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

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

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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.

Item URL in elib:https://elib.dlr.de/193355/
Document Type:Conference or Workshop Item (Speech)
Title:Sea-Ice Reflectivity Modelling and Estimation: Results on GNSS Reflectometry from Expeditions to the Arctic
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Semmling, MaximilianUNSPECIFIEDhttps://orcid.org/0000-0002-5228-8072UNSPECIFIED
Wickert, JensGeoForschungsZentrum Potsdamhttps://orcid.org/0000-0002-7379-5276UNSPECIFIED
Hoque, Mohammed MainulUNSPECIFIEDhttps://orcid.org/0000-0001-5134-4901UNSPECIFIED
Gerland, SebastianNorwegian Polar Institute, Fram Centre, Tromsø, Norwayhttps://orcid.org/0000-0002-2295-9867UNSPECIFIED
Spreen, GunnarUniversity of Bremen, IUP, Germanyhttps://orcid.org/0000-0003-0165-8448UNSPECIFIED
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:GNSS reflectometry, Arctic Ocean, Sea-ice
Event Title:11th ESA-NRSCC GNSS-R Workshop
Event Location:Virtual
Event Type:Workshop
Event Dates:26.-28.Oktober 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Solar-Terrestrial Physics SO
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Space Weather Observation
Deposited By: Semmling, Dr. Maximilian
Deposited On:23 Mar 2023 07:40
Last Modified:23 Mar 2023 07:40

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