ATLAS/ICESat-2 L3A Sea Ice Height, Version 3
The data set (ATL07) contains along-track heights for sea ice and open water leads (at varying length scales) relative to the WGS84 ellipsoid (ITRF2014 reference frame) after adjustment for geoidal and tidal variations, and inverted barometer effects. Height statistics and apparent reflectance are also provided. The data were acquired by the Advanced Topographic Laser Altimeter System (ATLAS) instrument on board the Ice, Cloud and land Elevation Satellite-2 (ICESat-2) observatory.
This is the most recent version of these data.
Changes for this version include:
- Added additional sea ice browse images to allow for better qualitative assessment of the product.
- Fixed a bug related to temporal/geographic bounds that placed ATL07 granules in the wrong hemisphere on Earthdata Search.
- Sea ice processing now limited to medium and high confidence photons when determining if a photon return is specular. This addresses overlap in the land ice and sea ice masks and issues with over-counting photons prior to calculating specular returns.
- The Version 3 algorithm was updated to account for the additional photons in the larger land ice telemetry window in regions where the land and sea ice masks overlap. This improves coverage around coastal Antarctica and the Arctic coast—in particular around Arctic shelves and Canadian Arctic Archipelago passages.
- Removed TEP photons from consideration for sea ice processing.
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As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.
Kwok, R., G. Cunningham, T. Markus, D. Hancock, J. H. Morison, S. P. Palm, S. L. Farrell, A. Ivanoff, J. Wimert, and the ICESat-2 Science Team. 2020. ATLAS/ICESat-2 L3A Sea Ice Height, Version 3. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/ATLAS/ATL07.003. [Date Accessed].