Title: Short-lived radioisotope, sediment core photographs, and bulk density/porewater data from sediment cores collected aboard R/V Weatherbird II and R/V Justo Sierra cruises in the Gulf of Mexico from 2015-07-30 to 2015-10-01 Abstract: This dataset contains short-lived radioisotope (SLRad), sediment core photographs, and bulk density/porewater data from sediment cores collected aboard R/V Weatherbird II and R/V Justo Sierra cruises in the Gulf of Mexico from 2015-07-30 to 2015-10-01. Bulk density/porewater data reports measurements of sediment sample wet weight (g) and dry weight (g) for core sub-samples at 2mm sampling intervals for “surficial unit” and 5mm sampling resolution intervals to the base of cores. SLRad data were generated for selected core sub-samples. For sediment-core photograph data, sediment cores were longitudinally split and photographed with a Nikon D5100 digital camera with a scale in metric units (cm and mm) for a visual representation of sediment stratigraphy, color, and visual properties. Start Date: 2015-07-30 End Date: 2015-10-01 Seaname: GCMD Location Keywords: OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF MEXICO National Oceanographic Data Center (NODC) Place Keywords: Coastal Waters of Gulf of Mexico Gulf of Mexico Submitter Place Keywords: Gulf of Mexico West, East, North and South Boundary: -97.223, -84.97275, 29.7453, 18.69698 Observation Type Keywords: National Oceanographic Data Center (NODC) Observation Type Keywords: in situ geological laboratory analyses sediment analysis visual observation Instrument Type Keywords: Global Change Master Directory (GCMD) Instrument Type Keywords: In Situ/Laboratory Instruments > Corers > SEDIMENT CORERS In Situ/Laboratory Instruments > Samplers > Grabbers/Traps/Collectors > GRAB SAMPLERS Earth Remote Sensing Instruments > Passive Remote Sensing > Photon/Optical Detectors > HPGE > Hyperpure Germanium Submitter Provided Instrument Type Keywords: Series HPGe (High-Purity Germanium) Coaxial Planar Photon Detectors Ocean Instrument MC-800 Multicore Shipek Grab Sampler Multilple Corer Nikon D5100 Data Type Keywords: Submitter Provided Data Type Keywords: Sediment cores Surface sediment samples Dry sediment bulk density Percent porewater Short-lived radioisotopes Sediment core photographs Sediment stratigraphy Global Change Master Directory (GCMD) Data Type Science Keywords: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > MARINE GEOCHEMISTRY EARTH SCIENCE > OCEANS > MARINE SEDIMENTS > SEDIMENT CHEMISTRY EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > RADIOISOTOPES Climate and Forecast Standard Keywords: gulf_of_mexico depth Submitter: Bipana Sigdel Gulf of Mexico Research Initiative Information & Data Cooperative (GRIIDC) Bipana.Sigdel@tamucc.edu People: Steven A Murawski Principal Investigator University of South Florida / College of Marine Science 140 7th Ave South St. Petersburg, Florida 33701 USA smurawski@usf.edu Gregg R. Brooks Primary Point of Contact Eckerd College / Marine Science Natural Sciences Collegium Sheen Science Center, SHA-102 St. Petersburg, Florida 33711 USA brooksgr@eckerd.edu Rebekka Larson Additional Point of Contact University of South Florida / College of Marine Science 140 7th Ave South St. Petersburg, Florida 33701 USA larsonra@eckerd.edu Author List: Brooks, Gregg R. Larson, Rebekka Project Keywords Funding Institution Keywords: Gulf of Mexico Research Initiative (GoMRI) Gulf of Mexico Research Initiative Information & Data Cooperative (GRIIDC) Submitter Project Keywords: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC) Deepwater Horizon oil spill event (DWH) Center for the Integrated Modeling and Analysis of Gulf Ecosystems II (C-IMAGE II) NODC Project Keywords: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC) Gulf of Mexico Research Initiative (GoMRI) Deepwater Horizon oil spill event (DWH) Platforms Keywords: ICES Platforms Keyword: Weatherbird, Justo Sierra NODC Platforms Keyword: WEATHERBIRD, JUSTO SIERRA Submitter Provided Platform Keyword: R/V Weatherbird; R/V Justo Sierra citation suggestion and the associated publications: 1. GRIIDC UDI: R4.x267.000:0107: Gregg Brooks and Rebekka Larson. 2019. Bulk density/porewater data from sediment cores collected onboard R/V Weatherbird II cruises WB-0815 and WB-0915 in the Gulf of Mexico from 2015-08-16 to 2015-10-01. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-qzyx-sz24 2. GRIIDC UDI: R4.x267.000:0110: Gregg Brooks and Rebekka Larson. 2019. Bulk density/porewater data from sediment cores collected onboard R/V Weatherbird II cruise WB-0915 and R/V Justo Sierra cruise JS-0815 in the southern Gulf of Mexico from 2015-07-30 to 2015-09-29. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-4ftq-vg31 3. GRIIDC UDI: R4.x267.000:0130: Gregg Brooks and Rebekka Larson. 2019. Sediment core photographs collected aboard R/V Weatherbird II cruises WB-0815 and WB-0915 in the northern Gulf of Mexico from 2015-08-16 to 2015-10-01. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-tf6e-ct11 4. GRIIDC UDI: R4.x267.000:0123: Gregg Brooks and Rebekka Larson. 2019. Short-lived radioisotope (SLRad) data collected aboard R/V Weatherbird II cruises WB-0815 and WB-0915 in the northern Gulf of Mexico from 2015-08-16 to 2015-10-01. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-4j4h-7w93 5. GRIIDC UDI: R4.x267.000:0131: Gregg Brooks and Rebekka Larson. 2019. Sediment core photographs collected aboard R/V Weatherbird II cruise WB-0915 and R/V Justo Sierra cruise JS-0815 in the southern Gulf of Mexico from 2015-07-30 to 2015-09-29. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-qs55-ks63 Supplemental information - data parameters and units: 1. GRIIDC dataset R4.x267.000:0107; Bulk density/porewater data from August to October, 2015: 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. 2. GRIIDC dataset R4.x267.000:0110; Bulk density/porewater data from July to September, 2015: 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.x267.000:0130; Sediment core photographs data from August to October, 2015: 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). 4. GRIIDC dataset R4.x267.000:0123; Short-lived radioisotope (SLRad) data from August to October, 2015: 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. 5. GRIIDC dataset R4.x267.000:0131; Sediment core photographs data from July to September, 2015: 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). Cruise IDs: WB-0815; WB-0915; and JS-0815