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A Model of the Methane Cycle, Permafrost, and Hydrology of the Siberian Continental Margin : Volume 12, Issue 10 (21/05/2015)

By Archer, D.

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Book Id: WPLBN0003974947
Format Type: PDF Article :
File Size: Pages 22
Reproduction Date: 2015

Title: A Model of the Methane Cycle, Permafrost, and Hydrology of the Siberian Continental Margin : Volume 12, Issue 10 (21/05/2015)  
Author: Archer, D.
Volume: Vol. 12, Issue 10
Language: English
Subject: Science, Biogeosciences
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Archer, D. (2015). A Model of the Methane Cycle, Permafrost, and Hydrology of the Siberian Continental Margin : Volume 12, Issue 10 (21/05/2015). Retrieved from

Description: University of Chicago, Department of the Geophysical Sciences, Chicago, USA. A two-dimensional model of a sediment column, with Darcy fluid flow, biological and thermal methane production, and permafrost and methane hydrate formation, is subjected to glacial–interglacial cycles in sea level, alternately exposing the continental shelf to the cold atmosphere during glacial times and immersing it in the ocean in interglacial times. The glacial cycles are followed by a long-tail 100 kyr warming due to fossil fuel combustion.

The salinity of the sediment column in the interior of the shelf can be decreased by hydrological forcing to depths well below sea level when the sediment is exposed to the atmosphere. There is no analogous advective seawater-injecting mechanism upon resubmergence, only slower diffusive mechanisms. This hydrological ratchet is consistent with the existence of freshwater beneath the sea floor on continental shelves around the world, left over from the last glacial period.

The salt content of the sediment column affects the relative proportions of the solid and fluid H2O-containing phases, but in the permafrost zone the salinity in the pore fluid brine is a function of temperature only, controlled by equilibrium with ice. Ice can tolerate a higher salinity in the pore fluid than methane hydrate can at low pressure and temperature, excluding methane hydrate from thermodynamic stability in the permafrost zone. The implication is that any methane hydrate existing today will be insulated from anthropogenic climate change by hundreds of meters of sediment, resulting in a response time of thousands of years.

The strongest impact of the glacial–interglacial cycles on the atmospheric methane flux is due to bubbles dissolving in the ocean when sea level is high. When sea level is low and the sediment surface is exposed to the atmosphere, the atmospheric flux is sensitive to whether permafrost inhibits bubble migration in the model. If it does, the atmospheric flux is highest during the glaciating, sea level regression (soil-freezing) part of the cycle rather than during deglacial transgression (warming and thawing).

The atmospheric flux response to a warming climate is small, relative to the rest of the methane sources to the atmosphere in the global budget, because of the ongoing flooding of the continental shelf. The increased methane flux due to ocean warming could be completely counteracted by a sea level rise of tens of meters on millennial timescales due to the loss of ice sheets, decreasing the efficiency of bubble transit through the water column. The model results give no indication of a mechanism by which methane emissions from the Siberian continental shelf could have a significant impact on the near-term evolution of Earth's climate, but on millennial timescales the release of carbon from hydrate and permafrost could contribute significantly to the fossil fuel carbon burden in the atmosphere–ocean–terrestrial carbon cycle.

A model of the methane cycle, permafrost, and hydrology of the Siberian continental margin

