Transient seafloor venting on continental slopes from warming-induced methane hydrate dissociation
Transient seafloor venting on continental slopes from warming-induced methane hydrate dissociation
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DOI：
10.1002/2015gl067012
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发表时间：
2015-12-28
影响因子：
5.2
通讯作者：
Flemings, P. B.
中科院分区：
文献类型：
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作者：
Darnell, K. N.;Flemings, P. B.
海洋沉积物中冻结的水合物笼中的甲烷是地球上最大的碳库之一。最近对海底广泛甲烷渗漏的观测可能记录了海洋变暖造成的水合物分解，从而可能进一步放大气候变化。在这里，我们模拟海底变暖对海洋水合物矿床的影响，使用多相流模型。我们发现，水合物分解，气体迁移，和随后的水合物形成cangenerate暂时甲烷排放到海洋通过水合物稳定带。由于数千年前开始的变暖，通过东大西洋边缘水合物稳定区排放的甲烷渗出可能记录了这一过程。我们的研究结果与传统的观点，排气只发生在水合物稳定带的上倾。
Methane held in frozen hydrate cages within marine sediment comprises one of the largest carbon reservoirs on the planet. Recent submarine observations of widespread methane seepage may record hydrate dissociation due to oceanic warming, which consequently may further amplify climate change. Here we simulate the effect of seafloor warming on marine hydrate deposits using a multiphase flow model. We show that hydrate dissociation, gas migration, and subsequent hydrate formation cangenerate temporary methane venting into the ocean through the hydrate stability zone. Methane seeps venting through the hydrate stability zone on the eastern Atlantic margin may record this process due to warming begun thousands of years ago. Our results contrast with the traditional view that venting occurs only updip of the hydrate stability zone.