Summary: This dataset represents the pixel-by-pixel uncertainty corresponding to the daily 1 km seamless Antarctic sea ice albedo product (available at https://doi.org/10.5281/zenodo.11216156). For clear-sky pixels, the seasonal mean uncertainty was calculated using a Monte Carlo simulation approach and subsequently extended to daily resolution. For cloudy-sky albedo reconstruction (including interpolation, smoothing, and cloud radiative forcing correction), uncertainty was estimated by applying Gaussian error propagation. This dataset can be utilized to evaluate the performance of the Antarctic sea ice albedo product in terms of precision and reliability across varying atmospheric and surface conditions. Spatial resolution: 1 km Temporal resolution: daily (2012-2021) Format: GeoTIFF Projection: This dataset adopts Sinusoidal projection and is gridded using the MODIS Sinusoidal Tile Grid How to name and use data files: The dataset has a longitude range of 180°W to 180°E and a latitude range of 50°S to 80°S, covering 53 tiles (v14: h06~h29; v15: 09~h26; V16: h11~h17, h21~h24). The GeoTIFF file contains a band that represents the albedo uncertainty, with 16-bit integer values of 0-10000 and a scale factor of 0.0001. The ocean water and Antarctic continent are set to a filling value of -1. The file name is "Antarctic_Sea_Ice_Albedo_ Uncertainty_{yyyyddd}_ {hv}.tif ”, where yyyy represents year, ddd represents day of the year, and hv represents the number of the tile. For example, "Antarctic_Sea_Ice_Albedo_Uncertainty_2014270_h18v15.tif" represents the sea ice albedo data of the h18v15 area on the 270th day of 2014. Contacts: Weifeng Hao (haowf@whu.edu.cn), Chao Ma (macwhu@whu.edu.cn)