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Description

This data set contains daily and monthly gridded polar sea surface height (SSH) anomalies, derived from the along-track ATLAS/ICESat-2 L3A Sea Ice Height product (ATL10, V5). The ATL10 product identifies leads in sea ice and establishes a reference sea surface used to estimate SSH in 10 km along-track segments. ATL21 aggregates the ATL10 along-track SSH estimates and computes daily and monthly gridded SSH anomaly in NSIDC Polar Stereographic Northern and Southern Hemisphere 25 km grids.

Version Description

There were no changes in the ATL20 algorithm for this version. The changes in this version stem from the changes in the underlying ATL10, V5 data. See the corresponding ATL10 landing page for details.

Product Summary

Platforms
ICESat-2
Instruments
ATLAS
Spatial Extent

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

Spatial Resolution
25 Kilometers x 25 Kilometers
Spatial Reference System(s)
Multiple EPSG codes (see User Guide)
Location
GLOBAL OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2018-10-14 to 2022-09-30
Temporal Resolution
Varies
Concept ID
C2153577500-NSIDC_CPRD
Data State
DEPRECATED
Number of Files/Granules
0
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. (2021). ATLAS/ICESat-2 L3B Daily and Monthly Gridded Polar Sea Surface Height Anomaly, Version 2 [Dataset]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ATLAS/ATL21.002 Date Accessed: 2026-09-10

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