A blast of gas in the latest Paleocene: Simulating first-order effects of massive dissociation of oceanic methane hydrateстатья из журнала
Аннотация: Research Article| March 01, 1997 A blast of gas in the latest Paleocene: Simulating first-order effects of massive dissociation of oceanic methane hydrate Gerald R. Dickens; Gerald R. Dickens 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109 Search for other works by this author on: GSW Google Scholar Maria M. Castillo; Maria M. Castillo 2School of Natural Resources, University of Michigan, Ann Arbor, Michigan 48109 Search for other works by this author on: GSW Google Scholar James C. G. Walker James C. G. Walker 3Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109 Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (3): 259–262. https://doi.org/10.1130/0091-7613(1997)025<0259:ABOGIT>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Gerald R. Dickens, Maria M. Castillo, James C. G. Walker; A blast of gas in the latest Paleocene: Simulating first-order effects of massive dissociation of oceanic methane hydrate. Geology 1997;; 25 (3): 259–262. doi: https://doi.org/10.1130/0091-7613(1997)025<0259:ABOGIT>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Carbonate and organic matter deposited during the latest Paleocene thermal maximum is characterized by a remarkable −2.5‰ excursion in δ13C that occurred over ∼104 yr and returned to near initial values in an exponential pattern over ∼2 × 105 yr. It has been hypothesized that this excursion signifies transfer of 1.4 to 2.8 × 1018 g of CH4 from oceanic hydrates to the combined ocean-atmosphere inorganic carbon reservoir. A scenario with 1.12 × 1018 g of CH4 is numerically simulated here within the framework of the present-day global carbon cycle to test the plausibility of the hypothesis. We find that (1) the δ13C of the deep ocean, shallow ocean, and atmosphere decreases by −2.3‰ over 104 yr and returns to initial values in an exponential pattern over ∼2 × 105 yr; (2) the depth of the lysocline shoals by up to 400 m over 104 yr, and this rise is most pronounced in one ocean region; and (3) global surface temperature increases by ∼2 °C over 104 yr and returns to initial values over ∼2 × 106 yr. The first effect is quantitatively consistent with the geologic record; the latter two effects are qualitatively consistent with observations. Thus, significant CH4 release from oceanic hydrates is a plausible explanation for observed carbon cycle perturbations during the thermal maximum. This conclusion is of broad interest because the flux of CH4 invoked during the maximum is of similar magnitude to that released to the atmosphere from present-day anthropogenic CH4 sources. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Год издания: 1997
Издательство: Geological Society of America
Источник: Geology
Ключевые слова: Methane Hydrates and Related Phenomena, Atmospheric and Environmental Gas Dynamics, Geology and Paleoclimatology Research
Открытый доступ: closed
Том: 25
Выпуск: 3
Страницы: 259–259