ECCO Geometry Parameters for the Lat-Lon-Cap 90 (llc90) Native Model Grid (Version 4 Release 4)

(ECCO_L4_GEOMETRY_LLC0090GRID_V4R4)

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Citation

Version	V4r4
Processing Level	4
Start/Stop Date	1992-Jan-01 to 2018-Jan-01
Short Name	ECCO_L4_GEOMETRY_LLC0090GRID_V4R4
Description	This dataset provides geometric parameters for the lat-lon-cap 90 (llc90) native model grid from the ECCO Version 4 Release 4 (V4r4) ocean and sea-ice state estimate. Parameters include areas and lengths of grid cell sides; horizontal and vertical coordinates of grid cell centers and corners; grid rotation angles; and global domain geometry including bathymetry and land/ocean masks. Estimating the Circulation and Climate of the Ocean (ECCO) state estimates are dynamically and kinematically-consistent reconstructions of the three-dimensional, time-evolving ocean, sea-ice, and surface atmospheric states. ECCO V4r4 is a free-running solution of a global, nominally 1-degree configuration of the MIT general circulation model (MITgcm) that has been fit to observations in a least-squares sense. Observational data constraints used in V4r4 include sea surface height (SSH) from satellite altimeters [ERS-1/2, TOPEX/Poseidon, GFO, ENVISAT, Jason-1,2,3, CryoSat-2, and SARAL/AltiKa]; sea surface temperature (SST) from satellite radiometers [AVHRR], sea surface salinity (SSS) from the Aquarius satellite radiometer/scatterometer, ocean bottom pressure (OBP) from the GRACE satellite gravimeter; sea ice concentration from satellite radiometers [SSM/I and SSMIS], and in-situ ocean temperature and salinity measured with conductivity-temperature-depth (CTD) sensors and expendable bathythermographs (XBTs) from several programs [e.g., WOCE, GO-SHIP, Argo, and others] and platforms [e.g., research vessels, gliders, moorings, ice-tethered profilers, and instrumented pinnipeds]. V4r4 covers the period 1992-01-01T12:00:00 to 2018-01-01T00:00:00.
DOI	10.5067/ECL5A-GRD44
Measurement	OCEANS > SEA ICE > SEA ICE CONCENTRATION
Platform/Sensor
Project	Estimating the Circulation and Climate of the Ocean (ECCO)
Data Provider	Publisher: PO.DAAC Creator: ECCO Consortium, Fukumori, I., Wang, O., Fenty, I., Forget, G., Heimbach, P., & Ponte, R. M. Release Place: PO.DAAC Release Date: 2021-Apr-19
Format	netCDF-4
Keyword(s)	ECCO, Estimating the Circulation and Climate of the Ocean, reconstruction, remote sensing, in situ, estimate, ocean, global, model, grid, geometry

Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov

Resolution Spatial Resolution: 1 Decimal Degrees x 1 Decimal Degrees Coverage North Bounding Coordinate: 90 degrees South Bounding Coordinate: -90 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 1992-Jan-01 to 2018-Jan-01 Projection Ellipsoid: WGS 84

