Abstract:

Sediment samples from the northern Gulf of Mexico were collected with multi-corers on research cruises during 16 September - 30 October 2010, 23 May - 11 June 2011, and 29 May - 28 June 2014. The sediment was analyzed for indicators of contamination from the Deepwater Horizon, including total petroleum hydrocarbons (TPH), 44 major polycyclic aromatic hydrocarbons (PAH44), and barium (BA). Furthermore, the grain size was analyzed to determine the mud (silt + clay) content of the sediments. Analyses of variance (ANOVA) were conducted to determine, if any of the measured contaminants varied significantly between impact and non-impact zones (as defined by Montagna et al. (2013) Deep-sea benthic footprint of the Deepwater Horizon blowout) or between the different sampling times.

Suggested Citation:

Paul Montagna. 2017. Temporal analysis of NRDA sediment chemistry data, northern Gulf of Mexico, 2010, 2011, and 2014. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7GQ6VSX

Publications:

Washburn, T. W., Reuscher, M. G., Montagna, P. A., Cooksey, C., & Hyland, J. L. (2017). Macrobenthic community structure in the deep Gulf of Mexico one year after the Deepwater Horizon blowout. Deep Sea Research Part I: Oceanographic Research Papers, 127, 21–30. doi:10.1016/j.dsr.2017.06.001

Reuscher, M. G., Baguley, J. G., Conrad-Forrest, N., Cooksey, C., Hyland, J. L., Lewis, C., Montagna, P. A., Ricker, R. W., Rohal, M., & Washburn, T. (2017). Temporal patterns of Deepwater Horizon impacts on the benthic infauna of the northern Gulf of Mexico continental slope. PLOS ONE, 12(6), e0179923. https://doi.org/10.1371/journal.pone.0179923

Purpose:

The analysis of PAH44, TPH, and BA content in sediment samples from 2010, 2011, and 2014 was conducted to determine how the Deepwater Horizon oil contamination progressed over time.

Data Parameters and Units:

PAH44-List: List of PAH analytes included in the sum of PAH44, Analytical laboratory, analyte name, CAS number Data worksheet: Data for the top 0-3 cm sediments; Treatment zone (TRTzone, impact or non-impact), Year, Label for treatment and year (Zone_Year), Station name, Latitude (decimal degrees), Longitude (decimal degrees), Water depth (m), Distance from DWH wellhead (Wellhead, km), Distance from nearest oil seep (Seep, km), Impact zone based on Montagna et al. 2013 (Zone, 1 2 3 or 4), total petroleum hydrocarbons (TPH, ppm), Sum of 44 major polcyclic aromatic hydrocarbons (PAH44, ppb), barium (ppm), silt + clay fractions (mud, %), Log total petroleum hydrocarbons (lTPH, ppm), Log sum of 44 polcyclic aromatic hydrocarbons (lPAH44, ppb), log Barium (lBa, ppm), log silt + clay fractions (lMud, %) Summary worksheet: Sample year, Treatment zone (TRTzone, impact or non-impact), Type of summary statistic (group number), Number of samples in group, Total petroleum hydrocarbons mean (TPH, ppm), Standard error (SD_TPH), Sum of polcyclic aromatic hydrocarbons mean (PAH44, ppb), Standard error (SD_PAH44), Barium mean (Ba, ppm), Standard error (SD_Ba), silt + clay fractions mean (mud, %), Standard error (SD_Mud), Log total petroleum hydrocarbons mean (lTPH, ppm), Standard error (SD_lTPH), Log sum of 44 polcyclic aromatic hydrocarbons mean (lPAH44, ppb), Standard error (SD_lPAH44), Log Barium mean (lBa, ppm), Standard error (SD_lBa) Mixed-ANOVA worksheet: analysis of variance tables for the chemical responses

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