Estimation of Arctic Sea Ice Thickness from Chinese HY-2B Radar Altimetry Data

Sea ice thickness (SIT) is an important parameter in the study of climate change. During past 20 years, satellite altimetry has been widely used to observe sea thickness. The Chinese Haiyang-2B (HY-2B) radar altimeter, launched October 2018, can provide data up 80.6° latitude and be as a supplementary means polar ice. Reliable HY-2B SIT products will contribute community. In this study, we aimed assess Arctic retrieval ability data. We processed from January 2019 April 2022 retrieve SIT. Alfred Wegener Institute (AWI) CryoSat-2 (CS-2) were calibrate estimates with linear regression method. Goddard Space Flight Center (GSFC) CS-2, Jet Propulsion Laboratory (JPL), GSFC ICESat-2 (IS-2) validate calibrated estimates. have good, consistent spatial distributions CS-2 IS-2 products. comparison shows root-mean-square error (RMSE) bias for are significantly reduced after calibration. also validated using Operation IceBridge (OIB) draft Beaufort Gyre Exploration Project (BGEP). Finally, monthly variations analyzed. Results show that reliable, especially when values lower than 3 m. possible source at latitudes help us better understand response