date:*	Copyrighted: 01.04.2015
*Mime Type:*	application/pdf
*Data Format:*	PDF
*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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*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:*	16 (487 - 502)

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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