Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/ab4fa9 |
Multiple anthropogenic drivers behind upward trends in organic carbon concentrations in boreal rivers | |
Asmala, Eero1; Carstensen, Jacob2; Raike, Antti3 | |
2019-12-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS
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ISSN | 1748-9326 |
出版年 | 2019 |
卷号 | 14期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | Finland; Denmark |
英文摘要 | Increases of riverine organic carbon concentrations have been observed across the northern hemisphere over the past few decades. These increases are the result of multiple environmental drivers, but the relative importance of the drivers is still unclear. We analyzed a dataset of >10 000 observations of riverine total organic carbon (TOC) concentrations and associated water chemistry and hydrological observations from 1993 to 2017. The observations span a ?600 km north?south gradient from 30 individual river systems in Finland. Our data show significantly increasing TOC concentrations in 25 out of 30 systems, with an average increase from 12.0 to 15.1 mg l(?1). The observed increase in riverine TOC concentrations led to an increase of 0.28 Mt in annual TOC load to the Baltic Sea from 1993 level to 2017 level. We analyzed the role of three putative environmental drivers of the observed TOC trends. Multiple regression analysis revealed that the most common driver was discharge, which alone explained TOC increases in 13 rivers, whereas pH and temperature were less important drivers (sole predictor in one and zero rivers, respectively). Different permutations of these three drivers were also found to be significant; the combination of discharge and pH being the most common (4 rivers). Land use was not in general linked with trends in TOC, except for the proportion of ditched land in the catchment, which was significantly correlated with increases in TOC concentration. Land use showed significant relationships with trends in discharge and pH. We also found that catchment characteristics are regulating the extent of these regional or global environmental changes causing the upward trends of riverine organic carbon. |
英文关键词 | total organic carbon riverine export land use ditching |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000499327600001 |
WOS关键词 | LAND-USE ; CLIMATE-CHANGE ; FOREST LAKES ; NEW-YORK ; WATER ; EXPORT ; SOILS ; ACIDIFICATION ; TEMPERATURE ; INCREASES |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/224722 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.Univ Helsinki, Tvarminne Zool Stn, Hango, Finland; 2.Aarhus Univ, Dept Biosci, Roskilde, Denmark; 3.Finnish Environm Inst, Ctr Marine Res, Helsinki, Finland |
推荐引用方式 GB/T 7714 | Asmala, Eero,Carstensen, Jacob,Raike, Antti. Multiple anthropogenic drivers behind upward trends in organic carbon concentrations in boreal rivers[J]. ENVIRONMENTAL RESEARCH LETTERS,2019,14(12). |
APA | Asmala, Eero,Carstensen, Jacob,&Raike, Antti.(2019).Multiple anthropogenic drivers behind upward trends in organic carbon concentrations in boreal rivers.ENVIRONMENTAL RESEARCH LETTERS,14(12). |
MLA | Asmala, Eero,et al."Multiple anthropogenic drivers behind upward trends in organic carbon concentrations in boreal rivers".ENVIRONMENTAL RESEARCH LETTERS 14.12(2019). |
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