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DOI | 10.1073/pnas.1618926114 |
Enhanced CO2 uptake at a shallow Arctic Ocean seep field overwhelms the positive warming potential of emitted methane | |
Pohlman, John W.1; Greinert, Jens2,3,4; Ruppel, Carolyn1; Silyakova, Anna3; Vielstaedte, Lisa2; Casso, Michael1; Mienert, Jurgen3; Bunz, Stefan3 | |
2017-05-23 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2017 |
卷号 | 114期号:21页码:5355-5360 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Germany; Norway; Netherlands |
英文摘要 | Continued warming of the Arctic Ocean in coming decades is projected to trigger the release of teragrams (1 Tg = 10(6) tons) of methane from thawing subsea permafrost on shallow continental shelves and dissociation of methane hydrate on upper continental slopes. On the shallow shelves (< 100 m water depth), methane released from the seafloor may reach the atmosphere and potentially amplify global warming. On the other hand, biological uptake of carbon dioxide (CO2) has the potential to offset the positive warming potential of emitted methane, a process that has not received detailed consideration for these settings. Continuous sea-air gas flux data collected over a shallow ebullitive methane seep field on the Svalbard margin reveal atmospheric CO2 uptake rates (-33,300 +/-7,900 mu mol m(-2) . d(-1)) twice that of surrounding waters and similar to 1,900 times greater than the diffusive sea-air methane efflux (17.3 +/- 4.8 mu mol m(-2) . d(-1)). The negative radiative forcing expected from this CO2 uptake is up to 231 times greater than the positive radiative forcing from the methane emissions. Surface water characteristics (e.g., high dissolved oxygen, high pH, and enrichment of C-13 in CO2) indicate that upwelling of cold, nutrient-rich water from near the seafloor accompanies methane emissions and stimulates CO2 consumption by photosynthesizing phytoplankton. These findings challenge the widely held perception that areas characterized by shallow-water methane seeps and/or strongly elevated sea-air methane flux always increase the global atmospheric greenhouse gas burden. |
英文关键词 | methane carbon dioxide greenhouse gas emissions marine biogeochemistry Arctic Ocean |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000401797800035 |
WOS关键词 | GULF-OF-MEXICO ; SURFACE WATERS ; GAS-EXCHANGE ; SEA-FLOOR ; SVALBARD ; SHELF ; ATMOSPHERE ; EMISSIONS ; FLUXES ; MARGIN |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
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/204715 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.US Geol Survey, Woods Hole Coastal & Marine Sci Ctr, Woods Hole, MA 02543 USA; 2.GEOMAR Helmholtz Ctr Ocean Res, Dept Marine Geosyst, D-24148 Kiel, Germany; 3.Arctic Univ Norway, Univ Tromso, Ctr Arctic Gas Hydrate Environm & Climate, Dept Geosci, N-9037 Tromso, Norway; 4.Royal Netherlands Inst Sea Res, Dept Marine Geol, AB Den Burg, Texel, Netherlands |
推荐引用方式 GB/T 7714 | Pohlman, John W.,Greinert, Jens,Ruppel, Carolyn,et al. Enhanced CO2 uptake at a shallow Arctic Ocean seep field overwhelms the positive warming potential of emitted methane[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(21):5355-5360. |
APA | Pohlman, John W..,Greinert, Jens.,Ruppel, Carolyn.,Silyakova, Anna.,Vielstaedte, Lisa.,...&Bunz, Stefan.(2017).Enhanced CO2 uptake at a shallow Arctic Ocean seep field overwhelms the positive warming potential of emitted methane.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(21),5355-5360. |
MLA | Pohlman, John W.,et al."Enhanced CO2 uptake at a shallow Arctic Ocean seep field overwhelms the positive warming potential of emitted methane".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.21(2017):5355-5360. |
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