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Description

This data set contains monthly gridded dynamic ocean topography (DOT), derived from along-track ATLAS/ICESat-2 L3A Ocean Surface Height product (ATL12). Monthly gridded sea surface height (SSH) can be calculated by adding the mean DOT and the weighted average geoid height also provided in this data set. Both single beam and all-beam gridded averages are available in this data set. Single beam averages are useful to identify biases among the beams and the all-beam averages are advised to use for physical oceanography.

Version Description

Major changes for Version 3 include:

-Removed the effects of sea state bias from DOT
-Updated the prerequisites for calculating bin center values to require a minimum of four ocean segments and two orbits in the cell and the surrounding eight cells
-Updated the calculation of ssb_avgcntr and ssb_dfwcntr
-Used ANC50 for land-masking and added landmask to each region folder
-Updated processing to use only the ATL12 data that have times included in the time range requested in the control file
-Implemented along-track pre-grid filtering by latitude bands
-Corrected dot_hist_albm to be aggregate probability functions of DOT
-Populated parameter ice_conc_albm in the top groups and ice_conc in the beam sub-groups
-Added grid data for podppd_flag_prcnt and podppd_flag_prcnt_albm
-Added an override flag (podppd_edit) to /ancillary_data/ocean/

Product Summary

Platforms
ICESat-2
Instruments
ATLAS
Spatial Extent

N: 88 S: -88 E: 180 W: -180

Spatial Resolution
25 Kilometers x 25 Kilometers
Geographic Region
GLOBAL OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2018-10-13 to 2025-03-01
Concept ID
C2754956786-NSIDC_CPRD
Data State
COMPLETE
Number of Files/Granules
77
Processing Level
3
Published
Science Keywords
Sea Surface Height

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

Morison, J., Hancock, D., Dickinson, S., Robbins, J., & Roberts, L. (2023). ATLAS/ICESat-2 L3B Monthly Gridded Dynamic Ocean Topography, Version 3 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/ATLAS/ATL19.003 Date Accessed: 2026-01-09

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