Sea ice age and thickness in the Arctic

1. File: iceage_thick_YYMMDD.txt (arcticdata.zip) Description: Daily sea ice age and thickness data for the entire Northern Hemisphere. The data were derived from the thermodynamic history of sea ice, estimated using satellite microwave radiometer observations (AMSR-E / AMSR2). See Kimura and Hasumi (submitted:https://egusphere.copernicus.org/preprints/2025/egusphere-2025-3286/) for details of the calculation method. Grid: Polar stereographic projection, 900 × 900 grid points at 10 km resolution. File naming: YYMMDD in the filename indicates the year, month, and day. Format: Plain text file with 900 × 900 lines. Each line contains: latitude (N), longitude (E), oldest sea ice age (days), mean sea ice age (days), sea ice thickness (m) Coverage: 365 daily files for the year 2021. --- 2. File: iceage_thick_wh*.txt (beaufortdata.zip) Description: Time series of sea ice thickness at mooring sites A (75°N, 150°W), B (78°N, 150°W), and D (74°N, 140°W) of the Beaufort Gyre Exploration Project (https://www2.whoi.edu/site/beaufortgyre/). Sea ice thickness was estimated following the method of Kimura and Hasumi (submitted). File naming: * is replaced by a, b, or d, corresponding to mooring sites A, B, and D respectively. Format: Plain text file with 2,435 lines (one per day). Each line contains: year, month, day, sea ice thickness (m), mean sea ice age (days) Coverage: 31 July 2016 to 31 March 2023.