Mapping Isotopic and Dissolved Organic Matter Baselines in Waters and Sediments of the Gulf of Mexico

  • Jeffrey P. ChantonEmail author
  • Aprami Jaggi
  • Jagoš R. Radović
  • Brad E. Rosenheim
  • Brett D. Walker
  • Stephen R. Larter
  • Kelsey Rogers
  • Samantha Bosman
  • Thomas B. P. Oldenburg


The Deepwater Horizon oil spill released petroleum hydrocarbons that were depleted in δ13C and Δ14C at depth into the Gulf of Mexico. Stable-carbon and radiocarbon isotopic values and high-resolution mass spectrometry were used to follow the distributions of this petroleum and to track its transformation into petrocarbon, a term used to describe crude oil or transformed crude oil following biodegradation, weathering, oxygenation, or loss of lighter components. The term petrocarbon includes oil- or methane-derived carbon assimilated or incorporated into microbial biomass or into the food web as well as degraded and undegraded petroleum constituents. Here we report (1) the increase in the relative abundance of oxygen-containing carbon compounds making up the dissolved organic matter (DOM) with increasing depth through the water column, indicating the biodegradation of DOM as it was transported to depth in the water column, (2) the finding of 14C depletion in DOM indicating petrocarbon inputs, and (3) the decrease and subsequent increase of 14C in the isotopic composition of sinking particles indicating the capture of petrocarbon in sediment traps. In addition, we discuss the 14C depletion of this material once it is sedimented to the seafloor and the implications for oil spill budgets of seafloor petrocarbon deposition.


Organic carbon Sediment organic matter Radiocarbon Dissolved organic matter Gulf baselines FTICR-MS High-resolution mass spectrometry Ramped pyrolysis 


Funding Information

This research was made possible by grants from the Gulf of Mexico Research Initiative through its consortia: the Center for the Integrated Modeling and Analysis of the Gulf Ecosystem (C-IMAGE), Ecosystem Impacts of Oil and Gas Inputs to the Gulf (ECOGIG), Deep Sea to Coast Connectivity in the Eastern Gulf of Mexico (Deep-C), and the Consortium for Advanced Research of Transport of Hydrocarbon in the Environment (CARTHE). We also acknowledge funding from an American Chemical Society (ACS) Petroleum Research Fund (PRF) New Directions (ND) grant (to B.D.W).


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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Jeffrey P. Chanton
    • 1
    Email author
  • Aprami Jaggi
    • 2
  • Jagoš R. Radović
    • 2
  • Brad E. Rosenheim
    • 3
  • Brett D. Walker
    • 4
    • 5
  • Stephen R. Larter
    • 2
  • Kelsey Rogers
    • 1
  • Samantha Bosman
    • 1
  • Thomas B. P. Oldenburg
    • 2
  1. 1.Florida State University, Department of Earth, Ocean and Atmospheric ScienceTallahasseeUSA
  2. 2.University of Calgary, PRG, Department of GeoscienceCalgaryCanada
  3. 3.University of South Florida, College of Marine ScienceSt. PetersburgUSA
  4. 4.University of California, Irvine -Department of Earth System ScienceIrvineUSA
  5. 5.Now at: University of Ottawa, Department of Earth and Environmental SciencesOttawaCanada

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