globalchange  > 气候变化与战略
DOI: 10.1029/2018GB006026
论文题名:
Hydrologic Controls of Methane Dynamics in Karst Subterranean Estuaries
作者: Brankovits D.; Pohlman J.W.; Ganju N.K.; Iliffe T.M.; Lowell N.; Roth E.; Sylva S.P.; Emmert J.A.; Lapham L.L.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期:12
语种: 英语
英文关键词: aquifer ; biogeochemistry ; carbon cycle ; carbonate platform ; coastal zone ; concentration (composition) ; dry season ; food web ; hydrological regime ; karst ; methane ; microbial activity ; stable isotope ; subterranean environment ; wet season
学科: anchialine ecosystem ; carbon cycling ; coastal aquifer ; hydrobiogeochemistry ; methane ; subterranean estuary
中文摘要: Karst subterranean estuaries (KSEs) extend into carbonate platforms along 12% of all coastlines. A recent study has shown that microbial methane (CH 4 ) consumption is an important component of the carbon cycle and food web dynamics within flooded caves that permeate KSEs. In this study, we obtained high-resolution (~2.5-day) temporal records of dissolved methane concentrations and its stable isotopic content (δ 13 C) to evaluate how regional meteorology and hydrology control methane dynamics in KSEs. Our records show that less methane was present in the anoxic fresh water during the wet season (4,361 ± 89 nM) than during the dry season (5,949 ± 132 nM), suggesting that the wet season hydrologic regime enhances mixing of methane and other constituents into the underlying brackish water. The δ 13 C of the methane (−38.1 ± 1.7‰) in the brackish water was consistently more 13 C-enriched than fresh water methane (−65.4 ± 0.4‰), implying persistent methane oxidation in the cave. Using a hydrologically based mass balance model, we calculate that methane consumption in the KSE was 21–28 mg CH 4 ·m −2 ·year −1 during the 6-month dry period, which equates to ~1.4 t of methane consumed within the 102- to 138-km 2 catchment basin for the cave. Unless wet season methane consumption is much greater, the magnitude of methane oxidized within KSEs is not likely to affect the global methane budget. However, our estimates constrain the contribution of a critical resource for this widely distributed subterranean ecosystem. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160174
Appears in Collections:气候变化与战略

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作者单位: Department of Marine Biology, Texas A&M University at Galveston, Galveston, TX, United States; Now at Woods Hole Coastal and Marine Science Center, U.S. Geological Survey, Woods Hole, MA, United States; Now at Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Woods Hole Coastal and Marine Science Center, U.S. Geological Survey, Woods Hole, MA, United States; Lowell Instruments, North Falmouth, MA, United States; Onset Computer Corporation, Bourne, MA, United States; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Moody Gardens Aquarium, Galveston, TX, United States; Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons, MD, United States

Recommended Citation:
Brankovits D.,Pohlman J.W.,Ganju N.K.,et al. Hydrologic Controls of Methane Dynamics in Karst Subterranean Estuaries[J]. Global Biogeochemical Cycles,2018-01-01,32(12)
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