Gas chromatography-mass spectrometry characterization, short-lived radioisotope, and other sediment data collected aboard R/V Weatherbird cruise WB-0814 in the northern Gulf of Mexico from 2014-08-14 to 2014-08-28 (NCEI Accession 0226099)

Data parameters and units:

1. GRIIDC dataset R4.x267.000:0082; GC-MS characterization data: File “sampling sites” includes sampling station id, sediment core collection date (mm/dd/yyyy), latitude and longitude (degrees minutes), water depth (m).

File “Characterization of marine cores from the northern Gulf of Mexico using GC-MS.xlsx”: Sample id (station id label and depth intervals (in mm) within each core), organic compounds ration acronyms, biomarker ratios. The following organic compounds were included in this analysis and in parenthesis the acronym and the mass-to-charge ratio (m/z): 4-methyl dibenzothiophene (4MDBT, 198); 1-methyl dibenzothiophene (1MDBT, 198); 2+3-methyl dibenzothiophene (2,3MDBT, 198); dibenzothiophene (DBT, 184); methylphenantrene index (MPI-1, 192; calculated as 1.5*(2-methyl phenanthrene+3-methyl phenanthrene)/(phenanthrene+1-methyl phenanthrene+9-methyl phenanthrene)); 18a(H)-22,29,30-trisnorneohopane (Ts, 191); 17a(H)-22,29,30-trisnorneohopane (Tm, 191); C29 17a(H),21 b(H) hopane (29H, 191); C30 17a(H),21 b(H) hopane (30H, 191); 18-a(H)-30-norneohopane (29Ts, 191); C21 Tricyclic terpane (21TT, 191); C23 Tricyclic terpane (23TT, 191); C24 Tricyclic terpane (24TT, 191); C30-moretane (30M/30H, 191); C29 5a(H), 14a(H), 17a(H) 20S sterane (29aaaS, 217); C29 5a(H), 14a(H), 17a(H) 20R sterane (29aaaR, 217); C29 5a(H),14b(H),17b(H) 20S sterane+C29 5a(H),14b(H),17b(H) 20R sterane (29abb(S+R), 217); C27 5a(H), 14b(H), 17b(H) 20S sterane+C27 5a(H), 14b(H), 17b(H) 20R sterane (27abb(S+R), 218); C28 5a(H), 14b(H), 17b(H) 20S sterane+C28 5a(H), 14b(H), 17b(H) 20R sterane (28abb(S+R), 218); Pristane (Pr, 85); Phytane (Ph, 85); C17-normal alkane (C17, 85); C18-normal alkane (C17, 85).

2. GRIIDC dataset R4.x267.000:0109; Bulk density/porewater data: Latitude and longitude of core site (decimal degrees), water depth of core site (m), core collection date (mm/dd/yyyy), site identification (ID), core identification (id), top depth of interval (mm), bottom depth of interval (mm), average depth of interval (mm), sediment wet weight (g), sediment dry weight (g), sample volume (cm3), bulk density (g/cm3), porewater (%), laboratory/facility analysis was performed at. Bulk density was calculated using sediment dry weight (g) and sample volume (cm3). Blank cell denotes analysis not performed for the interval, no data generated.

3. GRIIDC dataset R4.x267.000:0122; Short-lived radioisotope data: Water depth of core site (m), core collection date (mm/dd/yyyy), site identification (ID), sediment core identification (ID), top depth of interval (mm), bottom depth of interval (mm), average depth of interval (mm), 210Pb (Lead) total (dpm/g), 210Pb (Lead) total error (dpm/g), 234Th (Thorium) Total (dpm/g), 234Th (Thorium) error (dpm/g), re-Analysis of 234Th (Thorium) activity (dpm/g) represent 234ThSup (“supported” Thorium), re-Analysis of 234Th (Thorium) activity error (dpm/g) represent 234ThSup (“supported” Thorium), 137Cs (Caesium) activity (dpm/g), 137Cs (Caesium) activity error (dpm/g), 7Be (Beryllium) activity (dpm/g), 7Be (Beryllium) activity error (dpm/g), 214Pb (Lead, 295 keV) activity (dpm/g), 214Pb (Lead, 295 keV) actvity error (dpm/g), 214Pb (Lead, 351 keV) activity (dpm/g), 214Pb (Lead, 351 keV) actvity error (dpm/g), 214Bi (Bismuth) activity (dpm/g), 214Bi (Bismuth) activity error (dpm/g), 210PbSup (“supported” Lead) activity (dpm/g), 210PbSup (“supported” Lead) activity error (dpm/g), 210Pbxs (Excess Lead) activity (dpm/g), 210Pbxs (Excess Lead) activity error (dpm/g), decay corrected 210Pbxs (Excess Lead) activity (dpm/g), decay corrected 210Pbxs (Excess Lead) activity error (dpm/g), 234Thxs (Excess Thorium) activity (dpm/g), 234Thxs (Excess Thorium) activity error (dpm/g), decay corrected 234Thxs (Excess Thorium) activity (dpm/g), decay corrected 234Thxs (Excess Thorium) activity error (dpm/g), laboratory/ facility analysis was performed at: Eckerd College, St. Petersburg FL. Blank cell denotes no analysis performed.

4. GRIIDC dataset R4.x267.000:0129; Sediment core photographs data: Dataset contains sediment core photographs (unitless). An excel spreadsheet contains all the photographs filename, the corresponding core id, collection date (mm/dd/yyyy), latitude and longitude (degrees minutes, decimal degrees), and water depth (m).

5. GRIIDC dataset R4.x267.000:0138; Sediment texture and composition data: Sediment core collection latitude and longitude (decimal degrees), water depth (m), core collection date (mm/dd/yyyy), site identification (ID), core identification (ID), top depth of interval (mm), bottom depth of interval (mm), average depth of interval (average of top and bottom depths, mm), percent gravel (by dry weight), percent sand (by dry weight), percent silt (by dry weight), percent clay (by dry weight), percent mud (calculated by adding percent silt and clay, by dry weight), percent carbonate (by dry weight), percent total organic matter (TOM) by loss on ignition (LOI) (by dry weight), percent other (non-carbonate, non-organic; by dry weight), laboratory/facility where analysis was performed.