N: 42 S: 20 E: -28 W: -73
Description
The SPURS (Salinity Processes in the Upper Ocean Regional Study) project is an oceanographic process study and associated field program that aim to elucidate key mechanisms responsible for near-surface salinity variations in the oceans. The project involves two field campaigns and a series of cruises in regions of the Atlantic and Pacific Oceans exhibiting salinity extremes. SPURS employs a suite of state-of-the-art in-situ sampling technologies that, combined with remotely sensed salinity fields from the Aquarius/SAC-D and SMOS satellites, provide a detailed characterization of salinity structure over a continuum of spatio-temporal scales. The SPURS-1 campaign involved a series of 5 cruises during 2012 - 2013 seeking to characterize the salinity structure and balance in a high salinity, high evaporation, and low rainfall region of the subtropical North Atlantic. It aims to resolve processes responsible for maintaining the subtropical surface salinity maximum in this region and within a 900 x 800-mile square study area centered at 25N, 38W. Acoustic Doppler Current Profilers (ADCP) provide water column current velocity profile observations. Shipborne ADCP data were collected during the 3 US cruises, using the Knorr and Endeavor 300 kHz Workhorse, 75 khz broadband and 75 khz narrowband instruments, and during the Sarmiento cruise using a 76.8 khz broadband ADCP. Corresponding ruise dates were as follows: Knorr: 6 Sept-9 Oct 2012; Sarmiento: 14 Mar-10 Apr 2013, Endeavor: 15 Mar-15 Apr 2013 and 19 Sep-13 Oct 2013. Additionally, lowered ADCP (L-ADCP) measurements were made during the Knorr cruise on every CTD cast and during the Sarmiento cruise. The ADCP data files here (1 per cruise) are for the shipborne ADCP measurements only.
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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 |
|---|---|---|---|---|---|---|---|
| amp | Received signal strength of ADCP measurement | none | float | 1.0E+30 | 16 to 210 | 1 | N/A |
| lat | Latitude of ADCP measurement | degrees_north | float | N/A | 22 to 42 | 1 | N/A |
| lon | Longitude of ADCP measurement | degrees_east | float | N/A | -73 to -36 | 1 | N/A |
| pg | Percent of good pings of ADCP measurement | none | float | 1.0E+30 | 0 to 100 | 1 | N/A |
| ship_direction | Direction of ship during ADCP measurement | degrees | float | 1.0E+30 | -180 to 180 | 1 | N/A |
| temperature | Temperature of ADCP transducer measurement | degrees_C | float | 1.0E+30 | 3 to 25 | 1 | N/A |
| time | Time of ADCP measurement | seconds since 1970-01-01 00:00:00 0:00 | double | N/A | N/A | 1 | N/A |
| trajectory | Unique identifier for each feature instance | N/A | float | N/A | N/A | 1 | N/A |
| u | Zonal velocity component of ADCP measurement | m/s | float | 1.0E+30 | -1 to 3 | 1 | N/A |
| u_ship | Ship zonal velocity component during ADCP measurement | m/s | float | 1.0E+30 | -6 to 6 | 1 | N/A |
| v | Meridional velocity component of ADCP measurement | m/s | float | 1.0E+30 | -2 to 2 | 1 | N/A |
| v_ship | Ship meridional velocity component during ADCP measurement | m/s | float | 1.0E+30 | -6 to 6 | 1 | N/A |
| z | Depth of ADCP measurement | m | float | N/A | 22 to 655 | 1 | N/A |