DOI: 10.1007/s10533-017-0356-3
Scopus记录号: 2-s2.0-85021847195
论文题名: Are elusive anaerobic pathways key methane sinks in eutrophic lakes and reservoirs?
作者: Reed D.C. ; Deemer B.R. ; van Grinsven S. ; Harrison J.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 134, 期: 2018-01-02 起始页码: 29
结束页码: 39
语种: 英语
英文关键词: Anaerobic
; AQDS
; Lake
; Methane oxidation
; Organic acids
; Reactive transport modeling
Scopus关键词: air-water interaction
; anoxic conditions
; biogeochemical cycle
; lacustrine environment
; methane
; organic acid
; organic matter
; oxidation
; reactive transport
; reservoir
英文摘要: Collectively, freshwaters constitute a significant source of methane to the atmosphere, and both methane production and methane oxidation can strongly influence net emissions. Anaerobic methane oxidation (AOM) is recognized as a strong regulator of marine methane emissions and appreciation of AOM’s importance in freshwater is growing. In spite of this renewed interest, recent work and reactive-transport modeling results we present in this paper point to unresolved pathways for AOM. Comparison of recent observations from a eutrophic reservoir, Lacamas Lake, with predictions of a 1D steady-state model of water column methane dynamics indicates that high rates of methane oxidation measured via bottle assays cannot be explained with conventional electron acceptors (O2, NO2 −, NO3 −, SO4 2−, Mn4+, and Fe3+). Reactive-transport modeling suggests that solute oxidant concentrations at the thermocline would have to be around 10 times higher than observed to explain the measured methane consumption. Organic acids—a major constituent of organic matter—may account for part of this unexplained AOM given their abundance in eutrophic systems, although the details of these pathways remain elusive (e.g., which species are involved, seasonal renewal of reduced species, contribution of particulate versus dissolved phases). We point to several observations consistent with organic acid-mediated AOM, both in Lacamas Lake and in other systems. Nevertheless, direct evidence of this pathway is still lacking and testing for this remains an important direction for future work. To this end, we identify several new avenues of research that would help quantify the role of organic acid-mediated AOM relative to other electron acceptors. © 2017, Springer International Publishing AG. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83266
Appears in Collections: 气候减缓与适应 气候变化事实与影响
There are no files associated with this item.
作者单位: School of the Environment, Washington State University Vancouver, Vancouver, WA, United States; U.S. Geological Survey, Southwest Biological Science Center, 2255 N Gemini Dr, Flagstaff, AZ, United States; Department of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research, Utrecht University, Den Burg, Netherlands; Bedford Institute of Oceanography, Fisheries and Oceans Canada, 1 Challenger Drive, PO Box 100, Dartmouth, Canada
Recommended Citation:
Reed D.C.,Deemer B.R.,van Grinsven S.,et al. Are elusive anaerobic pathways key methane sinks in eutrophic lakes and reservoirs?[J]. Biogeochemistry,2017-01-01,134(2018-01-02)