elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

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).

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Apparent Drop Shapes and Estimation of Rainfall by Polarimetric Radar
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Hagen, MartinNICHT SPEZIFIZIERT
Datum:6 September 2003
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:rain drops, weather radar, polarimetrie
Veranstaltungstitel:31st Conference on Radar Meteorology
Veranstaltungsort:Seattle, WA (USA)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2003-08-06 - 2003-08-12
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Wolkenphysik und Verkehrsmeteorologie
Hinterlegt von: Dr.rer.nat. Martin Hagen
Hinterlegt am:16 Jul 2007
Letzte Änderung:27 Apr 2009 14:05

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.