DOI: 10.1002/2016GB005539
Scopus记录号: 2-s2.0-85021220146
论文题名: No long-term trends in pCO2 despite increasing organic carbon concentrations in boreal lakes, streams, and rivers
作者: Nydahl A ; C ; , Wallin M ; B ; , Weyhenmeyer G ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 6 起始页码: 985
结束页码: 995
语种: 英语
英文关键词: carbon dioxide
; dissolved organic matter
; freshwater
; hydrology
; inland water
Scopus关键词: carbon cycle
; carbon dioxide
; carbon emission
; concentration (composition)
; dissolved organic carbon
; flushing
; freshwater environment
; groundwater
; groundwater flow
; groundwater-surface water interaction
; hydrology
; lacustrine environment
; organic carbon
; partial pressure
; river basin
; runoff
; stream
; surface water
; Sweden
英文摘要: Concentrations of dissolved organic carbon (DOC) from terrestrial sources have been increasing in freshwaters across large parts of the boreal region. According to results from large-scale field and detailed laboratory studies, such a DOC increase could potentially stimulate carbon dioxide (CO2) production, subsequently increasing the partial pressure of CO2 (pCO2) in freshwaters. However, the response of pCO2 to the presently observed long-term increase in DOC in freshwaters is still unknown. Here we tested whether the commonly found spatial DOC-pCO2 relationship is also valid on a temporal scale. Analyzing time series of water chemical data from 71 lakes, 30 streams, and 4 river mouths distributed across all of Sweden over a 17 year period, we observed significant DOC concentration increases in 39 lakes, 15 streams, and 4 river mouths. Significant pCO2 increases were, however, only observed in six of these 58 waters, indicating that long-term DOC increases in Swedish waters are disconnected from temporal pCO2 trends. We suggest that the uncoupling of trends in DOC concentration and pCO2 are a result of increased surface water runoff. When surface water runoff increases, there is likely less CO2 relative to DOC imported from soils into waters due to a changed balance between surface and groundwater flow. Additionally, increased surface water runoff causes faster water flushing through the landscape giving less time for in situ CO2 production in freshwaters. We conclude that pCO2 is presently not following DOC concentration trends, which has important implications for modeling future CO2 emissions from boreal waters. ©2017. 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/77729
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Ecology and Genetics, Limnology, Uppsala University, Uppsala, Sweden; Department of Earth Sciences, Air Water and Landscape Sciences, Uppsala University, Uppsala, Sweden
Recommended Citation:
Nydahl A,C,, Wallin M,et al. No long-term trends in pCO2 despite increasing organic carbon concentrations in boreal lakes, streams, and rivers[J]. Global Biogeochemical Cycles,2017-01-01,31(6)