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
Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.
The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.
| Name Sort descending | Description | Units | Data Type | Fill Value | Valid Range | Scale Factor |
|---|---|---|---|---|---|---|
| amp | Received signal strength of ADCP measurement | none | float | 1.0E+30 | 16 to 210 | 1 |
| lat | Latitude of ADCP measurement | degrees_north | float | N/A | 22 to 42 | 1 |
| lon | Longitude of ADCP measurement | degrees_east | float | N/A | -73 to -36 | 1 |
| pg | Percent of good pings of ADCP measurement | none | float | 1.0E+30 | 0 to 100 | 1 |
| ship_direction | Direction of ship during ADCP measurement | degrees | float | 1.0E+30 | -180 to 180 | 1 |
| temperature | Temperature of ADCP transducer measurement | degrees_C | float | 1.0E+30 | 3 to 25 | 1 |
| time | Time of ADCP measurement | seconds since 1970-01-01 00:00:00 0:00 | double | N/A | N/A | 1 |
| trajectory | Unique identifier for each feature instance | N/A | float | N/A | N/A | 1 |
| u | Zonal velocity component of ADCP measurement | m/s | float | 1.0E+30 | -1 to 3 | 1 |
| u_ship | Ship zonal velocity component during ADCP measurement | m/s | float | 1.0E+30 | -6 to 6 | 1 |
| v | Meridional velocity component of ADCP measurement | m/s | float | 1.0E+30 | -2 to 2 | 1 |
| v_ship | Ship meridional velocity component during ADCP measurement | m/s | float | 1.0E+30 | -6 to 6 | 1 |
| z | Depth of ADCP measurement | m | float | N/A | 22 to 655 | 1 |