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Description

This dataset provides daily-averaged model-simulated sea-ice and snow horizontal volume tendencies from the SASSIE ECCO Version 1 Release 1 (V1R1) ocean and sea-ice state estimate. ECCO (Estimating the Circulation and Climate of the Ocean) is a 4D ocean circulation model combining observations with a general circulation model (GCM) to estimate the complete time-evolving state of the global ocean. In this project, it was run over the Arctic polar region in support of the Salinity and Stratification at the Sea Ice Edge (SASSIE) field experiment - a NASA experiment focused on salinity anomalies in the upper ocean generated by melting sea ice. The SASSIE ECCO simulation was produced by downscaling the global ECCO state estimate from 1/3 to 1/12 degree grid cells, where the global solution provided initial and boundary conditions and atmospheric forcing. The output fields for this dataset cover the period 2014-01-15T12:00:00 to 2021-02-07T12:00:00 and are consolidated onto a single curvilinear grid face focusing on the Arctic domain, using the 5 faces of the lat-lon-cap 1080 (llc1080) native grid from the original simulation. Ocean density and pressure are provided at 90 depth levels from 0.5 meters to 6760 meters. Daily files are available in netCDF-4.
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This dataset is one of 22 produced by SASSIE ECCO - the full list can be found in the user guide. To cite all 22 datasets with a single DOI, please cite the user guide (citation details and DOI can be found within the user guide).

Version Description

Version 1, Release 1

Product Summary

Platforms
MITgcm
Location
ARCTIC
Coordinate System
GEODETIC
Granule Spatial Representation
GEODETIC
Temporal Extent
2014-01-15 to 2021-02-08
Temporal Resolution
1 Day
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC)
Concept ID
C3876033640-POCLOUD
Data State
COMPLETE
Number of Files/Granules
2581
Processing Level
4
Science Keywords
Sea Ice ,
Sea Ice

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

Marie Zahn, M. W. (2026). SASSIE ECCO Sea-Ice and Snow Horizontal Volume and Area Tendencies - Daily Mean llc1080 Grid (Version 1 Release 1) [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/SEL1D-ICH11 Date Accessed: 2026-01-29

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
i In the Arakawa C-grid system, tracer (e.g., THETA) and &#039;v&#039; variables (e.g., VVEL) have the same x coordinate on the model grid. N/A int N/A N/A 1
j In the Arakawa C-grid system, tracer (e.g., THETA) and &#039;u&#039; variables (e.g., UVEL) have the same y coordinate on the model grid. N/A int N/A N/A 1
SIdA Net rate of change of the sea ice covered fraction of a grid cell surface area from all contributing processes (thermodynamic + dynamic). s-1 float 9.96921E+36 -1.4122149877949E-5 to 4.1347716432938E-6 1
SIdAbATC Tendency of the sea ice covered fraction of a grid cell surface area due to atmospheric fluxes acting over the ice-covered fraction of the grid cell. s-1 float 9.96921E+36 -8.8872825765307E-11 0 1
SIdAbATO Tendency of the sea ice covered fraction of a grid cell surface area due to atmospheric fluxes acting over the open ocean fraction of the grid cell. s-1 float 9.96921E+36 -1.5272783926434E-8 to 4.1347716432938E-6 1
SIdAbOCN Tendency of the sea ice covered fraction of a grid cell surface area due to fluxes at the ice-ocean interface. s-1 float 9.96921E+36 -5.516970759345E-6 0 1
SIheffPT Grid-cell mean sea ice thickness (SIheff) prior to thermodynamic growth or melt calculations. m float 9.96921E+36 0 to 4.4050874710083 1
SIhsnoPT Grid-cell mean snow thickness (SIhsnow) prior to thermodynamic growth or melt calculations. m float 9.96921E+36 0 to 0.81472480297089 1
time midpoint time of averaging period hours since 1992-01-01T12:00:00 int N/A N/A 1
time_bnds Start and end times of averaging period. N/A int N/A N/A 1
XC nonuniform grid spacing degrees_east float N/A -179.9994354248 to 179.99996948242 1
XC_bnds Bounds array follows CF conventions. XC_bnds[i,j,0] = &#039;southwest&#039; corner (j-1, i-1), XC_bnds[i,j,1] = &#039;southeast&#039; corner (j-1, i+1), XC_bnds[i,j,2] = &#039;northeast&#039; corner (j+1, i+1), XC_bnds[i,j,3] = &#039;northwest&#039; corner (j+1, i-1). Note: &#039;southwest&#039;, &#039;southeast&#039;, northwest&#039;, and &#039;northeast&#039; do not correspond to geographic orientation but are used for convenience to describe the computational grid. See MITgcm documentation for details. N/A float N/A N/A 1
YC nonuniform grid spacing degrees_north float N/A 48.678619384766 to 89.978286743164 1
YC_bnds Bounds array follows CF conventions. YC_bnds[i,j,0] = &#039;southwest&#039; corner (j-1, i-1), YC_bnds[i,j,1] = &#039;southeast&#039; corner (j-1, i+1), YC_bnds[i,j,2] = &#039;northeast&#039; corner (j+1, i+1), YC_bnds[i,j,3] = &#039;northwest&#039; corner (j+1, i-1). Note: &#039;southwest&#039;, &#039;southeast&#039;, northwest&#039;, and &#039;northeast&#039; do not correspond to geographic orientation but are used for convenience to describe the computational grid. See MITgcm documentation for details. N/A float N/A N/A 1
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