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Snow Water Equivalent of Dry Snow Measured by Differential Interferometry

Leinss, Silvan und Wiesmann, A. und Lemmetyinen, Juha und Hajnsek, Irena (2015) Snow Water Equivalent of Dry Snow Measured by Differential Interferometry. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 8 (8), 3773 -3790. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/JSTARS.2015.2432031. ISSN 1939-1404.

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Offizielle URL: http://ieeexplore.ieee.org/

Kurzfassung

Large scale mapping of snow water equivalent (SWE) is a long-lasting request in many scientific and economical fields. Active and passive microwave remote sensing methods are explored, as local methods cannot be generalized due to the spatial inhomogeneity of the snow pack. Microwaves interact with snow by absorption, scattering, and refraction. For dry snow of a few meters depth and frequencies below 20 GHz, absorption and scattering in the snow volume are negligible compared with the backscattered energy from the underlying ground. The signal delay caused by refraction can be measured with differential radar interferometry, but phase wrapping errors and temporal decorrelation must be considered. We demonstrate that large ΔSWE can be accurately determined from dense time series of differential interferograms at Xand Ku-band by temporal integration. Lost phase cycles are reconstructed with a two-frequency approach. Temporal decorrelation is minimized by a temporal resolution of 4 h. A linear function between ΔSWE and phase difference is derived, which deviates only a few percent from the exact solution and which depends negligibly on snow density and stratigraphy. ΔSWE retrieved from observations of the SnowScat instrument (SSI) were validated against observed SWE from different reference instruments, installed at a test site near the town of Sodankylä, Finland. An accuracy below ±6 mm SWE was achieved at frequencies of 10 and 16 GHz for up to 200 mm of ΔSWE. An exceptionally high temporal coherence was observed for up to 30 days for dry snow, whereas for wet snow it decayed within hours.

elib-URL des Eintrags:https://elib.dlr.de/100787/
Dokumentart:Zeitschriftenbeitrag
Titel:Snow Water Equivalent of Dry Snow Measured by Differential Interferometry
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Leinss, SilvanETH ZürichNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wiesmann, A.GAMMANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Lemmetyinen, JuhaFMI, Arctic Research, Sodankylä, FinlandNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hajnsek, IrenaNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:April 2015
Erschienen in:IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:8
DOI:10.1109/JSTARS.2015.2432031
Seitenbereich:3773 -3790
Verlag:IEEE - Institute of Electrical and Electronics Engineers
Name der Reihe:IEEE Xplore
ISSN:1939-1404
Status:veröffentlicht
Stichwörter:snow water equivalent (SWE), Microwaves, differential radar interferometry
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: Radzuweit, Sibylle
Hinterlegt am:11 Dez 2015 09:28
Letzte Änderung:23 Jul 2022 13:44

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