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Description

ATL20 contains daily and monthly gridded estimates of sea ice freeboard, derived from along-track freeboard estimates in the ATLAS/ICESat-2 L3A Sea Ice Freeboard product (ATL10). Data are gridded at 25 km using the SSM/I Polar Stereographic Projection.

Version Description

-Correct reported longitude values to agree with NSIDC Polar Stereographic projections
-Added grid_mapping attribute to land_mask_map array
-Updated the mean sea surface (MSS) variable description; added mentions of the source of the MSS (which uses CryoSat-2 data) and clarified the use of the tide-free system

Product Summary

Platforms
ICESat-2
Instruments
ATLAS
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Spatial Resolution
25 Kilometers x 25 Kilometers
Geographic Region
GLOBAL OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2018-10-14 to 2025-02-28
Concept ID
C2753295020-NSIDC_CPRD
Data State
COMPLETE
Number of Files/Granules
154
Processing Level
3
Published
Science Keywords
Freeboard

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Petty, A., Kwok, R., Bagnardi, M., Ivanoff, A., Kurtz, N., Lee, J., Wimert, J., & Hancock, D. (2023). ATLAS/ICESat-2 L3B Daily and Monthly Gridded Sea Ice Freeboard, Version 4 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ATLAS/ATL20.004 Date Accessed: 2026-01-08

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