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Anisotropy of seasonal snow measured by polarimetric phase differences in radar time series

Leinss, Silvan and Löwe, H. and Proksch, M. and Lemmetyinen, Juha and Wiesmann, A. and Hajnsek, Irena (2015) Anisotropy of seasonal snow measured by polarimetric phase differences in radar time series. The Cryosphere, 9 (6), pp. 6061-6123. Copernicus Publications. ISSN 1994-0416

Full text not available from this repository.

Official URL: http://www.the-cryosphere-discuss.net/9/issue6.html

Abstract

Snow settles under the force of gravity and recrystallizes by vertical temperature gradients. Both effects are assumed to form oriented ice crystals which induce an anisotropy in mechanical, thermal, and dielectric properties of the snow pack. On microscopic scales, the anisotropy could be hitherto determined only from stereology or computer tomography of samples taken from snow pits. In this paper we present an alternative method and show how the anisotropy of a natural snow pack can be observed contact- and destruction-free with polarimetric radar measurements. The copolar phase differences (CPD) of polarized microwaves transmitted through dry snow were analyzed for four winter seasons (2009–2013) from the SnowScat Instrument, installed at a test site near the town of Sodankylä, Finnland. An electrodynamic model was established based on anisotropic optics and on Maxwell–Garnett-type mixing formulas to provide a link between the structural anisotropy and the measured CPD. The anisotropy values derived from the CPD were compared with in-situ anisotropy measurements obtained by computer tomography. In addition, we show that the CPD measurements obtained from SnowScat show the same temporal evolution as space-borne CPD measurements from the satellite TerraSAR-X. The presented dataset provides a valuable basis for the future development of snow models capable of including the anisotropic structure of snow.

Item URL in elib:https://elib.dlr.de/100786/
Document Type:Article
Title:Anisotropy of seasonal snow measured by polarimetric phase differences in radar time series
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Leinss, SilvanETH ZurichUNSPECIFIED
Löwe, H.WSL Inst. for Snow and Avalanche Research SLF, Davos, CHUNSPECIFIED
Proksch, M.WSL Inst. for Snow an Avalanche Research SLF, Davos, CHUNSPECIFIED
Lemmetyinen, JuhaFMI, Arctic Research, Sodankylä, FinlandUNSPECIFIED
Wiesmann, A.GAMMAUNSPECIFIED
Hajnsek, IrenaUNSPECIFIEDUNSPECIFIED
Date:5 November 2015
Journal or Publication Title:The Cryosphere
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:9
Page Range:pp. 6061-6123
Publisher:Copernicus Publications
ISSN:1994-0416
Status:Published
Keywords:anisotropy, computer tomography,polarimetric radar, CPD
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 Multi-dimensionale SAR-Auswertung
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Radzuweit, Sibylle
Deposited On:11 Dec 2015 09:27
Last Modified:09 Jan 2019 12:23

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