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Apparent Drop Shapes and Estimation of Rainfall by Polarimetric Radar

Hagen, Martin (2003) Apparent Drop Shapes and Estimation of Rainfall by Polarimetric Radar. 31st Conference on Radar Meteorology, 2003-08-06 - 2003-08-12, Seattle, WA (USA).

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Abstract

The knowledge of the exact shape of falling raindrops is essential for the retrieval of rainfall rate from measurements with polarimetric weather radar. Polarimetric radar parameters depend only on the drop shape. Despite the large number of studies performed in the past, no common parameterisation of the shape of falling raindrops is available yet. Equilibrium shapes have been determined by Pruppacher and Pitter (1971) or Beard et al. (1989). However, falling raindrops tend to oscillate, rotate, and tumble. All those motions affect the polarimetric radar parameters like differential reflectivity (ZDR) or differential propagation phase (KDP). Both parameters are commonly used to provide a better estimation of rainfall rate, than it would be possible with a classical Z-R relation. In the present study a simple oscillation model and canting angle model are used to simulate raindrops with various shapes. The scattering amplitudes at C-band frequencies are estimated and are recursively used to estimate an apparent drop shape of falling raindrops. Besides reflectivity weighting of different oscillation modes, this approach also considers deviations from Rayleigh scattering. The latter is relevant at C-band frequencies for raindrops with axis dimensions larger than about 3 mm. The apparent drop shape is also compared to polarimetric radar measurements.

Item URL in elib:https://elib.dlr.de/49901/
Document Type:Conference or Workshop Item (Speech)
Title:Apparent Drop Shapes and Estimation of Rainfall by Polarimetric Radar
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hagen, MartinUNSPECIFIEDUNSPECIFIED
Date:6 September 2003
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:rain drops, weather radar, polarimetrie
Event Title:31st Conference on Radar Meteorology
Event Location:Seattle, WA (USA)
Event Type:international Conference
Event Dates:2003-08-06 - 2003-08-12
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: Hagen, Dr.rer.nat. Martin
Deposited On:16 Jul 2007
Last Modified:27 Apr 2009 14:05

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