Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL074155 |
Stable and radiocarbon isotopic composition of dissolved organic matter in the Gulf of Mexico | |
Walker, B. D.1; Druffel, E. R. M.1; Kolasinski, J.2,3,4; Roberts, B. J.5; Xu, X.1; Rosenheim, B. E.2,3 | |
2017-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:16 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; France |
英文摘要 | Dissolved organic carbon (DOC) is of primary importance to marine ecosystems and the global carbon cycle. Stable carbon (C-13) and radiocarbon (C-14) isotopic measurements are powerful tools for evaluating DOC sources and cycling. However, the isotopic signature of DOC in the Gulf of Mexico (GOM) remains almost completely unknown. Here we present the first DOC C-14 and C-13 depth profiles from the GOM. Our results suggest the Mississippi River exports large amounts of DOC with an anthropogenic bomb C-14 signature. Riverine DOC is removed and recycled offshore, and some marine production of DOC is observed in the river plume. Offshore profiles show that DOC has higher C-14 than its Caribbean feed waters, indicative of a modern deep DOC source in the GOM basin. Finally, high DOC with negative C-13 and C-14 values were observed near the Macondo Wellhead, suggesting a transformation of Deepwater Horizon hydrocarbons into a persistent population of DOC. Plain Language Summary The Deepwater Horizon (DWH) spill released 4.1-4.6 million barrels of oil over 87days to the deep Gulf of Mexico (GOM) and is considered one of humankind's largest environmental disasters. Now, 7years after DWH, a significant portion of this oil (10-25%) remains unaccounted for. We estimate that 10-16% of DWH hydrocarbon has been incorporated into marine dissolved organic carbon (DOC)the largest organic C reservoir in the ocean. Our results suggest that natural GOM bacteria transformed much of the spilled petroleum and methane into natural DOC molecules, effectively dissolving this C into deep ocean water. Our results also highlight the dynamic cycling of DOC in the GOM basinincluding the rapid removal of modern Mississippi River C as its plume moves offshore and a modern C contribution to the deep GOM DOC reservoir. |
英文关键词 | dissolved organic matter Gulf of Mexico radiocarbon dissolved organic carbon C-13 oil spill |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000410658800040 |
WOS关键词 | WATER-HORIZON OIL ; TEMPORAL VARIABILITY ; LOWER MISSISSIPPI ; WELL BLOWOUT ; CARBON-CYCLE ; OCEAN ; TRANSPORT ; ABUNDANCE ; GRAPHITE ; DYNAMICS |
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/27983 |
专题 | 气候变化 |
作者单位 | 1.Keck Carbon Cycle AMS Lab, Dept Earth Syst Sci, Irvine, CA 92612 USA; 2.Univ S Florida, Coll Marine Sci, St Petersburg, FL USA; 3.Tulane Univ Louisiana, Earth & Environm Sci, New Orleans, LA USA; 4.Univ La Reunion, UMR ENTROPIE, Labex Corail, St Denis, France; 5.Louisiana Univ Marine Consortium, DeFelice Marine Ctr, Chauvin, LA 70344 USA |
推荐引用方式 GB/T 7714 | Walker, B. D.,Druffel, E. R. M.,Kolasinski, J.,et al. Stable and radiocarbon isotopic composition of dissolved organic matter in the Gulf of Mexico[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(16). |
APA | Walker, B. D.,Druffel, E. R. M.,Kolasinski, J.,Roberts, B. J.,Xu, X.,&Rosenheim, B. E..(2017).Stable and radiocarbon isotopic composition of dissolved organic matter in the Gulf of Mexico.GEOPHYSICAL RESEARCH LETTERS,44(16). |
MLA | Walker, B. D.,et al."Stable and radiocarbon isotopic composition of dissolved organic matter in the Gulf of Mexico".GEOPHYSICAL RESEARCH LETTERS 44.16(2017). |
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