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Sea-ice signatures in coherently reflected GNSS signals: Findings of the MOSAiC expedition

Semmling, Maximilian and Wickert, Jens and Kreß, Frederik and Hoque, Mohammed Mainul and Divine, Dmitry V. and Gerland, Sebastian (2021) Sea-ice signatures in coherently reflected GNSS signals: Findings of the MOSAiC expedition. IAG 2021, 28. Jun. - 02. Jul. 2021, Beijing, China.

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Sea ice is a crucial parameter in the Earth climate system. Its high albedo compared to water influences the oceans' radiation budget. The state of sea ice is highly variable due to seasonal change and global warming. GNSS reflectometry can contribute to global monitoring sea ice. Properties like ice salinity, temperature and thickness affect the signal reflection. The MOSAiC expedition (Multidisciplinary drifting Observatory for the Study of Arctic Climate) gave the opportunity to conduct reflectometry measurements under different sea-ice conditions in the Arctic. A dedicated setup was mounted, in close cooperation with the Alfred-Wegener-Institute (AWI), on the German research icebreaker Polarstern that drifted during nine months with the Arctic sea ice. Here, results from the expedition's first leg in autumn 2019 are presented when the ship started drifting at about 85°N to 87°N in the Siberian Sector of the Arctic. Profiles of sea-ice reflectivity are derived with daily resolution considering reflection data recorded at left-handed (LH) and righthanded (RH) circular polarization. Respective predictions of reflectivity are provided assuming reflection models of bulk sea ice or a sea-ice slab. The later allows to include the effect of signal penetration down to the underlying water. Results of comparison between LH profiles and bulk model confirm that the reflectivity decreases (about 10 dB) when the ship goes into compact sea ice. In the central Arctic period anomaly signatures in observed reflectivity occur. The comparison of signatures and applied models (bulk and slab) indicate the role of coherent signal penetration into the ice. Salinity and temperature of sea ice have influence on these signatures. We conclude that estimation of ice type/salinity and temperature can profit from grazing angle GNSS reflectometry. Future studies will proceed to investigate these signatures in coherent observations.

Item URL in elib:https://elib.dlr.de/143534/
Document Type:Conference or Workshop Item (Poster)
Title:Sea-ice signatures in coherently reflected GNSS signals: Findings of the MOSAiC expedition
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Semmling, MaximilianUNSPECIFIEDhttps://orcid.org/0000-0002-5228-8072UNSPECIFIED
Divine, Dmitry V.Norwegian Polar Institute, Fram Centre, Tromsø, NorwayUNSPECIFIEDUNSPECIFIED
Gerland, SebastianNorwegian Polar Institute, Fram Centre, Tromsø, Norwayhttps://orcid.org/0000-0002-2295-9867UNSPECIFIED
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:GNSS reflectometry, remote sensing, sea ice
Event Title:IAG 2021
Event Location:Beijing, China
Event Type:international Conference
Event Dates:28. Jun. - 02. Jul. 2021
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication, Navigation, Quantum Technology
DLR - Research area:Raumfahrt
DLR - Program:R KNQ - Communication, Navigation, Quantum Technology
DLR - Research theme (Project):R - Ionosphere
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Space Weather Observation
Deposited By: Semmling, Dr. Maximilian
Deposited On:16 Aug 2021 14:35
Last Modified:29 Mar 2023 00:48

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