The response of methane hydrate beneath the seabed offshore Svalbard to ocean warming during the next three centuries
The response of methane hydrate beneath the seabed offshore Svalbard to ocean warming during the next three centuries
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DOI：
10.1002/grl.50985
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发表时间：
2013-10-16
影响因子：
5.2
通讯作者：
Sarkar, Sudipta
中科院分区：
文献类型：
--
作者：
Marin-Moreno, Hector;Minshull, Timothy A.;Sarkar, Sudipta
甲烷是一种强效的温室气体，从地质记录推断，水合物中甲烷的大规模快速释放可能导致了过去的气候突变。2008年在西斯瓦尔巴群岛大陆边缘的海床上发现了250多股甲烷气体，大约在400米的水深（mwd）处，这表明在今天的北极，水合物正在分解。在这里，我们模拟了2300年来含水合物沉积物的动态响应，并研究了在斯瓦尔巴群岛以西350-800海里范围内，海洋变暖作为当今和可能的未来水合物分解的可能原因。未来温度由HadGEM2和CCSM4两种气候模式以及代表性浓度路径（RCPs） 8.5和2.6两种情景给出。我们的研究结果表明，在接下来的三个世纪里，5.3-29千兆吉年（-1）的甲烷可能会释放到西斯瓦尔巴群岛边缘的北冰洋。
Methane is a potent greenhouse gas and large-scale rapid release of methane from hydrate may have contributed to past abrupt climate change inferred from the geological record. The discovery in 2008 of over 250 plumes of methane gas escaping from the seabed of the West Svalbard continental margin at similar to 400 m water depth (mwd) suggests that hydrate is dissociating in the present-day Arctic. Here we model the dynamic response of hydrate-bearing sediments over a period of 2300 years and investigate ocean warming as a possible cause for present-day and likely future dissociation of hydrate, within 350-800 mwd, west of Svalbard. Future temperatures are given by two climate models, HadGEM2 and CCSM4, and scenarios, Representative Concentration Pathways (RCPs) 8.5 and 2.6. Our results suggest that over the next three centuries 5.3-29 Gg yr(-1) of methane may be released to the Arctic Ocean on the West Svalbard margin.