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Investigation of Ice Microphysics using Simultaneous Measurements at C- and Ka-Band

Hagen, Martin and Ewald, Florian and Groß, Silke Martha and Li, Qiang and Mayer, Bernhard and Zinner, Tobias (2018) Investigation of Ice Microphysics using Simultaneous Measurements at C- and Ka-Band. 10th European Conference on Radar in Meteorology and Hydrology, 2.-6. Juli 2018, Ede, Niederlande.

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Official URL: https://www.erad2018.nl/

Abstract

The synergy of radars with different wavelength provides additional information on the physics of clouds and precipitation. While C-band weather radars are not sensitive enough to detect small ice and water particles, almost no attenuation is observed for weak to medium precipitation. On the other hand, Ka-band cloud radars are sensitive to detect small ice and water particles. However, attenuation limits the ability to perform measurements in rain. Synchronous RHI scans are being performed with DLR’s dual-polarization C-band radar POLDIRAD and a Mira-36 Ka-band cloud radar operated at the University of Munich. The two radars are separated by a distance of about 23 km and have an overlapping measurement range of about 30 km. Both reflectivity measurements agree quite well in the reflectivity range between -10 to 10 dBz. For lower reflectivity values the measurements with the C-band radar are limited to short ranges. At reflectivity values above 15 dBz attenuation effects at Ka-band are visible. Interestingly in ice clouds the overlapping region of both radars is quite large and the C-band radar has a high detection efficiency in ice clouds. This gives evidence on the presence of larger ice particles were the backscatter is sufficient high enough due to the D^6 dependence. The high sensitivity on ice particles in the combination of both frequencies allows for the investigation of the initiation of precipitation through the ice phase - the cold rain process. The dual-wavelength measurements will provide an enhanced hydrometeor classification and enable for the retrieval of ice microphysics parameters like effective radius and ice water content IWC. Other processes observable will be drizzle formation, cloud glaciation, distinction between depositional growth of small ice particles and onset of quicker ice particle growth into precipitation sized particles by aggregation, and initiation of first precipitation at the surface.

Item URL in elib:https://elib.dlr.de/122634/
Document Type:Conference or Workshop Item (Speech)
Title:Investigation of Ice Microphysics using Simultaneous Measurements at C- and Ka-Band
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hagen, MartinDLR, IPAhttps://orcid.org/0000-0003-4714-0775
Ewald, FlorianDLR, IPAhttps://orcid.org/0000-0002-5899-0890
Groß, Silke MarthaDLR, IPAhttps://orcid.org/0000-0002-7467-9269
Li, QiangDLR, IPAUNSPECIFIED
Mayer, BernhardLMU Münchenhttps://orcid.org/0000-0002-3358-0190
Zinner, TobiasLMU MünchenUNSPECIFIED
Date:4 July 2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:weather radar, ice microphysics, dual-frequency
Event Title:10th European Conference on Radar in Meteorology and Hydrology
Event Location:Ede, Niederlande
Event Type:international Conference
Event Dates:2.-6. Juli 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Hagen, Dr.rer.nat. Martin
Deposited On:08 Nov 2018 07:28
Last Modified:31 Jul 2019 20:20

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