N: 90 S: -90 E: 180 W: -180
Description
This dataset leverages OSCAR (Ocean Surface Current Analyses Real-time) to produce Lagrangian products (namely Finite-Time Lyapunov Exponent and Dilation Rate) at multiple spatio-temporal resolutions, ranging from 1 day / 9 km to a 10-year climatological average at 500 km resolution. OSCAR is a global surface current database and NASA funded research project. OSCAR ocean mixed layer velocities are calculated from satellite-sensed sea surface height gradients, ocean vector winds, and sea surface temperature gradients using a simplified physical model for geostrophy, Ekman, and thermal wind dynamics. Daily averaged surface currents are provided on a global 0.25 x 0.25 degree grid as an average over an assumed well-mixed top 30 m of the ocean.
Product Summary
Citation
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Variables
The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.
| Name Sort descending | Description | Units | Data Type | Fill Value | Valid Range | Scale Factor |
|---|---|---|---|---|---|---|
| Delta | 3-Day Backward Dilation Rate for absolute time span | 1/day | float32 | -999 | -10 to 10 | N/A |
| ftle | 3-Day Backward Finite Time Lyapunov Exponent for absolute time span | 1/day | float32 | -999 | -10 to 10 | N/A |
| latitude | Latitude | degrees_north | float64 | N/A | -90 to 90 | N/A |
| longitude | Longitude | degrees_east | float64 | N/A | -180 to 180 | N/A |
| time | Time | seconds since 1970-01-01 00:00:00 | int32 | N/A | N/A | N/A |