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Sea-Ice Reflectivity Modelling and Estimation: Results on GNSS Reflectometry from Expeditions to the Arctic

Semmling, Maximilian und Wickert, Jens und Hoque, Mohammed Mainul und Divine, Dmitry und Gerland, Sebastian und Spreen, Gunnar (2022) Sea-Ice Reflectivity Modelling and Estimation: Results on GNSS Reflectometry from Expeditions to the Arctic. 11th ESA-NRSCC GNSS-R Workshop, 2022-10-26 - 2022-10-28, Virtual.

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Kurzfassung

GNSS signals are transmitted in L-band and provide a promising source for sea-ice remote sensing as they partly penetrate into ice upon reflection. The sea-ice surface and its composing layers below contribute to the reflected signal. Analysing these contributions allow to investigate sea-ice properties (ice thickness and ice type). We present here calculations of sea-ice reflectivity for GNSS signals based on a multilayer reflection model including: underlying water, a sea-ice layer and an additional snow cover. The calculations assume coherent reflection conditions, elevation angles of the GNSS satellite between 3° and 30°, as well as, the different media with their relative permittivity (dry snow ~1, multiyear ice ~3, high-salinity ice ~5 and sea water ~70). The model-based results show that oscillation pattern occur in the reflectivity profiles when the permittivity and conductivity (the permittivity's imaginary part) are low in the considered layers (ice and snow). The model results are compared to reflectivity profiles estimated from reflectometry data recorded during Arctic expeditions of research vessels. The comparison shows that the calculated oscillation pattern can also be found in the estimated profiles. This result fits the rather old ice types (second- or multiyear ice) reported for the expeditions by ancillary data. These results are promising for further investigations of sea-ice reflectometry preparing the upcoming ESA satellite mission PRETTY with coverage in the Arctic. However, agreement of applied model and observations is still limited to coherent reflection conditions. A future extension of the model to diffuse scatter contribution might be beneficial as well.

elib-URL des Eintrags:https://elib.dlr.de/193355/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Sea-Ice Reflectivity Modelling and Estimation: Results on GNSS Reflectometry from Expeditions to the Arctic
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Semmling, MaximilianMaximilian.Semmling (at) dlr.dehttps://orcid.org/0000-0002-5228-8072NICHT SPEZIFIZIERT
Wickert, JensGeoForschungsZentrum Potsdamhttps://orcid.org/0000-0002-7379-5276NICHT SPEZIFIZIERT
Hoque, Mohammed MainulMainul.Hoque (at) dlr.dehttps://orcid.org/0000-0001-5134-4901NICHT SPEZIFIZIERT
Divine, DmitryDmitry.Divine (at) npolar.noNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Gerland, SebastianNorwegian Polar Institute, Fram Centre, Tromsø, Norwayhttps://orcid.org/0000-0002-2295-9867NICHT SPEZIFIZIERT
Spreen, GunnarUniversity of Bremen, IUP, Germanyhttps://orcid.org/0000-0003-0165-8448NICHT SPEZIFIZIERT
Datum:2022
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:GNSS reflectometry, Arctic Ocean, Sea-ice
Veranstaltungstitel:11th ESA-NRSCC GNSS-R Workshop
Veranstaltungsort:Virtual
Veranstaltungsart:Workshop
Veranstaltungsbeginn:26 Oktober 2022
Veranstaltungsende:28 Oktober 2022
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 - Solar-Terrestrische Physik SO
Standort: Neustrelitz
Institute & Einrichtungen:Institut für Solar-Terrestrische Physik > Weltraumwetterbeobachtung
Hinterlegt von: Semmling, Dr. Maximilian
Hinterlegt am:23 Mär 2023 07:40
Letzte Änderung:24 Apr 2024 20:54

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