N: 38.1 S: 36.3 E: -122.9 W: -125.4
Description
This dataset contains shipboard Acoustic Doppler Current Profiler (ADCP) measurements from the Sub-Mesoscale Ocean Dynamics Experiment (S-MODE) during a pilot campaign and two intensive operating periods (IOPs) conducted approximately 300 km offshore of San Francisco during Fall 2021, 2022, and Spring 2023. S-MODE aims to understand how ocean dynamics acting on short spatial scales influence the vertical exchange of physical and biological variables in the ocean. The ADCP was mounted to the bottom of the hulls of the research vessels deployed during each campaign, measuring horizontal and vertical currents, as well as acoustic backscatter from approximately 3 m to 50 m depth along the ship’s track. The data are available in netCDF format with dimensions of time and depth.
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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 | Offset |
|---|---|---|---|---|---|---|---|
| depth | Depth of Shipboard ADCP Measurement and Bin Center | m | double | N/A | N/A | 1 | N/A |
| editing_flag | Profile Flags based on editing, used to mask u, v. | N/A | double | N/A | N/A | 1 | N/A |
| latitude | Latitude of Shipboard ADCP Measurement | degrees_north | double | N/A | N/A | 1 | N/A |
| longitude | Longitude of Shipboard ADCP Measurement | degrees_east | double | N/A | N/A | 1 | N/A |
| meridional_velocity | Sea Water Meridional Velocity | m s-1 | double | -9999 | -5 to 5 | 1 | N/A |
| number_of_pings | Number of Pings Averaged per Ensemble | 1 | double | N/A | 0 to 300 | 1 | N/A |
| percent_good_pings | Percent Good pings for u, v averaging after editing. | percent | double | -9999 | 0 to 100 | 1 | N/A |
| ship_heading | Mean ship heading during the ensemble | degrees | double | -9999 | 0 to 360 | 1 | N/A |
| ship_meridional_velocity | Ship Meridional Velocity | m s-1 | double | -9999 | -10 to 10 | 1 | N/A |
| ship_zonal_velocity | Ship Zonal Velocity | m s-1 | double | -9999 | -10 to 10 | 1 | N/A |
| signal_strength | Received signal strength in ADCP-specific units; no correction for spreading or attenuation. | amp | double | -9999 | 0 to 200 | 1 | N/A |
| time | Time Shipboard ADCP Measurement | days since 1950-01-01 | double | N/A | N/A | 1 | N/A |
| trajectory | Trajectory ID: hash based on cruise ID, instrument, and ping type | N/A | double | N/A | N/A | 1 | N/A |
| transducer_temperature | Temperature of Transducer | degrees_c | double | -9999 | 0 to 20 | 1 | N/A |
| zonal_velocity | Sea Water Zonal Velocity | m s-1 | double | -9999 | -5 to 5 | 1 | N/A |