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Description

ATL21 contains daily and monthly gridded polar sea surface height anomalies, derived from ATLAS/ICESat-2 L3A Sea Ice Freeboard (ATL10) along-track freeboard estimates.

Version Description

Updated the attribute grid mapping and CRS variable to improve NetCDF compliance.

Product Summary

Platforms
ICESat-2
Instruments
ATLAS
Spatial Extent

N: 89 S: 37 E: 180 W: -180

,

N: -53 S: -79 E: 180 W: -180

Spatial Resolution
25 Kilometers x 25 Kilometers
Geographic Region
POLAR
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2018-10-14 to Present
Concept ID
C3826284331-NSIDC_CPRD
Data State
ACTIVE
Number of Files/Granules
166
Processing Level
3
Published
Science Keywords
Sea Surface Height Anomaly (SSHA)

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., Kurtz, N., Wimert, J., Lee, J., & Hancock, D. (2025). ATLAS/ICESat-2 L3B Daily and Monthly Gridded Polar Sea Surface Height Anomaly, Version 4 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ATLAS/ATL21.004 Date Accessed: 2026-01-08

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