DOI: 10.1007/s10533-016-0275-8
Scopus记录号: 2-s2.0-84995743889
论文题名: Processes affecting molecular and stable isotope compositions of sediment gas in estuarine waters along the southern Baltic coast (Poland)
作者: Woszczyk M. ; Kotarba M.J. ; Whiticar M. ; Schubert C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 131, 期: 2018-01-02 起始页码: 203
结束页码: 228
语种: 英语
英文关键词: Baltic
; Biogeochemistry
; Coastal lake
; Greenhouse gas
; Stable isotopes
英文摘要: This paper investigates the molecular and stable isotope compositions of sediment gases from seven coastal lakes along the southern Baltic coast in Poland. The aim is to extend the knowledge of the genesis and distribution of microbial gases in the zone of mixing of fresh and salt waters with special attention to the effect of salinity, climate-related seasonality, and vertical sediment mixing. We found differences in the compositions of gas between the studied lakes and within each lake. These differences are mainly controlled by lake water depth and the presence of macrophytes. Due to the dissolution of rising bubbles in highly oxygenated water, the concentrations of CH4 and CO2 show up to 67% decline along the water column in favor of N2 and O2. On the other hand, in vegetated parts of the lakes, the CH4 is depleted in favor of CO2, and the residual CH4 and CO2 are enriched in 13C. Despite the fact that the coastal lakes display highly oxidizing conditions in the water column and that the bottom sediments are mixed by wind waves the CH4 reveals rather low oxidation. On the basis of the CH4/N2 ratio we established that there are differences in the intensity of ebullition throughout the lakes. Higher intensities of ebullition were found in shallower parts of the lakes. Salinity has no effect on the stable C and H isotope composition of sediment gas. It seems, however, that salinity affects the molecular composition of hydrocarbons via preferential oxidation of CH4 under higher salinity conditions. © 2016, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83318
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Quaternary Geology & Paleogeography, Adam Mickiewicz University, B. Krygowskiego 12, Poznan, Poland; Department of Environmental Analyses, Cartography and Economical Geology, AGH University of Science and Technology, Mickiewicza 30, Kraków, Poland; School of Earth and Ocean Sciences, University of Victoria, PO Box 3055, Victoria, BC, Canada; Surface Water Research and Management, EAWAG, Seestrasse 79, Kastanienbaum, Switzerland
Recommended Citation:
Woszczyk M.,Kotarba M.J.,Whiticar M.,et al. Processes affecting molecular and stable isotope compositions of sediment gas in estuarine waters along the southern Baltic coast (Poland)[J]. Biogeochemistry,2016-01-01,131(2018-01-02)