Daily Sea Ice Concentration Product over Polar Regions Based on Brightness Temperature Data from the HY-2B SMR Sensor

Polar sea ice profoundly affects atmospheric and oceanic circulation plays a significant role in climate change. Sea concentration (SIC) is key geophysical parameter used to quantify these changes. In this study, we determined SIC products for the Arctic Antarctic from 2019 2021 using data Chinese marine satellite Haiyang 2B (HY-2B) with an improved bootstrap algorithm. Then results were compared similar operational ship-based data. Our findings demonstrate effectiveness of algorithm accurately determining polar regions. Additionally, study that product obtained through has high correlation other products. The daily average different showed inter-annual trends both Comparison BT-SMR was slightly lower than BT-SSMIS BT-AMSR2 products, while difference between more pronounced. lowest MAE regions, largest NT-SMR Arctic, NT-SSMIS Antarctic. SIE SIA time series consistent trends, greater slight Arctic. Evaluation observation approximately 0.85 0.88 dynamic tie-points better reflected seasonal variation radiation characteristics. This lays foundation release long-term autonomous HY-2B satellite, which will ensure continuity records over past 40 years despite potential interruptions.