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Quality control for polarimetric radar measurements

Hagen, Martin and Friedrich, Katja (2005) Quality control for polarimetric radar measurements. 32nd Conference Radar Meteorology, 2005-10-24 - 2005-10-29, Albuquerque, NM (USA).

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Abstract

Polarimetric radar measurements have improved quantitative precipitation estimation especially for the derivation of precipitation amounts. Several weather services are planning therefore to upgrade their radars with polarimetric diversity capabilities. The quality of the rain rate estimation depends strongly on the quality of the polarimetric measurements themselves. A concept of a quality index will be presented will be transferred together with the observational data to the user. The quality index field is based on results achieved in research over the last 25 years and will contain information about (i) broadening of the radar beam and height of the first radar echo; (ii) ground clutter contamination and beam shielding; (iii) contamination by attenuation; (iv) homogeneous beam filling; and (v) a consistency check between reflectivity, differential reflectivity ratio, and differential propagation phase. While (i) to (iii) are also important for conventional weather radars, the later two are focus solely on polarimetric radar observations. The consistency check is used for instance to monitor the performance of the radar system and reveal areas consisting of rain. Since the assumptions for the consistency check are valid only in rain, this check will fail in regions with other types of hydrometeors. In those regions the polarimetric rain rate estimation is not possible and other, conventional, methods have to be used. For further refinement of the quality index field different weights for each factor can be set depending on the weather situation and the preferences of the user.

Document Type:Conference or Workshop Item (Speech)
Title:Quality control for polarimetric radar measurements
Authors:
AuthorsInstitution or Email of Authors
Hagen, MartinUNSPECIFIED
Friedrich, KatjaMeteoSchweiz, Locarno, Schweiz
Date:2005
Status:Published
Keywords:weather radar, polarimetry, quality control
Event Title:32nd Conference Radar Meteorology
Event Location:Albuquerque, NM (USA)
Event Type:international Conference
Event Dates:2005-10-24 - 2005-10-29
Organizer:Amer. Meteorol. Soc, Boston
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Dr.rer.nat. Martin Hagen
Deposited On:05 Dec 2005
Last Modified:27 Apr 2009 04:44

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