Archer, D. and Brovkin V.: The millennial lifetime of fossil fuel CO2, Climatic Change, 90, 283–297, 2008.; Archer, D. E., Buffett, B. A., and McGuire, P. C.: A two–dimensional model of the passive coastal margin deep sedimentary carbon and methane cycles, Biogeosciences, 9, 2859–2878, doi:10.5194/bg-9-2859-2012, 2012.; Archer, D. E., Eby, M., Brovkin, V., Ridgewell, A. J., Cao, L., Mikolajewicz, U., Caldeira, K., Matsueda, H., Munhoven, G., Montenegro, A., and Tokos, K.: Atmospheric lifetime of fossil fuel carbon dioxide, Ann. Rev. Earth Planet Sci., 37, 117–34, 2009.; Cramer, B. and Franke, D.: Indications for an active petroleum system in the Laptev Sea, NE Siberia, J. Petrol. Geol., 28, 369–383, 2005.; Dutta, K., Schuur, E. A. G., Neff, J. C., and Zimov S. A.:, Potential carbon release from permafrost soils of Northeastern Siberia, Glob. Change Biol., 12, 2336–2351, 2006.; Gavrilov, A. V., Romanovskii, X. N., Romanovsky, V. E., Hubberten, H. W., and Tumskoy, V. E.: Reconstruction of ice complex remnants on the eastern Siberian Arctic Shelf, Permafrost Periglac., 14, 187–198, 2003.; Gentz, T., Damm, E., von Deimling, J. S., Mau, S., McGinnis, D. F., and Schluter, M.: A water column study of methane around gas flares located at the West Spitsbergen continental margin, Continent. Shelf Res., 72, 107–118, 2014.; Hunt, J. M.: Petroleum Geochemistry and Geology, 743 pp., Freeman, New York, 1995.; Hill, J. C., Driscoll, N. W., Weissel, J. K., and Goff, J. A.: Large-scale elongated gas blowouts along the US Atlantic margin, J. Geophys. Res.-Solid Earth, 109, B09101, doi:10.1029/2004JB002969, 2004.; Post, V. E. A., Groen, J., Kooi, H., Person, M., Ge, S. M., and Edmunds, W. M.: Offshore fresh groundwater reserves as a global phenomenon, Nature, 504, 71–78, 2013.; Khvorostyanov, D. V., Ciais, P., Krinner, G., Zimov, S. A., Corradi, C., and Guggenberger, G.: Vulnerability of permafrost carbon to global warming. Part II: sensitivity of permafrost carbon stock to global warming, Tellus B, 60, 265–275, 2008a.; Khvorostyanov, D. V., Krinner, G., Ciais, P., Heimann, M., and Zimov, S. A.: Vulnerability of permafrost carbon to global warming, Part I: model description and role of heat generated by organic matter decomposition, Tellus B, 60, 250–264, 2008b.; Kooi, H., Groen, J., and Leijnse, A.: Modes of seawater intrusion during transgressions, Water Resour. Res., 36, 3581–3589, 2000.; Kort, E. A., Wofsy, S. C., Daube, B. C., Diao, M., Elkins, J. W., Gao, R. S., Hintsa, E. J., Hurst, D. F., Jimenez, R., Moore, F. L., Spackman, J. R. and Zondlo, M. A.: Atmospheric observations of Arctic Ocean methane emissions up to 82 degrees north, Nat. Geosci., 5, 318–321, 2012.; Lu, C. and Werner, A. D.: Timescales of seawater intrusion and retreat, Adv. Water Resour., 59, 39–51, 2013.; Martin, P. A., Lea, D. W., Rosenthal, Y., Shackleton, N. J., Sarnthein, M., and Papenfuss, T.: Quaternary deep sea temperature histories derived from benthic foraminiferal Mg/Ca, Earth Planet. Sci. Lett., 198, 193–209, 2002.; Mienert, J., Vanneste, M., Bunz, S., Andreassen, K., Haflidason, H., and Sejrup, H. P.: Ocean warming and gas hydrate stability on the mid-Norwegian margin at the Storegga Slide, Mar. Petrol.Geol., 22, 233–244, 2005.; Moore, W. S., Carlson, C. A., and Giovannoni, S. J.: The Effect of Submarine Groundwater Discharge on the Ocean, Annual Review of Marine Science, 2, 59–88, 2011.; Nicolsky, D. and Shakhova, N.: Modeling sub-sea permafrost in the East Siberian Arctic Shelf: the Dmitry Laptev Strait, Environ. Res. Lett., 5, 015006, doi:10.1088/1748-9326/5/1/015006, 2010.; Nicolsky, D. J., Romanovsky, V. E., Romanovskii, N. N., Kholodov, A. L., Shakhova, N. E., and Semiletov, I. P.: Modeling sub-sea permafrost in the East Siberian Arctic


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