Theory of Radar Polarimetric Interferometry and Its Application to the Retrieval of Sea Ice Elevation in the Western Weddell Sea, Antarctic. Issue 5 (29th April 2022)

• Record Type: Journal Article
• Authors: Nghiem, Son V.; Huang, Lanqing; Hajnsek, Irena
• Is Part Of: Earth and space science. Volume 9:Issue 5(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-29
• Subjects: Sea ice elevation -- radar polarimetric interferometry -- Maxwell's equations -- analytic method -- Weddell Sea -- Antarctic; Space sciences -- Periodicals; Geophysics -- Periodicals; 500.5
• DOI: 10.1029/2021EA002191
• Languages: English
• ISSNs: 2333-5084

Abstract

Abstract: Sea ice elevation plays a crucial role in sea ice dynamic processes driven by winds and waves, for which satellite radar remote sensing becomes indispensable to monitor snow‐covered sea ice across the vast polar regions regardless of darkness and clouds. To measure sea ice elevation, a theory of polarimetric interferometry for both monostatic and bistatic radars is developed based on analytic solutions of Maxwell's equations, accounting for realistic and complicated properties of snow, sea ice, and seawater. This analytic method inherently preserves phase information that is imperative for radar polarimetry and interferometry. Among a multitude of complex radar coefficients in the general polarimetric interferometric covariance matrix, the symmetry group theory is utilized to identify and select appropriate terms pertaining to the retrieval of sea ice elevation while avoiding radar parameters that may inadvertently introduce non‐uniqueness and excessive uncertainty. Theoretical calculations compare well with field observations for rough and old sea ice encountered in the Operation‐IceBridge and TanDEM‐X Antarctic Science Campaign over the Western Weddell Sea. The results show that the magnitude of the coefficient of normalized correlation between co‐polarized horizontal and co‐polarized vertical radar returns is inversely related to sea ice elevation, while the associate phase term is nonlinear and noisy and should be excluded. From these analyses, a protocol is set up to measure Antarctic sea ice elevation to be presented in the next companion paper. Plain Language Summary: To understand sea ice processes and advance models for sea ice motions require information on the height of sea ice above the seawater level. For this purpose, an advanced radar theory is developed and validated with measurements from an experiment conducted over Antarctic sea ice. Based on physical insights from the radar theory, a protocol is set up to retrieve the elevation of rough and old sea ice using data acquired by satellite radars for Earth observations. Key Points: A polarimetric interferometric radar theory is developed based on solutions of Maxwell's equations to calculate Antarctic sea ice elevation Theoretical and experimental results are well compared and show an inverse relation between a polarimetric radar term and sea ice elevation Based on physical insights from the theory, a protocol is set up to measure elevation of thick and deformed Antarctic sea ice by X band SAR