Sea ice in the Arctic Ocean: Role of shielding and consumption of methane * Xin He<http://www.sciencedirect.com/science/article/pii/S1352231012009934>a<http://www.sciencedirect.com/science/article/pii/S1352231012009934#aff1>, 1<http://www.sciencedirect.com/science/article/pii/S1352231012009934#fn1>, * Liguang Sun<http://www.sciencedirect.com/science/article/pii/S1352231012009934>a<http://www.sciencedirect.com/science/article/pii/S1352231012009934#aff1>, [Corresponding author contact information] <http://www.sciencedirect.com/science/article/pii/S1352231012009934#cor1> , 1<http://www.sciencedirect.com/science/article/pii/S1352231012009934#fn1>, [E-mail the corresponding author] <mailto:[email protected]> , * Zhouqing Xie<http://www.sciencedirect.com/science/article/pii/S1352231012009934>a<http://www.sciencedirect.com/science/article/pii/S1352231012009934#aff1>, [Corresponding author contact information] <http://www.sciencedirect.com/science/article/pii/S1352231012009934#cor2> , [E-mail the corresponding author] <mailto:[email protected]> , * Wen Huang<http://www.sciencedirect.com/science/article/pii/S1352231012009934>a<http://www.sciencedirect.com/science/article/pii/S1352231012009934#aff1>, * Nanye Long<http://www.sciencedirect.com/science/article/pii/S1352231012009934>a<http://www.sciencedirect.com/science/article/pii/S1352231012009934#aff1>, * Zheng Li<http://www.sciencedirect.com/science/article/pii/S1352231012009934>a<http://www.sciencedirect.com/science/article/pii/S1352231012009934#aff1>, * Guangxi Xing<http://www.sciencedirect.com/science/article/pii/S1352231012009934>b<http://www.sciencedirect.com/science/article/pii/S1352231012009934#aff2>
* a Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China * b Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China * http://dx.doi.org/10.1016/j.atmosenv.2012.10.029 * Permissions & Reprints<http://www.sciencedirect.com/science?_ob=RedirectURL&_method=outwardLink&_partnerName=936&_eid=1-s2.0-S1352231012009934&_pii=S1352231012009934&_origin=article&_zone=art_page&_targetURL=https%3A%2F%2Fs100.copyright.com%2FAppDispatchServlet%3FpublisherName%3DELS%26contentID%3DS1352231012009934%26orderBeanReset%3Dtrue&_acct=C000055388&_version=1&_userid=1928924&md5=cc4fb9d842132e7bb8cc7a4fb57db0ff> ________________________________ Abstract Sources and sinks of methane, one of the most important greenhouse gases, have attracted intensive attention due to its role in global warming. We show that sea ice in the Arctic Ocean regulates methane level through two mechanisms, shielding of methane emission from the ocean, and consumption of methane. Using a static chamber technique, we estimated that the methane flux from under-ice water was 0.56 mg(CH4) m−2 d−1 on average in central Arctic Ocean, relatively higher than that in other oceans, indicating considerable methane storage in this region under sea ice. Average methane flux on under-ice water was higher than that above sea ice, which suggests that sea ice could limit methane emission. In addition, negative fluxes on sea ice suggest that there are methane consuming processes, which are possibly associated with both photochemical and biochemical oxidation. Our results provide a general understanding about how sea ice in Arctic affects regional and global methane balance. ________________________________ Highlights ► We compared methane fluxes under two conditions, with and without ice cover. ► There is considerable methane potentially storing in central Arctic Ocean. ► Sea ice limits methane emission in Arctic. ► Sea ice absorbs methane in atmosphere potentially related to both photochemical and biochemical oxidation. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
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