DOI: 10.1002/2013GB004764
Scopus记录号: 2-s2.0-84902306086
论文题名: Influences of glacier melt and permafrost thaw on the age of dissolved organic carbon in the Yukon River basin
作者: Aiken G ; R ; , Spencer R ; G ; M ; , Striegl R ; G ; , Schuster P ; F ; , Raymond P ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 5 起始页码: 525
结束页码: 537
语种: 英语
英文关键词: dissolved organic matter
; glaciers
; hydrology
; permafrost
; Yukon River basin
Scopus关键词: Biological materials
; Carbon
; Climate change
; Glacial geology
; Glaciers
; Groundwater
; Hydrology
; Rivers
; Soil moisture
; Stream flow
; Thawing
; Watersheds
; Dissolved organic carbon
; Dissolved organic matters
; Glacial meltwater
; Groundwater sources
; Long-term effects
; Permafrost thaws
; Streams draining
; Yukon River basins
; Permafrost
; carbon cycle
; dissolved organic carbon
; nutrient enrichment
; permafrost
; river basin
; seasonal variation
; Yukon Basin
英文摘要: Responses of near-surface permafrost and glacial ice to climate change are of particular significance for understanding long-term effects on global carbon cycling and carbon export by high-latitude northern rivers. Here we report Δ14C-dissolved organic carbon (DOC) values and dissolved organic matter optical data for the Yukon River, 15 tributaries of the Yukon River, glacial meltwater, and groundwater and soil water end-member sources draining to the Yukon River, with the goal of assessing mobilization of aged DOC within the watershed. Ancient DOC was associated with glacial meltwater and groundwater sources. In contrast, DOC from watersheds dominated by peat soils and underlain by permafrost was typically enriched in Δ14C indicating that degradation of ancient carbon stores is currently not occurring at large enough scales to quantitatively influence bulk DOC exports from those landscapes. On an annual basis, DOC exported was predominantly modern during the spring period throughout the Yukon River basin and became older through summer-fall and winter periods, suggesting that contributions of older DOC from soils, glacial meltwaters, and groundwater are significant during these months. Our data indicate that rapidly receding glaciers and increasing groundwater inputs will likely result in greater contributions of older DOC in the Yukon River and its tributaries in coming decades. Key Points Oldest DOC found in glacial meltwater and groundwater dominated systems Streams draining peat soils underlain by permafrost enriched in modern carbon Old carbon from thawing permafrost soils not apparent in DOC data at this time ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77498
Appears in Collections: 气候变化事实与影响
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作者单位: U.S. Geological Survey, Boulder CO, United States; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee FL, United States; Yale School of Forestry and Environmental Studies, Yale University, New Haven CT, United States
Recommended Citation:
Aiken G,R,, Spencer R,et al. Influences of glacier melt and permafrost thaw on the age of dissolved organic carbon in the Yukon River basin[J]. Global Biogeochemical Cycles,2014-01-01,28(5)