Abstract:

Dataset includes analysis of sediment collected during the R/V Endeavor cruise EN559 in the northern Gulf of Mexico from 2015-05-29 to 2015-06-20 at cold-seep and control sites. Measurements include concentration of pore water dissolved nutrients, dissolved organics, cations, anions and dissolved gases. Process rate measurements were also measured, including methane oxidation rate and sulfate reduction rate.

Suggested Citation:

Samantha Joye. 2018. Sediment ​geochemistry and​ ​​process rate​ measurements collected during R/V Endeavor cruise EN559 in the northern Gulf of Mexico from 2015-05-29 to 2015-06-20. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7348HG7

Publications:

Zhuang, G.-C., Montgomery, A., Sibert, R. J., Rogener, M.-K., Samarkin, V. A., & Joye, S. B. (2018). Effects of pressure, methane concentration, sulfate reduction activity, and temperature on methane production in surface sediments of the Gulf of Mexico. Limnology and Oceanography. doi:10.1002/lno.10925

Purpose:

The purpose of this dataset is to assess the impacts of the Deepwater Horizon blowout on sediment chemistry on fallout sites and compare these impacts to naturally occurring oil and gas seeps.

Data Parameters and Units:

Location (BOEM lease block); Station; Event; Collection type (MUC=multiple core); Lat (Latitude, degrees decimal minutes); Long (Longitude, degrees decimal minutes); Date (dd/mm/yy); Time (Local, L); Time (Zulu, Z); Depth (meters below surface, m); Depth range in sediment (cm); Mid-point depth (cm); sediment pH; porewater pH; Salinity (psu); Ammonium (NH4, uM); Nitrite (NO2, uM); Nitrate + nitrite (NOx, uM); Nitrate (NO3, uM); Dissolved Inorganic Nitrogen (DIN, uM); Total Dissolved Nitrogen (TDN, uM); Ammonium (NH4 lab for DON calculation, uM); Dissolved Organic Nitrogen (DON, uM); Dissolved Phosphate (PO4, uM); Total Dissolved Phosphorus (TDP, uM); Dissolved Organic Phosphorus (DOP, uM); Dissolved Inorganic Nitrogen to Phosphorus ratio (DIN:DIP, molar ratio); Dissolved Organic Nitrogen to Phosphorus ratio (DON:DOP, molar ratio); Dissolved Organic Carbon (DOC, uM); Dissolved Methane (CH4, nM); Molecular Hydrogen (H2, nM); Hydrogen Sulfide (H2S, mM); Sulfate (mM); Chloride (mM); Sodium (mM); Potassium (mM); Magnesium (mM); Calcium (mM); Methane Oxidation (pmol cc-1 d-1); Sulfate Reduction (nmol cc-1 d-1); Porosity (%); Solid Organic Matter (Lost on ignition, %); Total particulate Nitrogen (TPN, %) Total Particulate Carbon (TPC, %); Particulate Organic Carbon (POC, %) Particulate Inorganic Carbon (PIC, %); Total Particulate Phosphorus (TPP, umol P/g sed, %); Overlaying water (OLW); N.D.=no data (analysis not performed); B.D.L.=Below Detection Limit; N.S.=Not sampled

Individual Files: