Sensitivity of the global submarine hydrate inventory to scenarios of future climate change
Sensitivity of the global submarine hydrate inventory to scenarios of future climate change
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DOI：
10.1016/j.epsl.2013.02.017
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发表时间：
2013-04-01
影响因子：
5.3
通讯作者：
Rees, J. G.
中科院分区：
文献类型：
--
作者：
Hunter, S. J.;Goldobin, D. S.;Rees, J. G.
全球海底甲烷水合物的库存被认为是相当可观的。海洋水合物的稳定性对温度和压力的变化很敏感，一旦不稳定，水合物就会将甲烷释放到沉积物和海洋中，并可能释放到大气中，从而对气候变化产生积极的反馈。在这里，我们介绍了一项多模型研究的结果，该研究调查了甲烷水合物库存如何动态响应未来气候和海平面变化的不同情景。结果表明，即使在中等变暖情景(RCP 4.5)下，假设海平面上升的速度相当极端(最高可达20毫米/年)，气候变暖导致的海平面下降仍占主导地位。在下个世纪，模拟的水合物分解集中在顶部，类似于北极和亚北极沉积物的100米，低于30-50Tg CH4年(-1)，尽管随后在水柱中的氧化可能会将大气中的峰值释放速率降低到0.75-1.4Tg CH4年(-1)。(C)2013爱思唯尔B.V.保留所有权利。
The global submarine inventory of methane hydrate is thought to be considerable. The stability of marine hydrates is sensitive to changes in temperature and pressure and once destabilised, hydrates release methane into sediments and ocean and potentially into the atmosphere, creating a positive feedback with climate change. Here we present results from a multi-model study investigating how the methane hydrate inventory dynamically responds to different scenarios of future climate and sea level change. The results indicate that a warming-induced reduction is dominant even when assuming rather extreme rates of sea level rise (up to 20 mm yr(-1)) under moderate warming scenarios (RCP 4.5). Over the next century modelled hydrate dissociation is focussed in the top similar to 100 m of Arctic and Subarctic sediments beneath 30-50 Tg CH4 yr(-1)), although subsequent oxidation in the water column could reduce peak atmospheric release rates to 0.75-1.4 Tg CH4 yr(-1). (C) 2013 Elsevier B.V. All rights reserved.