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Exploring the potential of TanDEM-X dual-polarization time series to monitor snow accumulation on an Alpine glacier

Schoenfeldt, Miriam und Parrella, Giuseppe und Hajnsek, Irena (2019) Exploring the potential of TanDEM-X dual-polarization time series to monitor snow accumulation on an Alpine glacier. ESA POLinSAR Workshop, 2019-01-28 - 2019-02-01, Frascati, Italy.

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Kurzfassung

Mass balance is a key indicator of the dynamics of a glacier. It is defined as the difference between the mass gained by accumulation and the mass lost due to ablation processes. Snow accumulation represents a major contribution to the accumulation term and its knowledge is therefore strictly required for the estimation of mass balance. So far, snow accumulation is being measured mainly by means of sparse weather stations which provide only point measurements. Snow maps for larger areas are obtained by spatially interpolating data from stations at different locations with the help of meteorological models. In the last decades, space-borne radar remote sensing has led to significant developments in the field of glaciology, due to the large spatial coverage with a relative short revisit time and a high spatial resolution. Thanks to the penetration capability of microwaves into dry snow and ice, conventional SAR systems are able to sense the surface as well as subsurface layers of glaciers and ice sheets, providing a tool to access information about the structure of the shallow snow-cover. This study investigates the potential of dual-polarimetric (HH/VV) TanDEM-X time series to monitor snow accumulation over the Aletsch glacier, in the Swiss Alps. In particular, co-polarization phase differences are employed to detect snowfall events, as shown already in for the case of snow-covered soil. Furthermore, the propagation model described in is adopted to link phase differences to fresh snow properties, like structural anisotropy, density and thickness, and to invert fresh snow depth from TanDEM-X data. Based on the inversion results, a simple algorithm has been developed to obtain an estimate of the temporal evolution of the snow height on the glacier surface. Preliminary results show that the proposed approach is able to provide a good estimate of the snow accumulation, as confirmed by snow depth measurements from a weather station nearby the glacier. However, a number of limitations remain, mainly related to the relatively low temporal sampling (11-day) offered by TanDEM-X and the need of some a priori knowledge about fresh snow density and structural anisotropy, which require further investigations.

elib-URL des Eintrags:https://elib.dlr.de/125679/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Exploring the potential of TanDEM-X dual-polarization time series to monitor snow accumulation on an Alpine glacier
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schoenfeldt, MiriamNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Parrella, GiuseppeGiuseppe.Parrella (at) dlr.dehttps://orcid.org/0000-0002-9174-7331NICHT SPEZIFIZIERT
Hajnsek, IrenaIrena.Hajnsek (at) dlr.dehttps://orcid.org/0000-0002-0926-3283NICHT SPEZIFIZIERT
Datum:Februar 2019
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Snow height, SAR polarimetry, snow anisotropy, TanDEM-X
Veranstaltungstitel:ESA POLinSAR Workshop
Veranstaltungsort:Frascati, Italy
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:28 Januar 2019
Veranstaltungsende:1 Februar 2019
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Multi-dimensionale SAR-Auswertung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Hochfrequenztechnik und Radarsysteme > Radarkonzepte
Hinterlegt von: Parrella, Dr. sc. Giuseppe
Hinterlegt am:09 Jan 2019 15:49
Letzte Änderung:24 Apr 2024 20:29

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