New data set release: ATLAS/ICESat-2 L3B Daily and Monthly Gridded Polar Sea Surface Height Anomaly, Version 1 (ATL21)

The ATLAS/ICESat-2 L3B Daily and Monthly Gridded Polar Sea Surface Height Anomaly, Version 1 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains daily and monthly gridded polar sea surface height (SSH) anomaly, derived from the along-track ATLAS/ICESat-2 L3A Sea Ice Height product (ATL10, V4). 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.  Spatial coverage includes regions in the ice-covered oceans of the Northern and Southern Hemispheres that have > 50% sea ice concentration and lie > 25 km away from the coast. Temporal coverage is from 1 November 2018 to present.

Access to the data and documentation is provided on the data set web page at the NSIDC DAAC:

Data Acknowledgements
Data authors: Petty, A. A., R. Kwok, M. Bagnardi, N. Kurtz, J. Wimert, J. Lee, and D. Hancock
Data set DOI:
Data center: NSIDC DAAC (
Sponsor: NASA EOSDIS (

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For further details about the ICESat-2 mission and data sets, please visit the ICESat-2 mission web page at the NSIDC DAAC:

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