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https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2013557893-POCLOUD/temporal
Search Granules
https://search.earthdata.nasa.gov/search/granules?p=C2013557893-POCLOUD
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Available for access in-region with AWS Cloud
Region
us-west-2
Bucket/Object Prefix: Protected buckets contain the data files for a given collection. Protected simply means users must log in to Earthdata Login before gaining access to contents within that S3 Bucket. Please use the S3Credential endpoint to gain an Earthdata login token for use in S3 Access. Public buckets, in contrast, house metadata such as checksums, imagery, and metadata files and the like. A user can access public buckets and these types of files without logging in to Earthdata Login. Most of the time, you'll want to access the protected bucket Information
podaac-ops-cumulus-protected/ECCO_L4_GEOMETRY_LLC0090GRID_V4R4/
podaac-ops-cumulus-public/ECCO_L4_GEOMETRY_LLC0090GRID_V4R4/
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Name	Long Name	Unit
CS	cosine of tracer grid cell orientation vs geographical north	1
Depth	model seafloor depth below ocean surface at rest	m
drC	distance between the centers of adjacent tracer grid cells in the 'z' direction	m
drF	distance between the upper and lower interfaces of the model grid cell	m
dxC	distance between centers of adjacent tracer grid cells in the 'x' direction	m
dxG	distance between 'southwest' and 'southeast' corners of the tracer grid cell	m
dyC	distance between centers of adjacent tracer grid cells in the 'y' direction	m
dyG	distance between 'southwest' and 'northwest' corners of the tracer grid cell	m
hFacC	vertical open fraction of tracer grid cell	1
hFacS	vertical open fraction of tracer grid cell 'south' face	1
hFacW	vertical open fraction of tracer grid cell 'west' face	1
i	grid index in x for variables at tracer and 'v' locations
i_g	grid index in x for variables at 'u' and 'g' locations
j	grid index in y for variables at tracer and 'u' locations
j_g	grid index in y for variables at 'v' and 'g' locations
k	grid index in z for tracer variables
k_l	grid index in z corresponding to the top face of tracer grid cells ('w' locations)
k_p1	grid index in z for variables at 'w' locations
k_u	grid index in z corresponding to the bottom face of tracer grid cells ('w' locations)
maskC	wet/dry boolean mask for tracer grid cell
maskS	wet/dry boolean mask for 'south' face of tracer grid cell
maskW	wet/dry boolean mask for 'west' face of tracer grid cell
PHrefC	reference ocean hydrostatic pressure at tracer grid cell center	m2 s-2
PHrefF	reference ocean hydrostatic pressure at tracer grid cell top/bottom interface	m2 s-2
rA	area of tracer grid cell	m2
rAs	area of 'u' grid cell	m2
rAw	area of 'v' grid cell	m2
rAz	area of vorticity 'g' grid cell	m2
SN	sine of tracer grid cell orientation vs geographical north	1
tile	lat-lon-cap tile index
XC	longitude of tracer grid cell center	degrees_east
XC_bnds	longitudes of tracer grid cell corners
XG	longitude of 'southwest' corner of tracer grid cell	degrees_east
YC	latitude of tracer grid cell center	degrees_north
YC_bnds	latitudes of tracer grid cell corners
YG	latitude of 'southwest' corner of tracer grid cell	degrees_north
Z	depth of tracer grid cell center	m
Z_bnds	depths of top and bottom faces of tracer grid cell
Zl	depth of top face of tracer grid cell	m
Zp1	depth of top/bottom face of tracer grid cell	m
Zu	depth of bottom face of tracer grid cell	m

SCIENCE DATA PRODUCT SOFTWARE DOCUMENTATION
https://github.com/ECCO-GROUP/ Software maintained by ECCO Consortium on GitHub.
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/web-misc/ecco/docs/v4r4_reproduction_howto.pdf Instructions for reproducing ECCO Version 4 Release 4
https://ecco-v4-python-tutorial.readthedocs.io/ Python Tutorials for ECCO Central Production Version 4 (ECCO V4)
ALGORITHM DOCUMENTATION
https://github.com/ECCO-GROUP/ECCO-v4-Configurations/tree/master/ECCOv4%20Release%204 ECCO Version 4 Release 4 model configuration maintained by the ECCO Consortium on GitHub
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/web-misc/ecco/docs/v4r4_synopsis.pdf Synopsis of ECCO Version 4 Release 4
https://dspace.mit.edu/handle/1721.1/110380 Synopsis of ECCO 'Central Estimate' global ocean and sea-ice state estimate, Version 4 Release 3
USER'S GUIDE
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/web-misc/ecco/docs/v4r4_user_guide.pdf ECCO Version 4 Release 4 User Guide
PRODUCT USAGE
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/web-misc/ecco/docs/v4r4_overview_plots.pdf Sample Plots -- gcmfaces analysis of ECCO V4, Release 4 (1992-2017)
DATA RECIPE
https://github.com/podaac/data-readers Generic data readers

Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.

