Dynamics of gas hydrates in polar marine environments.

极地海洋环境中天然气水合物的动力学。

• 批准号: NE/D005728/2
• 负责人: Timothy Minshull
• 金额: $ 33.58万
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FD005728%2F2
• 关键词: Dynamics; gas; hydrates; polar; marine

Almost half of the Earth's carbon is stored in gas hydrates and related shallow gas deposits. Numerical models predict that this reservoir is highly mobile and that escaping gas has a significant potential to accelerate climate change releasing as much as 2000 Gt of methane over a short period of time. As methane is a potent greenhouse gas it would course further global warming. Arctic gas hydrates are most vulnerable to future climate change because (1) it is predicted that temperatures will increase faster in the Arctic than in low latitudes (2) the intercept of the gas hydrate stability zone with the seabed is within the reach of fast warming surface waters and (3) the water column above the vulnerable zone of gas hydrates is smaller than in warmer oceans facilitating more efficient transport of greenhouse gases to the atmosphere. We propose an interdisciplinary consortium to quantify the present amount of gas hydrates through seismic methods, to measure current methane flux from the seabed to the atmosphere, to detect the effects of postglacial warming on the gas hydrate system, and to predict the effect of a range of future temperature changes on the gas hydrates. This information will allow a detailed assessment of the mobility of Arctic gas hydrates and it will significantly decrease the uncertainties involved in climate modelling.

地球几乎一半的碳存储在气体水合物和相关的浅气沉积物中。数值模型预测，该储层是高度流动性的，并且逃脱的气体在短时间内释放了多达2000 GT甲烷的气候变化具有巨大的潜力。由于甲烷是一种有效的温室气体，因此将进一步全球变暖。北极气水合物最容易受到未来气候变化的影响，因为（1）可以预测，北极的温度将比低纬度地区的温度升高（2）在海床上的拦截气体水合物稳定区域在快速变暖的地表水域范围内，并且（3）（3）易于的气体在较小的层面上，高于温暖的海洋水平高于较小的高度高度高度高于温暖的海洋水平。我们提出了一个跨学科财团，以通过地震方法量化当前数量的气体水合物，以测量从海床到大气的当前甲烷通量，以检测冰期变暖对气体水合物系统的影响，并预测一系列未来温度变化对气体水合物的影响。该信息将允许对北极气体水合的活动性进行详细评估，并将大大减少气候建模所涉及的不确定性。

项目成果

Fluxes and fate of dissolved methane released at the seafloor at the landward limit of the gas hydrate stability zone offshore western Svalbard

• DOI: 10.1002/2015jc011084
• 发表时间: 2015-09-01
• 期刊: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
• 影响因子: 3.6
• 作者: Graves, Carolyn A.;Steinle, Lea;James, Rachael H.
• 通讯作者: James, Rachael H.

Methane in shallow subsurface sediments at the landward limit of the gas hydrate stability zone offshore western Svalbard

• DOI: 10.1016/j.gca.2016.11.015
• 发表时间: 2017-02-01
• 期刊: GEOCHIMICA ET COSMOCHIMICA ACTA
• 影响因子: 5
• 作者: Graves, Carolyn A.;James, Rachael H.;Connelly, Douglas P.
• 通讯作者: Connelly, Douglas P.

Removal of methane through hydrological, microbial, and geochemical processes in the shallow sediments of pockmarks along eastern Vestnesa Ridge (Svalbard)

• DOI: 10.1002/lno.10299
• 发表时间: 2016-11
• 期刊: Limnology and Oceanography
• 影响因子: 4.5
• 作者: W. Hong;S. Sauer;G. Panieri;W. Ambrose;R. James;A. Plaza-Faverola;A. Schneider

Characterization of a stratigraphically constrained gas hydrate system along the western continental margin of Svalbard from ocean bottom seismometer data

• DOI: 10.1029/2011jb008211
• 发表时间: 2011-12-10
• 期刊: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
• 影响因子: 3.9
• 作者: Chabert, Anne;Minshull, Tim A.;Sarkar, Sudipta
• 通讯作者: Sarkar, Sudipta

Geochemical response of the mid-depth Northeast Atlantic Ocean to freshwater input during Heinrich events 1 to 4

海因里希事件1至4期间东北大西洋中深度对淡水输入的地球化学响应

• DOI: 10.1016/j.quascirev.2016.08.035
• 发表时间: 2016
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: Crocker A