Hydraulic reversals and episodic methane emissions during drought cycles in mires

Abstract

Research Article| March 01, 1993 Hydraulic reversals and episodic methane emissions during drought cycles in mires Edwin A. Romanowicz; Edwin A. Romanowicz 1Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070 Search for other works by this author on: GSW Google Scholar Donald I. Siegel; Donald I. Siegel 1Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070 Search for other works by this author on: GSW Google Scholar Paul H. Glaser Paul H. Glaser 2Limnological Research Center, University of Minnesota, Minneapolis, Minnesota 55455 Search for other works by this author on: GSW Google Scholar Author and Article Information Edwin A. Romanowicz 1Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070 Donald I. Siegel 1Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070 Paul H. Glaser 2Limnological Research Center, University of Minnesota, Minneapolis, Minnesota 55455 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (3): 231–234. https://doi.org/10.1130/0091-7613(1993)021<0231:HRAEME>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 Edwin A. Romanowicz, Donald I. Siegel, Paul H. Glaser; Hydraulic reversals and episodic methane emissions during drought cycles in mires. Geology 1993;; 21 (3): 231–234. doi: https://doi.org/10.1130/0091-7613(1993)021<0231:HRAEME>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 Reversals in hydraulic head and extensive methane losses were identified during a drought cycle from changes in hydraulic-head and dissolved-methane profiles in peat, Glacial Lake Agassiz Peatlands, northern Minnesota, United States. During the summer 1990 drought, regional ground water discharged from the mineral soil underlying the peat to raised bogs. Concentrations of dissolved CH4 in pore water showed that much of the peat column was supersaturated with respect to a reference standard of I atm partial pressure CH4. By the summer of 1991, the severity of the drought lessened, and the upper peat column was resaturated with precipitation-derived water. Ground-water flow was then controlled by local, precipitation-driven, recharge flow systems, and the regional ground water that was discharged affected only the peat immediately above the mineral soil-peat interface. In contrast, during the summer of 1991, concentrations of dissolved CH4 in pore water were all undersaturated with respect to 1 atm partial pressure CH4. The decrease in the amount of dissolved CH4, in the pore water from the summer of 1990 to the summer of 1991 probably was caused by changes in the CH4 flux and degassing to the unsaturated zone and to a lesser extent by changes in the partial pressure of gaseous CH4 in the peat as the peat volume increased with expansion as it resaturated. 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.