Abstract:

Water column hydrographic data were collected during an August 2016 survey led by LUMCON (Louisiana Universities Marine Consortium) scientists. The dataset includes coordinates, pressure (depth), temperature, salinity, dissolved oxygen, total dissolved inorganic carbon (concentration and stable isotope ratio) and titration alkalinity.

Suggested Citation:

Xinping Hu. 2018. Water column data from the northern Gulf of Mexico hypoxic zone collected in August 2016. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7GF0S2N

Purpose:

To examine the relationship between oxygen consumption and dissolved inorganic carbon (DIC) production in bottom waters.

Data Parameters and Units:

Date (MM/DD/YYYY) Time (HH:MM:SS UTC) Latitude (decimal degrees) Longitude (decimal degrees) Pressure (DB) Temperature (°C) Dissolved oxygen (DO, µmol/kg) Stable carbon isotopic ratio of the dissolved inorganic carbon (d13CDIC, ‰) Dissolved inorganic carbon (DIC, µmol/kg) Titration alkalinity (TA, µmol/kg)

Methods:

d13CDIC was measured using a Delta V Plus mass spectrometer with dual inlet and reported relative to Pee Dee Belemnite (PDB). The precision of the isotope analysis was 70.1‰. DIC analysis: 0.5 mL water sample was acidified by 0.5 mL 10% H3PO4 using a 2.5 mL syringe pump. The released CO2 was analyzed on an AS-C3 DIC analyzer (Apollo SciTech). TA analysis: 25 mL water sample was titrated with a 0.1 M HCl solution (in 0.5 M NaCl) using an AS-ALK2 alkalinity titrator (Apollo SciTech). Temperature of the titration vessel was maintained at 22 6 0.18C using a water-jacketed circulation system. Certified Reference Material or CRM (Dickson et al. 2003) was used to construct the standard curve for the DIC analysis and to calibrate the acid used for TA titration. DIC and TA analyses both had a precision of 0.1%.

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