Sediment samples, ammonium and methane data collected during R/V Atlantis cruise AT26-13 in the northern Gulf of Mexico from 2014-03-31 to 2014-04-21 (NCEI Accession 0175003)

Data Parameters and Units: AT26-13_ECOGIG.csv file includes: Location, Alvin Dive (dive number), Collection type, Lat (latitude, degrees decimal minutes), Long (longitude, degrees decimal minutes), Date (dd/mm/yyyy), Time (L, Local), Time (Z, zulu), Depth (m, sampling depth of seafloor), Depth Range (cm, depth in sediment), Sediment pH, Porewater pH, salinity (psu), NH4 (uM), NO2(um), NOx (uM, NO3+NO2), NO3 (um), DIN (uM, dissolved inorganic nitrogen), TDN (um, total dissolved nitrogen), NH4 (uM, used for DON measurement), DON (uM, dissolved organic nitrogen), PO4 (uM), DOC (uM, dissolved organic carbon), CH4 (uM), H2 (nM), H2S (mM), Sulfate (mM), Sodium (mM), Potassium (mM), Magnesium (mM), Calcium (mM), Methane Oxidation (pmol cc-1 d-1), Sulfate Reduction (pmol cc-1 day-1), Porosity (%), SOM (LOI, %), TPN (%, total particulate nitrogen), TPC (%, total particulate carbon), POC (%, particulate organic carbon), PIC (%, particulate inorganic carbon), TPP (umol P/g sed, total particulate phosphorus), TPP (%, total particulate phosphorus);

GOM-Northern-Gulf-Ammonium.txt file includes: Date (MM/DD/YYYY), Site, Site ID, Latitude (Decimal minutes), Longitude (Decimal minutes), Plume/Background (sample collected in vs 100m adjacent to bubble plume), Depth (meters), Fluorescence (fluorescence units), calc conc (calculated concentration of ammonium, micromolar), Mean Conc (ammonium, nM), Std Dev (standard deviation, nM), Std Error (Standard error, nM);

GOM-Northern-Gulf-CH4.tx file includes: Depth (m), Full Time (MM/DD/YYYY HH:MM), Site (region), Site ID (Block number), Temperature 1 from Mets1 G107 E312 (deg C), CH4 from Mets1 G107 E312 (nmol/L), Laser CH4 (ppmv), Temperature from Laser (deg C), Laser CH4(nmols)