Sea Ice Elevation in the Western Weddell Sea, Antarctica: Observations From Field Campaign

• Published in: Earth and Space Science
• Main Authors: Huang, Lanqing, Hajnsek, Irena, Nghiem, Son V.
• Format: Other Non-Article Part of Journal/Newspaper
• Language: English
• Published: American Geophysical Union (AGU) 2022
• Subjects: Radarkonzepte; Antarctic; The Antarctic; Weddell Sea; Weddell; Antarc*; Antarctica; Sea ice
• Online Access: https://elib.dlr.de/188599/; https://elib.dlr.de/188599/1/Earth%20and%20Space%20Science%20-%202022%20-%20Huang%20-%20Sea%20Ice%20Elevation%20in%20the%20Western%20Weddell%20Sea%20Antarctica%20Observations%20From%20Field.pdf; https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2022EA002472

Sea ice elevation is crucial in the characterization of three-dimensional (3D) sea ice patterns, providing physical insights to advance sea ice dynamic models. Moreover, how sea ice elevation may be related to the ocean geophysical environment is still a significant knowledge gap, especially in Antarctica. A radar theory relating electromagnetic scattering mechanisms to sea ice elevation over old and deformed rough ice has been reported in a prior companion paper. This follow-up paper presents the validated model function and synthetic aperture radar (SAR)-retrieved sea ice elevations based on the field data acquired during the Operation IceBridge and TanDEM-X Antarctic Science Campaign. A high-resolution sea ice digital elevation model (DEM) is generated extensively over a 19 × 450 km sector in the Western Weddell Sea, achieving a good accuracy with a low root-mean-square error of 0.23 m. From the SAR-retrieved sea ice DEM, 3D sea ice patterns including roughness height, auto-correlation lengths, correlation ellipticity, and orientation angles are calculated over the old and deformed rough sea ice. The 3D sea ice patterns give a comprehensive characterization of sea ice topography in the Western Weddell Sea and show the potential to be used for understanding sea ice formation processes in the Antarctic.