Trends in dissolved organic carbon in UK rivers and lakes

被引:214
作者
Worrall, F
Harriman, R
Evans, CD
Watts, CD
Adamson, J
Neal, C
Tipping, E
Burt, T
Grieve, I
Monteith, D
Naden, PS
Nisbet, T
Reynolds, B
Stevens, P
机构
[1] Univ Durham, Sci Labs, Dept Earth Sci, Durham DH1 3LE, England
[2] Freshwater Lab, Pitlochry PH16 5LB, Perthshire, Scotland
[3] Univ Coll N Wales, Ctr Ecol & Hydrol, Bangor LL57 2UP, Gwynedd, Wales
[4] Ctr Ecol & Hydrol, Wallingford OX10 8BB, Oxon, England
[5] Ctr Ecol & Hydrol, Environm Change Network, Grange Over Sands LA11 6JU, Cumbria, England
[6] Ctr Ecol & Hydrol, Ambleside LA22 0LP, Cumbria, England
[7] Univ Stirling, Dept Environm Sci, Stirling FK9 4LA, Scotland
[8] UCL, Environm Change Res Ctr, London WC1H 0AP, England
[9] Forest Res, Farnham GU10 4LH, Surrey, England
关键词
climate change; DOC; lakes; rivers; trends;
D O I
10.1007/s10533-004-8131-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Several studies have highlighted an increase in DOC concentration in streams and lakes of UK upland catchments though the causal mechanisms controlling the increase have yet to be fully explained. This study, compiles a comprehensive data set of DOC concentration records for UK catchments to evaluate trends and test whether observed increases are ubiquitous over time and space. The study analysed monthly DOC time series from 198 sites, including 29 lakes, 8 water supply reservoirs and 161 rivers. The records vary in length from 8 to 42 years going back as far as 1961. Of the 198 sites, 153 (77%) show an upward trend in DOC concentration significant at the 95% level, the remaining 45 (23%) show no significant trend and no sites show a significant decrease in DOC concentration. The average annual increase in DOC concentration was 0.17 mg C/l/year. The dataset shows: (i) a spatial consistent upward trend in the DOC concentration independent of regional effects of rainfall, acid and nitrogen deposition, and local effects of land-use change; (ii) a temporally consistent increase in DOC concentration for period back as far as the 1960s; (iii) the increase in DOC concentration means an estimated DOC flux from the UK as 0.86 Mt C for the year 2002 and is increasing at 0.02 Mt C/year. Possible reasons for the increasing DOC concentration are discussed.
引用
收藏
页码:369 / 402
页数:34
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