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DOI | 10.1029/2019GL082867 |
Oxygen Isotopes (delta O-18) Trace Photochemical Hydrocarbon Oxidation at the Sea Surface | |
Ward, Collin P.1; Sharpless, Charles M.2; Valentine, David L.3,4; Aeppli, Christoph5; Sutherland, Kevin M.1,6; Wankel, Scott D.1; Reddy, Christopher M.1 | |
2019-06-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:12页码:6745-6754 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Although photochemical oxidation is an environmental process that drives organic carbon (OC) cycling, its quantitative detection remains analytically challenging. Here, we use samples from the Deepwater Horizon oil spill to test the hypothesis that the stable oxygen isotope composition of oil (delta O-18(Oil)) is a sensitive marker for photochemical oxidation. In less than one-week, delta O-18(Oil) increased from -0.6 to 7.2, a shift representing similar to 25% of the delta O-18(OC) dynamic range observed in nature. By accounting for different oxygen sources (H2O or O-2) and kinetic isotopic fractionation of photochemically incorporated O-2, which was -9 parts per thousand for a wide range of OC sources, a mass balance was established for the surface oil's elemental oxygen content and delta O-18. This delta O-18-based approach provides novel insights into the sources and pathways of hydrocarbon photo-oxidation, thereby improving our understanding of the fate and transport of petroleum hydrocarbons in sunlit waters, and our capacity to respond effectively to future spills. Plain Language Summary Sunlight alters the physical and chemical properties of petroleum hydrocarbons released into aquatic ecosystems. These alterations impact the performance of chemical tools used in response to oil spills, and thus there is substantial interest in improving approaches to track these alterations and our understanding of the driving mechanisms. In this study, we developed a stable oxygen isotope-based approach to track photochemical oxidation of oil and validated it using samples from the 2010 Deepwater Horizon oil spill. Our isotope-based approach revealed two key insights into the photochemical oxidation mechanism. First, the major source of oxygen added to the oil by sunlight appears to be molecular oxygen rather than water. Second, molecular oxygen kinetic isotope fractionation during photochemical oxidation was remarkably similar for a wide range of organic carbon types, such as crude oil and dissolved organic carbon, raising the possibility of a common step in the oxidation mechanism. This new stable oxygen isotope-based approach will improve our capacity to respond effectively to future oil spills, and can be applied to track the cycling of a broad range of organic carbon sources. |
英文关键词 | petroleum hydrocarbons photochemical oxidation Deepwater Horizon stable oxygen isotopes organic carbon |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000477616300065 |
WOS关键词 | WATER-HORIZON OIL ; FREE AMINO-ACIDS ; ORGANIC-MATTER ; SINGLET OXYGEN ; CLIMATIC INFORMATION ; STABLE-ISOTOPES ; BLACK CARBON ; PHOTOOXIDATION ; CELLULOSE ; FRACTIONATION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/184264 |
专题 | 气候变化 |
作者单位 | 1.Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA; 2.Univ Mary Washington, Dept Chem, Fredericksburg, VA USA; 3.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA; 4.Univ Calif Santa Barbara, Inst Marine Sci, Santa Barbara, CA 93106 USA; 5.Bigelow Lab Ocean Sci, East Boothbay, ME USA; 6.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA |
推荐引用方式 GB/T 7714 | Ward, Collin P.,Sharpless, Charles M.,Valentine, David L.,et al. Oxygen Isotopes (delta O-18) Trace Photochemical Hydrocarbon Oxidation at the Sea Surface[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(12):6745-6754. |
APA | Ward, Collin P..,Sharpless, Charles M..,Valentine, David L..,Aeppli, Christoph.,Sutherland, Kevin M..,...&Reddy, Christopher M..(2019).Oxygen Isotopes (delta O-18) Trace Photochemical Hydrocarbon Oxidation at the Sea Surface.GEOPHYSICAL RESEARCH LETTERS,46(12),6745-6754. |
MLA | Ward, Collin P.,et al."Oxygen Isotopes (delta O-18) Trace Photochemical Hydrocarbon Oxidation at the Sea Surface".GEOPHYSICAL RESEARCH LETTERS 46.12(2019):6745-6754. |
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