Abstract:
This dataset contains short-lived radioisotope (SLRad) data collected aboard R/V Weatherbird II cruise WB-0517 in the Gulf of Mexico from 2017-05-11 to 2017-05-23. SLRad data are generated for selected core sub-samples at 2mm sampling intervals for “surficial unit” and 5mm sampling resolution intervals to the base of cores. SLRad data generated include sample activity as disintegrations per minute per gram(dpm/g) of 1) Excess Thorium-234 (234Thxs) activity, which is calculated by measuring the total Thorium-234 (234ThTot) activity and the subtraction of the measured or estimated “Supported” Thorium-234 (234ThSup) activity, 2) Excess Lead-210 (210Pbxs) activity, which is calculated by measuring the total Lead-210 (210PbTot) activity and subtraction of the measured background "supported" Lead-210 (210PbSup) activity {average of Lead-214 (214Pb) at 295 kiloelectron volts (keV), 214Pb at 351keV, and Bismuth-214 (214Bi) at 609keV}, 3) Cesium-137 (137Cs) activity, and 4) Berilium-7 (7Be) activity. The dataset contains the location, date, water depth of core site in meters (m), core collection date, site identification (ID), core identification (ID), top depth of Interval in millimeters (mm), bottom depth of interval in millimeters (mm), average depth of interval in millimeters (mm), average of top and bottom depths and a variety of SLRad data. The cruise documentation was provided for the R/V Weatherbird II cruise WB-0517, led by chief scientists Dr. Steve Murawski and Dr. David Hollander. This dataset supports the publications: Armenteros, M., Schwing, P. T., Larson, R. A., Díaz-Asencio, M., Martínez-Suárez, A., Fernández-Garcés, R., … Brooks, G. R. (2019). Geochemical and Faunal Characterization in the Sediments off the Cuban North and Northwest Coast. Scenarios and Responses to Future Deep Oil Spills, 147–159. doi:10.1007/978-3-030-12963-7_9; and Brooks, G. R., Larson, R. A., Schwing, P. T., Diercks, A. R., Armenteros, M., Diaz-Asencio, M., … Hollander, D. J. (2019). Gulf of Mexico (GoM) Bottom Sediments and Depositional Processes: A Baseline for Future Oil Spills. Scenarios and Responses to Future Deep Oil Spills, 75–95. doi:10.1007/978-3-030-12963-7_5.
Suggested Citation:
Gregg Brooks, Rebekka Larson, and Patrick Schwing. 2019. Short-lived radioisotope (SLRad) data collected aboard R/V Weatherbird II cruise WB-0517 in the Gulf of Mexico from 2017-05-11 to 2017-05-23. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-78ae-7m58
Data Parameters and Units:
Latitude of core site (decimal degrees), Longitude of core site (decimal degrees), Water depth of core site in meters (m), Core collection Date (MM/DD/YYYY), Site Identification (ID), Core Identification (ID), Top Depth of Interval in millimeters (mm), Bottom Depth of Interval in millimeters (mm), Average Depth of Interval in millimeters (mm), average of Top and Bottom Depths, Total 210Pb (210PbTot) measured at 46keV activity as disintegrations per minute per gram (dpm/g), Total 210Pb (210PbTot) measured at 46keV error in activity as disintegrations per minute per gram (dpm/g), Total 234Th (234ThTot) measured at 63keV activity as disintegrations per minute per gram (dpm/g), Total 234Th (234ThTot) measured at 63keV error in activity as disintegrations per minute per gram (dpm/g), Re-Analysis for 234Th (234ThSup estimate) activity (dpm/g) after >120 day from core collection, Re-Analysis for 234Th (234ThSup estimate) activity error (dpm/g) after >120 day from core collection, 137Cs measured at 661keV activity as disintegrations per minute per gram (dpm/g), 137Cs measured at 661keV error in activity as disintegrations per minute per gram (dpm/g), 7Be measured at 477keV activity as disintegrations per minute per gram (dpm/g), 7Be measured at 477keV error in activity as disintegrations per minute per gram (dpm/g), 214Pb measured at 295keV activity as disintegrations per minute per gram (dpm/g), 214Pb measured at 295keV error in activity as disintegrations per minute per gram (dpm/g), 214Pb measured at 351keV activity as disintegrations per minute per gram (dpm/g), 214Pb measured at 351keV error in activity as disintegrations per minute per gram (dpm/g), 214Bi measured at 609keV activity as disintegrations per minute per gram (dpm/g), 214Bi measured at 609keV error in activity as disintegrations per minute per gram (dpm/g), Supported 210Pb (210PbSup) activity calculated by averaging the activities (dpm/g) of 214Pb (295keV), 214Pb (351keV), and 214Bi, Supported 210Pb (210PbSup) activity error calculated by averaging the errors (dpm/g) of 214Pb (295keV), 214Pb (351keV), and 214Bi, Excess 210Pb (210Pbxs) activity calculated by subtracting 210PbSup activity (dpm/g) from 210PbTot activity (dpm/g), Excess 210Pb (210Pbxs) activity error (compound error of 210PbSup activity error (dpm/g) and 210PbTot activity error (dpm/g)), Excess 234Th (234Thxs) calculated by subtracting 234ThSup activity (dpm/g) from 234ThTot activity (dpm/g), Excess 234Th (234Thxs) activity error (dpm/g), Decay Corrected (DC) Excess 234Th (234Thxs) calculated using the 234Thxs activity, time between core collection and sample analysis, and to correct for lost activity due to decay during this time, Decay Corrected (DC) Excess 234Th (234Thxs) activity error (dpm/g).
Note: Blank cell denotes no analysis performed, and *ND = Not Detected.
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