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Sea-ice permittivity derived from GNSS reflection profiles: Results of the MOSAiC expedition

Semmling, Maximilian and Wickert, Jens and Kreß, Frederik and Hoque, Mohammed Mainul and Divine, Dmitry and Gerland, Sebastian and Spreen, Gunnar (2021) Sea-ice permittivity derived from GNSS reflection profiles: Results of the MOSAiC expedition. IEEE Transactions on Geoscience and Remote Sensing. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2021.3121993. ISSN 0196-2892. (In Press)

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Reflectometry measurements have been conducted aboard the German research icebreaker Polarstern during the MOSAiC expedition (Multidisciplinary drifting Observatory for the Study of Arctic Climate). Signals of Global Navigation Satellite Systems (GNSS) were recorded using a dedicated GNSS reflectometry receiver for retrieval of sea-ice reflectivity. The primary goal is a reflectometry-based monitoring of sea ice as part of the Arctic climate study. The data set presented here covers the expedition's first leg (late Sep. to mid Dec. 2019) in the Siberian Sector of the central Arctic (at about 82°N to 87°N). Daily profiles of reflectivity are retrieved for satellite elevations < 45°. In agreement with model prediction the results show best reflectivity contrast (about 5 dB between compact pack-ice and lower ice concentrations) for observations at left-handed circular polarization and elevation angles of 10° to 20°. A daily resolved time series of sea-ice relative permittivity is inverted from the left-handed data. In general, the level of inversion results is at the lower limit of sea-ice values (rel. permittivity of 3 and below), potentially indicating an influence of incoherent volume scattering. Occasional increase of relative permittivity is attributed to the presence of water. Sea-ice profiles show anomalies that are confirmed by enhanced model prediction (slab reflection). A long-term comparison of prediction and retrieved profiles indicates anomalies' dependence on ice thickness and temperature.

Item URL in elib:https://elib.dlr.de/145664/
Document Type:Article
Title:Sea-ice permittivity derived from GNSS reflection profiles: Results of the MOSAiC expedition
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Semmling, MaximilianUNSPECIFIEDhttps://orcid.org/0000-0002-5228-8072
Wickert, JensGeoForschungsZentrum Potsdamhttps://orcid.org/0000-0002-7379-5276
Hoque, Mohammed MainulUNSPECIFIEDhttps://orcid.org/0000-0001-5134-4901
Gerland, SebastianNorwegian Polar Institute, Fram Centre, Tromsø, Norwayhttps://orcid.org/0000-0002-2295-9867
Spreen, GunnarUNSPECIFIEDhttps://orcid.org/0000-0003-0165-8448
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Status:In Press
Keywords:Sea-ice Permittivity, Reflectometry, Satellite Navigation Systems, MOSAiC Expedition
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
Deposited By: Semmling, Dr. Maximilian
Deposited On:02 Dec 2021 07:14
Last Modified:02 Dec 2021 07:14

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