Abstract:

This dataset reports grain sizes from eight sediment samples collected using multicores during the R/V Weatherbird cruise from February 16th to 22nd, 2012. Grain sizes are reported as percent of the sample for 47 size classes. The percent mud content for each sample is calculated and samples are classified as mud or sandy mud. Results are reported in triplicate for each sample and the average for each sample is included. Samples were analyzed in the laboratory by laser diffraction.

Suggested Citation:

Huettel, Markus. 2016. Sediment grain size data from multicores collected during R/V Weatherbird II cruise, North shelf and DeSoto Canyon, February 16 – 22, 2012 (WB-1212). Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N70C4SR3

Purpose:

Grain size data are central for evaluating sediment properties, including permeability, surface area, porosity, and water content. These grain size data were assessed to gain information about the environment sedimenting oil was exposed to.

Data Parameters and Units:

Sample Name (S35_1013 collected at 29.33 -87.05, S36_1013 collected at 28.92 -87.67, AC4_1012 collected at 28.99 -87.46, AC5 collected at 28.95 -87.58, SOOPC3 collected at 28.99 -88.05, XC3_1012 collected at 28.98 -87.87, XC4_1012 collected at 28.64 -87.87, PCB06_1012 collected at 29.00 -87.51); Measurement date and time = date and time when instrument made measurement; Analysis date and time = date and time when instrument analyzed measurement; Particle refractive index; Particle absorption index; Dispersant name; Dispersant refractive index; Uniformity = uniformity of grain sizes in sample. For an equal weight of sediment the uniformity coefficient equals The sand grain size at which 60% goes through and 40 % is retained divided by the sand grain size at which 10% goes through and 90% is retained; Specific surface area = area per weight of dry sediment (m2/g); d (0.1) = the 10th percentile, i.e. the grain diameter at which 10% of the particles in the sample are smaller; d (0.5) = the 50th percentile, i.e. the grain diameter at which 50% of the particles in the sample are smaller; d (0.9) = the 90th percentile, i.e. the grain diameter at which 90% of the particles in the sample are smaller; Result (% of total dry weight) Between User Sizes (Sizes in µm) = percent of each sample with grains in one of 47 size classes: 0.42, 0.48, 0.55, 0.63, 0.72, 0.83, 0.95, 1.10, 1.26, 1.45, 1.66, 1.91, 2.19, 2.51, 2.88, 3.31, 3.80, 4.37, 5.01, 5.75, 6.61, 7.59, 8.71, 10.00, 11.48, 13.18, 15.14, 17.38, 19.95, 22.91, 26.30, 30.20, 34.67, 39.81, 45.71, 52.48, 60.26, 69.18, 79.43, 91.20, 104.71, 120.23, 138.04, 158.49, 181.97, 208.93, 239.88, 275.42, 316.23, 549.54, 630.96, 724.44, 831.76, 954.99, 1096.48, 1258.93, 1445.44, 1659.59, 1905.46; Percent Mud (Clay & Silt) = percent of sample with grain size less than 63 um; Composition = based on percent mud samples were classified as sandy mud or mud samples. The following stations were sampled: Station Lat Long AC4 28.99 -87.46 AC5 28.94 -87.58 PCB06 29.00 -87.51 S35 29.33 -87.05 S36 28.92 -87.67 Seep C 28.99 -88.05 XC3 28.98 -87.87 XC4 28.64 -87.8

Methods:

Data from sediment cores retrieved by multicorer during the WB 2012 cruise February 16 – 22, 2012. The sediment was analyzed for grain size spectrum through standard laser-based particle analysis. Samples were analyzed in the laboratory by laser diffraction. 7

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