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Modelling and Estimation of Sea-Ice Reflectivity: MOSAiC Results on GNSS Reflectometry

Semmling, Maximilian and Wickert, Jens and Hoque, Mohammed Mainul and Divine, Dmitry and Gerland, Sebastian and Spreen, Gunnar (2023) Modelling and Estimation of Sea-Ice Reflectivity: MOSAiC Results on GNSS Reflectometry. 2nd MOSAiC Science Conference, 2023-02-13 - 2023-02-17, University of Colorado, Boulder, Colorado, USA.

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Abstract

The L-band signals transmitted by Global Navigation Satellite Systems (GNSS) are a promising source for sea-ice remote sensing as they partly penetrate into ice upon reflection. Reflecting interfaces of sea-ice layer and snow cover contribute to the reflected signal. We present calculations of sea-ice reflectivity for GNSS signals based on a multilayer reflection model. Therefore, we assume coherent reflection conditions, satellite elevation angles of 3° to 30° and layers of the different media (with their relative permittivity): dry snow cover (~1), low/high-salinity ice layer (~3/~5) and underlying sea water (~70). Furthermore, we analyze reflectivity profiles estimated from GNSS reflectometry data of the first MOSAiC drift period (10/2019 to 06/2020) in the central Arctic. The comparison of model and estimation results shows that oscillation patterns occur when low permittivity coincides with low conductivity (low-salinity ice or dry snow). The patterns are particularly strong in late April 2020 after three days of warm air intrusion at the ice floe. We conclude that structural changes of the sea-ice/snow layers upon temperature change can be detected by reflectometry measurements. Upcoming satellites (e.g. ESA's nano-satellite PRETTY) will provide further opportunities to study reflectometry data over sea ice in the Arctic and Antarctic.

Item URL in elib:https://elib.dlr.de/194397/
Document Type:Conference or Workshop Item (Poster)
Title:Modelling and Estimation of Sea-Ice Reflectivity: MOSAiC Results on GNSS Reflectometry
Authors:
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
Divine, DmitryUNSPECIFIEDhttps://orcid.org/0000-0003-0548-6698UNSPECIFIED
Gerland, SebastianNorwegian Polar Institute, Fram Centre, Tromsø, Norwayhttps://orcid.org/0000-0002-2295-9867UNSPECIFIED
Spreen, GunnarInstitute of Environmental Physics, University of Bremen, Bremen, Germanyhttps://orcid.org/0000-0003-0165-8448UNSPECIFIED
Date:2023
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:GNSS reflectometry, MOSAiC, sea ice
Event Title:2nd MOSAiC Science Conference
Event Location:University of Colorado, Boulder, Colorado, USA
Event Type:international Conference
Event Start Date:13 February 2023
Event End Date:17 February 2023
Organizer:https://mosaic.colorado.edu/second-science-conference
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:23 Mar 2023 07:41
Last Modified:24 Apr 2024 20:55

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