Abstract:

Conductivity, temperature, and depth data from the ship's CTD, which was deployed at each of the DEEPEND stations. Depth of cast is variable, but extends from near-surface waters to below the euphotic zone. These data are used in the assessment of the water column's vertical structure, and for comparison with physical models. Data were collected during cruise DP03 (R/V Point Sur cruise PS1622, cruise doi: https://doi.org/10.7284/909386) in the northern Gulf of Mexico, 2016-05-01 - 2016-05-13.

Suggested Citation:

English, D., Hu, C., Cook, A., Sutton, T.. 2018. Conductivity, temperature and depth (CTD) data for DEEPEND stations, cruise DP03 (R/V Point Sur cruse PS1622), 2016-05-01 -2016-05-13. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7R49P43

Publications:

Johnston, M. W., Milligan, R. J., Easson, C. G., deRada, S., English, D. C., Penta, B., & Sutton, T. T. (2019). An empirically validated method for characterizing pelagic habitats in the Gulf of Mexico using ocean model data. Limnology and Oceanography: Methods. doi:10.1002/lom3.10319

Purpose:

To assess the water column's vertical structure.

Data Parameters and Units:

Raw files: Pressure (db), Temperature (ITS-90, deg C), Temperature (ITS-90, deg C), Conductivity (S/m), Oxygen SBE 43 (mL/L), Fluorescence WET Labs ECO-AFL/FL (mg/m^3), Beam attenuation WET Labs C-Star (1/m), Potential temperature (ITS-90, deg C), Salinity (psu), Oxygen saturation (Weiss, mL/L), Depth (m), Sound velocity (Chen-Millero, m/s), Density (sigma-t, kg/m^3) Binned files: Cruise ID, Castname, Latitude (decimal degrees), Longitude (decimal degrees), Mean downcast time (MM/DD/YYYY HH:MM), Downcast start (MM/DD/YYYY HH:MM), Downcast end (MM/DD/YYYY HH:MM), Maximum cast depth (m), Depth bin (m), Depth (m), Temperature (deg C), Salinity (psu), Sigma t (kg/m^3), Chlorophyll fluorescence (mg/m^3), Beam attenuation (1/m), Fluorescence Aquatracker (1/m), Dissolved oxygen (mL/L), Oxygen saturation (% saturation), Absolute salinity (g/kg), Conservative temperature (deg C)

Methods:

In addition to the raw CTD data, 1 meter depth binned data is available for each CTD cast. The chlorophyll and CDOM fluorescence values have been converted using a regression to discrete water sample measurements made during the cruise. Here, the in-situ fluorometry units for the chlorophyll_a concentrations units are mg/m^3, and the CDOM units are absorption of 400nm light (1/m).

Instruments:

Seabird SBE 911+/917+ CTD, WetlabECO_AFL_FL fluorometer, ChelseaUV_AquaSensor fluorometer,

Individual Files: