Abstract:

GISR Cruise G09 surveyed the region surrounding the site where an moored ADCP current profiler was deployed a few days prior by a related cruise (E/V Nautilus NA56). This is the hydrographic dataset containing CTD data from vertical profiles and laboratory-determined values of nutrients, dissolved oxygen, carbon-14 and salinity from water samples.

Suggested Citation:

DiMarco, Steven F.. 2016. Hydrographic and chemical measurements from the GISR: G09 Field Study cruise, south of the Mississippi River Delta over the continental slope and rise in the Greens Canyon 600 lease block in April 2015 from the R/V Pelican cruise 15PE21. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7Z60M3Z

Publications:

Chapman, P., DiMarco, S. F., Key, R. M., Previti, C., & Yvon-Lewis, S. (2017). Age Constraints on Gulf of Mexico Deep Water Ventilation as Determined by 14C Measurements. Radiocarbon, 1–16. doi:10.1017/rdc.2017.80

Purpose:

Ancillary data collected during the deployment of an upward looking bottom moored ADCP.

Data Parameters and Units:

The CTD parameters and units include: time : seconds since 1970-01-01 00:00:00 Longitude : degrees_east Latitude : degrees_north Pressure : dbar Temperature : deg C Conductivity : S/m Fluorescence : ug/l dissolved Oxygen : ml/l Beam_transmission : % sigma-T : kg/m^3 Altimeter : m Depth : m Descent Rate : m/s Potential Temperature: deg C Salinity : PSU Carbon-14 parameters and units include: Depth : m F Modern: unitless FM Err : unitless Age : years d13C : parts per thousand d14C : parts per thousand DIC : mmol/kg Winkler Dissolved Oxygen oxygen : ml/l and mg/l and mM/L Nutrients: NO3 (nitrate) : umol/L and mg/L HPO4 (phosphate) : umol/L and mg/L HSIO3 (silicate) : umol/L and mg/L NH4 (ammonium) : umol/L and mg/L NO2 (nitrite) : umol/L and mg/L Urea : umol/L and mg/L N03+NO2 (nitrate+nitrite) : umol/L and mg/L Salinity: unitless or PSU

Methods:

Lowered CTD, Water samples collected from Niskin bottles or buckets (surface samples).

Provenance and Historical References:

Meteorological and near-surface oceanographic observations from an underway system are available in another dataset (R1.x137.000:0005).

Individual Files: