DOI: 10.1002/2016GL068609
论文题名: Dissolved black carbon in Antarctic lakes: Chemical signatures of past and present sources
作者: Khan A.L. ; Jaffé R. ; Ding Y. ; McKnight D.M.
刊名: Geophysical Research Letters
ISSN: 0094-8998
EISSN: 1944-8729
出版年: 2016
卷: 43, 期: 11 起始页码: 5750
结束页码: 5757
语种: 英语
英文关键词: Antarctic lakes
; cryosphere
; dissolved black carbon
; fate and transport
; limnology
; recalcitrance
Scopus关键词: Aquatic ecosystems
; Degradation
; Fossil fuels
; Fuels
; Lakes
; Limnology
; Surface waters
; Black carbon
; Chemical compositions
; Cryosphere
; Fate and transport
; Fossil fuel combustion
; Photochemical degradation
; Recalcitrance
; Saline surface waters
; Dissolution
英文摘要: The perennially ice-covered, closed-basin lakes in the McMurdo Dry Valleys, Antarctica, serve as sentinels for understanding the fate of dissolved black carbon from glacial sources in aquatic ecosystems. Here we show that dissolved black carbon can persist in freshwater and saline surface waters for thousands of years, while preserving the chemical signature of the original source materials. The ancient brines of the lake bottom waters have retained dissolved black carbon with a woody chemical signature, representing long-range transport of black carbon from wildfires. In contrast, the surface waters are enriched in contemporary black carbon from fossil fuel combustion. Comparison of samples collected 25 years apart from the same lake suggests that the enrichment in anthropogenic black carbon is recent. Differences in the chemical composition of dissolved black carbon among the lakes are likely due to biogeochemical processing such as photochemical degradation and sorption on metal oxides. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84973571918&doi=10.1002%2f2016GL068609&partnerID=40&md5=faa49cfb6b97874ad7e366d43c718ce8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9961
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Civil and Environmental Engineering and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Khan A.L.,Jaffé R.,Ding Y.,et al. Dissolved black carbon in Antarctic lakes: Chemical signatures of past and present sources[J]. Geophysical Research Letters,2016-01-01,43(11).