Citation

ECCO Consortium, Fukumori, I., Wang, O., Fenty, I., Forget, G., Heimbach, P., & Ponte, R. M.. 2021. ECCO Geometry Parameters for the Lat-Lon-Cap 90 (llc90) Native Model Grid (Version 4 Release 4). Ver. V4r4. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/ECL5A-GRD44

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For more information see Data Citations and Acknowledgments.

Journal Reference

ECCO Consortium, Fukumori, I., Wang, O., Fenty, I., Forget, G., Heimbach, P., & Ponte, R. M.. 2021. Synopsis of the ECCO Central Production Global Ocean and Sea-Ice State Estimate (Version 4 Release 4)., Zenodo. https://doi.org/10.5281/zenodo.3765928

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COMPLETE

Short Name:

ECCO_L4_GEOMETRY_LLC0090GRID_V4R4

Collection Concept ID:

C2013557893-POCLOUD

Spatial Coverage:

N: 90°

S: -90°

E: 180°

W: -180°

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                        Simple: podaac-data-downloader -c ECCO_L4_GEOMETRY_LLC0090GRID_V4R4 -d ./data --start-date 1992-01-01T00:00:00Z --end-date 1992-01-08T00:00:00Z -e ""
Download by Spatial and Temporal Search: podaac-data-downloader -c ECCO_L4_GEOMETRY_LLC0090GRID_V4R4 -d ./data --start-date 1992-01-01T00:00:00Z --end-date 1992-01-08T00:00:00Z -b="-180,-90,180,90"
Download by Extension: podaac-data-downloader -c ECCO_L4_GEOMETRY_LLC0090GRID_V4R4 -d ./data --start-date 1992-01-01T00:00:00Z --end-date 1992-01-08T00:00:00Z -e .nc
Download recent data (360 min.): podaac-data-subscriber -c ECCO_L4_GEOMETRY_LLC0090GRID_V4R4 -d ./data -m 360
Download recent data (1440 min.): podaac-data-subscriber -c ECCO_L4_GEOMETRY_LLC0090GRID_V4R4 -d ./data -m 1440

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                        https://harmony.earthdata.nasa.gov/C2013557893-POCLOUD/ogc-api-coverages/1.0.0/collections/all/coverage/rangeset?format=application%2Fx-zarr

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Available for access in-region with AWS Cloud

Region:

us-west-2

Bucket/Object Prefix Protected buckets contain the data files for a given collection. Protected simply means users must log in to Earthdata Login before gaining access to contents within that S3 Bucket. Please use the S3Credential endpoint to gain an Earthdata login token for use in S3 Access.

Public buckets, in contrast, house metadata such as checksums, imagery, and metadata files and the like. A user can access public buckets and these types of files without logging in to Earthdata Login.

Most of the time, you'll want to access the protected bucket Information

podaac-ops-cumulus-protected/ECCO_L4_GEOMETRY_LLC0090GRID_V4R4/

podaac-ops-cumulus-public/ECCO_L4_GEOMETRY_LLC0090GRID_V4R4/

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SYSTEM ALERT: NASA's Common Metadata Repository (CMR) Search Integrity encountered a service degradation, resulting in an outage from May 12 to May 14, 2025, which caused a downstream impact on PO.DAAC Data Holdings. CMR is currently operating without any known issues.

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ECCO Geometry Parameters for the Lat-Lon-Cap 90 (llc90) Native Model Grid (Version 4 Release 4)

ECCO Geometry Parameters for the Lat-Lon-Cap 90 (llc90) Native Model Grid (Version 4 Release 4)

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ECCO Geometry Parameters for the Lat-Lon-Cap 90 (llc90) Native Model Grid (Version 4 Release 4)

ECCO Geometry Parameters for the Lat-Lon-Cap 90 (llc90) Native Model Grid (Version 4 Release 4)

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