West Atlantic Pre-SWOT Level-4 Hourly MITgcm LLC4320 Native Grid 2km Oceanographic Dataset Version 1.0

This dataset provides a regional multivariate oceanographic state estimate from a global ocean numerical simulation with a focus on the West Atlantic region. The global ocean simulation is based on the MIT general circulation model (MITgcm) with Lat-Lon-Cap grid (LLC) layout and 1/48-degree (2km at equator) nominal horizontal resolution. This simulation is often referred to as LLC4320 in the community and existing publications. The simulation has 90 vertical levels, with about 1-m vertical resolution at the surface and 30 m down to 500 m, for optimized resolution of the upper-ocean processes. The model has zero parameterized horizontal diffusivity. In the vertical direction, the K-Profile Parameterization (KPP) is used for boundary layer turbulent mixing. It is spun up progressively from the lower resolution MITgcm simulation from the Estimating the Circulation & Climate of the Ocean (ECCO), and forced by the 6-hourly ERA-Interim atmosphere reanalysis ( https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/era-interim ). A synthetic surface pressure field consisting of the 16 most dominant tidal constituents is used to dynamically mimic the tidal forcing. The dataset provides hourly oceanographic variables at native grid. Three-dimensional variables include temperature, salinity, and velocity. Two-dimensional variables include sea level anomaly, ocean mixed layer thickness, bottom pressure anomaly, net freshwater flux, net heat flux, shortwave radiative flux, net salt flux, and ocean surface stress.

Data and Resources

Additional Info

Field Value
Maintainer Earthdata Forum
Last Updated March 31, 2026, 00:26 (UTC)
Created April 1, 2025, 20:02 (UTC)
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id 87096ddc-3f2c-48d0-96b7-38ed4ef1566c
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
identifier 10.5067/PRESW-WAJ10
license https://www.usa.gov/government-works
modified 2026-03-23T22:16:04Z
programCode {026:000}
publisher NASA/JPL/PODAAC
resource-type Dataset
source_datajson_identifier true
source_hash ba109814a368e7bf99c7ddc22610c929d31490067d99072d38e33fa4f619e62b
source_schema_version 1.1
spatial ["CARTESIAN",[{"NorthBoundingCoordinate":38.7,"WestBoundingCoordinate":-76.5,"EastBoundingCoordinate":-72.0,"SouthBoundingCoordinate":32.7}]], Maximum Depth;Minimum Depth, 6134.5;0
temporal 2011-09-13/2012-11-15
theme {"Earth Science"}