DOI: 10.1007/s10533-018-0421-6
Scopus记录号: 2-s2.0-85040764400
论文题名: Freeze-thaw cycles of Arctic thaw ponds remove colloidal metals and generate low-molecular-weight organic matter
作者: Pokrovsky O.S. ; Karlsson J. ; Giesler R.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 137, 期: 3 起始页码: 321
结束页码: 336
语种: 英语
英文关键词: Bog
; Carbon
; Fen
; Metal
; Peat
; Ultrafiltration
Scopus关键词: arctic environment
; bog
; carbon cycle
; colloid
; fen
; freeze-thaw cycle
; latitude
; metal
; molecular analysis
; organic matter
; peat
; permafrost
; pollutant removal
; pond
; reservoir
; seasonal variation
; thawing
; trace element
; ultrafiltration
; Norrbotten
; Stordalen Mire
; Sweden
; Sweden
英文摘要: High-latitude boreal and arctic surface/inland waters contain sizeable reservoirs of dissolved organic matter (DOM) and trace elements (TE), which are subject to seasonal freezing. Specifically, shallow ponds and lakes in the permafrost zone often freeze solid, which can lead to transformations in the colloidal and dissolved fractions of DOM and TE. Here, we present results from experimental freeze-thaw cycles using iron (Fe)- and DOM-rich water from thaw ponds situated in Stordalen and Storflaket palsa mires in northern Sweden. After ten cycles of freezing, 85% of Fe and 25% of dissolved organic carbon (DOC) were removed from solution in circumneutral fen water (pH 6.9) but a much smaller removal of Fe and DOC (< 7%) was found in acidic bog water (pH 3.6). This removal pattern was consistent with initial supersaturation of fen water with respect to Fe hydroxide and a lack of supersaturation with any secondary mineral phase in the bog water. There was a nearly two- to threefold increase in the low-molecular-weight (LMW) fraction of organic carbon (OC) and several TEs caused by the repeated freeze-thaw cycles. Future increases in the freeze-thaw frequency of surface waters with climate warming may remove up to 25% of DOC in circumneutral organic-rich waters. Furthermore, an increase of LMW OC may result in enhanced carbon dioxide losses from aquatic ecosystems since this fraction is potentially more susceptible to biodegradation. © 2018, Springer International Publishing AG, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83180
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: GET (Géosciences Environnement Toulouse, UMR 5563, CNRS), 14 Avenue Edouard Belin, Toulouse, France; N. Laverov Federal Center for Integrated Arctic Research, Russian Academy of Science, Arkhangel’sk, Russian Federation; BIO-GEO-CLIM Laboratory, Tomsk State University, 35 Lenina, Tomsk, Russian Federation; Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden
Recommended Citation:
Pokrovsky O.S.,Karlsson J.,Giesler R.. Freeze-thaw cycles of Arctic thaw ponds remove colloidal metals and generate low-molecular-weight organic matter[J]. Biogeochemistry,2018-01-01,137(3)