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Identification of Snow and Rain at the Surface using Polarimetric Radar

Hagen, Martin and Dalphinet, Alice (2012) Identification of Snow and Rain at the Surface using Polarimetric Radar. 7th European Conference on Radar in Meteorology and Hydrology, 25.-29. Juni 2012, Toulouse, Frankreich.

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Official URL: http://www.meteo.fr/cic/meetings/2012/ERAD/

Abstract

The transition from rain to snow at the surface is one of the challenging facts in aviation and road traffic during winter weather condition. Even though numerical weather forecast is able to provide reasonable forecasts, nowcasting applications still suffer from the precise observation of the transition from rain to snow at the surface. The application of dual-polarization radar has shown that fuzzy logic allows classifying hydrometeors in distinct classes. However, some uncertainty exists in the distinction between light rainfall and light snowfall. The knowledge of temperature can help in this situation, but is often not available with the desired quality and for three-dimensional the region of interest. Further uncertainty is caused by the fact that radar does not measure at the surface but at several hundred meters above the surface. For an improved classification of surface precipitation we identify the height of the melting layer first. The height of the melting layer is then included in the fuzzy classification process. This allows a more reliable distinction between rain (below) and snow (above). In the presentation we will show results from this algorithm using the DLR multi-polarization C-band weather radar POLDIRAD including a verification using ground based observations at Munich airport (disdrometer and human METAR observations) as well as measurements with a vertical pointing Doppler micro rain radar.

Document Type:Conference or Workshop Item (Speech)
Title:Identification of Snow and Rain at the Surface using Polarimetric Radar
Authors:
AuthorsInstitution or Email of Authors
Hagen, Martinmartin.hagen@dlr.de
Dalphinet, AliceMeteo France, Lille, F
Date:25 June 2012
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:Weather radar, polarimetry, hydrometeor classification, rain, snow
Event Title:7th European Conference on Radar in Meteorology and Hydrology
Event Location:Toulouse, Frankreich
Event Type:international Conference
Event Dates:25.-29. Juni 2012
HGF - Research field:Aeronautics, Space and Transport, Aeronautics, Space and Transport
HGF - Program:Space, Aeronautics
HGF - Program Themes:Earth Observation, ATM and Operation
DLR - Research area:Raumfahrt, Aeronautics
DLR - Program:R EO - Erdbeobachtung, L AO - Air Traffic Management and Operation
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung, L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Dr.rer.nat. Martin Hagen
Deposited On:24 Sep 2012 13:22
Last Modified:11 Feb 2013 15:03

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