Universität zu Köln

Schoger, Sybille Y., Moisseev, Dmitri ORCID: 0000-0002-4575-0409, von Lerber, Annakaisa, Crewell, Susanne ORCID: 0000-0003-1251-5805 and Ebell, Kerstin ORCID: 0000-0002-0042-4968 (2021). Snowfall-Rate Retrieval for K- and W-Band Radar Measurements Designed in Hyytiala, Finland, and Tested at Ny-angstrom lesund, Svalbard, Norway. J. Appl. Meteorol. Climatol., 60 (3). S. 273 - 290. BOSTON: AMER METEOROLOGICAL SOC. ISSN 1558-8432

Full text not available from this repository.

Abstract

Two power-law relations linking equivalent radar reflectivity factor Z(e) and snowfall rate S are derived for a K-band Micro Rain Radar (MRR) and for a W-band cloud radar. For the development of these Z(e)-S relationships, a dataset of calculated and measured variables is used. Surface-based video-disdrometer measurements were collected during snowfall events over five winters at the high-latitude site in Hyytiala, Finland. The data from 2014 to 2018 include particle size distributions (PSD) and their fall velocities, from which snowflake masses were derived. The K- and W-band Z(e) values are computed using these surface-based observations and snowflake scattering properties as provided by T-matrix and single-particle scattering tables, respectively. The uncertainty analysis shows that the K-band snowfall-rate estimation is significantly improved by including the intercept parameter N-0 of the PSD calculated from concurrent disdrometer measurements. If N-0 is used to adjust the prefactor of the Z(e)-S relationship, the RMSE of the snowfall-rate estimate can be reduced from 0.37 to around 0.11 mm h(-1). For W-band radar, a Z(e)-S relationship with constant parameters for all available snow events shows a similar uncertainty when compared with the method that includes the PSD intercept parameter. To demonstrate the performance of the proposed Z(e)-S relationships, they are applied to measurements of the MRR and the W-band microwave radar for Arctic clouds at the Arctic research base operated by the German Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI) and the French Polar Institute Paul Emile Victor (IPEV) (AWIPEV) in Ny-angstrom lesund, Svalbard, Norway. The resulting snowfall-rate estimates show good agreement with in situ snowfall observations while other Z(e)-S relationships from literature reveal larger differences.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schoger, Sybille Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moisseev, Dmitri UNSPECIFIED orcid.org/0000-0002-4575-0409 UNSPECIFIED von Lerber, Annakaisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Crewell, Susanne UNSPECIFIED orcid.org/0000-0003-1251-5805 UNSPECIFIED Ebell, Kerstin UNSPECIFIED orcid.org/0000-0002-0042-4968 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-580553
DOI:	10.1175/JAMC-D-20-0095.1
Journal or Publication Title:	J. Appl. Meteorol. Climatol.
Volume:	60
Number:	3
Page Range:	S. 273 - 290
Date:	2021
Publisher:	AMER METEOROLOGICAL SOC
Place of Publication:	BOSTON
ISSN:	1558-8432
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MICROPHYSICAL PROPERTIES; SIZE DISTRIBUTION; A-TRAIN; PART I; CLOUDS; ALESUND; RAIN; BACKSCATTERING; REFLECTIVITY; SCATTERING Multiple languages Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58055