Temporal Constraints on Hydrate-Controlled Methane Seepage off Svalbard

被引：221

作者：

Berndt, C. ^{[1
]}

Feseker, T. ^{[2
,3
]}

Treude, T. ^{[1
]}

Krastel, S. ^{[1
]}

Liebetrau, V. ^{[1
]}

Niemann, H. ^{[4
]}

Bertics, V. J. ^{[1
]}

Dumke, I. ^{[1
]}

Duennbier, K. ^{[1
]}

Ferre, B. ^{[5
]}

Graves, C. ^{[6
]}

Gross, F. ^{[1
]}

Hissmann, K. ^{[1
]}

Huehnerbach, V. ^{[6
]}

Krause, S. ^{[1
]}

Lieser, K. ^{[1
]}

Schauer, J. ^{[1
]}

Steinle, L. ^{[4
]}

机构：

[1] GEOMAR Helmholtz Ctr Ocean Res Kiel, D-24148 Kiel, Germany

[2] Univ Bremen, MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany

[3] Univ Bremen, Fac Geosci, D-28359 Bremen, Germany

[4] Univ Basel, Dept Environm Sci, CH-4056 Basel, Switzerland

[5] Univ Tromso, Dept Geol, CAGE Ctr Arctic Gas Hydrate Environm & Climate, N-9037 Tromso, Norway

[6] Natl Oceanog Ctr, Southampton SO14 3ZH, Hants, England

来源：

SCIENCE | 2014年 / 343卷 / 6168期

基金：

瑞士国家科学基金会;

关键词：

CONTINENTAL MARGINS; RELEASE; SITES;

D O I：

10.1126/science.1246298

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Methane hydrate is an icelike substance that is stable at high pressure and low temperature in continental margin sediments. Since the discovery of a large number of gas flares at the landward termination of the gas hydrate stability zone off Svalbard, there has been concern that warming bottom waters have started to dissociate large amounts of gas hydrate and that the resulting methane release may possibly accelerate global warming. Here, we corroborate that hydrates play a role in the observed seepage of gas, but we present evidence that seepage off Svalbard has been ongoing for at least 3000 years and that seasonal fluctuations of 1 degrees to 2 degrees C in the bottom-water temperature cause periodic gas hydrate formation and dissociation, which focus seepage at the observed sites.

引用

页码：284 / 287

页数：4

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