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.

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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.