DOI: 10.1002/2013GB004770
Scopus记录号: 2-s2.0-84900798784
论文题名: Intra-annual variability of organic carbon concentrations in running waters: Drivers along a climatic gradient
作者: Winterdahl M ; , Erlandsson M ; , Futter M ; N ; , Weyhenmeyer G ; A ; , Bishop K
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 4 起始页码: 451
结束页码: 464
语种: 英语
英文关键词: climate
; DOC
; NOM
; organic matter
; seasonality
; streams
Scopus关键词: Biological materials
; Catchments
; Dynamics
; Runoff
; climate
; DOC
; NOM
; Seasonality
; streams
; Water
; annual variation
; climate effect
; concentration (composition)
; correlation
; dissolved organic carbon
; environmental gradient
; surface water
英文摘要: Trends in surface water dissolved organic carbon (DOC) concentrations have received considerable scientific interest during recent decades. However, intra-annual DOC variability is often orders of magnitude larger than long-term trends. Unraveling the controls on intra-annual DOC dynamics holds the key to a better understanding of long-term changes and their ecological significance. We quantified and characterized intra-annual DOC variability and compared it with long-term DOC trends in 136 streams and rivers, varying in size and geographical characteristics, across a 1400 km latitudinal gradient during 2000-2010. Discharge, temperature, and month of the year were the most significant predictors of intra-annual DOC variability in a majority of the running waters. Relationships between DOC, discharge, and temperature were, however, different along a mean annual temperature (MAT) gradient. Running waters with low MAT generally displayed positive DOC-discharge correlations whereas the relationships in sites with higher MAT were more variable. This reflected contrasting relationships between temperature and discharge with discharge positively correlated with temperature in cold areas, while it was negatively correlated with temperature in catchments with higher MAT. Sites where flow, temperature, and month were poorly related to intra-annual DOC dynamics were large catchments or sites with extensive upstream lake cover. DOC trends were generally much smaller than intra-annual DOC variability and did not show any north-south gradient. Our findings suggest that DOC in running waters could respond to a changing climate in ways not predictable, or even discernible, from extrapolation of recent interannual trends. Key Points Large-scale characterization of intra-annual DOC dynamics in running waters Discharge, temperature and month are significant predictors of DOC variability Shifting patterns in DOC dynamics along a 1400 km climatic gradient ©2014. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77506
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden; Department of Earth Sciences, Uppsala University, Uppsala, Sweden; Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden; Department of Geography and Environmental Science, School of Human and Environmental Sciences, University of Reading, Reading, United Kingdom; Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, Sweden
Recommended Citation:
Winterdahl M,, Erlandsson M,, Futter M,et al. Intra-annual variability of organic carbon concentrations in running waters: Drivers along a climatic gradient[J]. Global Biogeochemical Cycles,2014-01-01,28(4)