Dissolved organic carbon trends resulting from changes in atmospheric deposition chemistry (original) (raw)

Nature volume 450, pages 537–540 (2007) Cite this article

Abstract

Several hypotheses have been proposed to explain recent, widespread increases in concentrations of dissolved organic carbon (DOC) in the surface waters of glaciated landscapes across eastern North America and northern and central Europe1,2,3. Some invoke anthropogenic forcing through mechanisms related to climate change3,4,5, nitrogen deposition6 or changes in land use7, and by implication suggest that current concentrations and fluxes are without precedent. All of these hypotheses imply that DOC levels will continue to rise, with unpredictable consequences for the global carbon cycle. Alternatively, it has been proposed that DOC concentrations are returning toward pre-industrial levels as a result of a gradual decline in the sulphate content of atmospheric deposition8,9,10. Here we show, through the assessment of time series data from 522 remote lakes and streams in North America and northern Europe, that rising trends in DOC between 1990 and 2004 can be concisely explained by a simple model based solely on changes in deposition chemistry and catchment acid-sensitivity. We demonstrate that DOC concentrations have increased in proportion to the rates at which atmospherically deposited anthropogenic sulphur and sea salt have declined. We conclude that acid deposition to these ecosystems has been partially buffered by changes in organic acidity and that the rise in DOC is integral to recovery from acidification. Over recent decades, deposition-driven increases in organic matter solubility may have increased the export of DOC to the oceans, a potentially important component of regional carbon balances11. The increase in DOC concentrations in these regions appears unrelated to other climatic factors.

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Figure 1: Trends in dissolved organic carbon (mg l -1 yr -1).

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Figure 2: Relationship between %ΔDOC, ΔSO 4 2- and ΔCl - and the equivalent sum of ΔSO 4 2- and ΔCl - , used as surrogates for changes in atmospheric deposition.

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Figure 3: Distributions of %ΔDOC and residuals from multiple regression, by region.

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Acknowledgements

We thank the LRTAP Working Group on Effects and the EU 6th Framework Programme Euro-limpacs for support in the production and analysis of international, quality-controlled, comparable data. We also acknowledge the work of the ICP Waters Programme Centre at the Norwegian Institute of Water Research (NIVA), where the data were collated, verified and archived. The authors are indebted to many colleagues and organisations who provided data for this assessment, including: T. A. Clair, S. Couture, C. Gagnon, D. K. McNicol, R. C. Weeber, A. Paterson (Canada); J. S. Kahl, J. Kellogg, K. Roy, M. R. Hale, D. R. DeWalle (USA); the Finnish Environment Institute (SYKE) and Regional Environment Centres; the Norwegian Institute of Water Research (NIVA); the Swedish Environmental Protection Agency (Naturvårdsverket); and the UK Acid Waters Monitoring Network (supported by the Department for Environment Food and Rural Affairs) and supporting laboratories at: Fisheries Research Services, Pitlochry; Centre for Ecology and Hydrology, Wallingford; and the Environment Agency Llanelli. The information in this document has been funded in part by the US Environmental Protection Agency. It has been subjected to review by the National Health and Environmental Effects Research Laboratory, and approved for publication. Approval does not signify that the contents reflect the views of the Agency, nor does mention of trade names or commercial products constitute endorsement or recommendation for use.

Author Contributions D.T.M. and J.L.S. formulated the working hypothesis and analysed and interpreted the trend data. C.D.E. and H.A.d.W. contributed to the development of the hypothesis, assisted in the interpretation of the data, provided additional text and edited the manuscript. M.F., T.H., A.W., B.L.S., D.S.J., B.K. and J. Vuorenmaa provided data and commented on the text. J.K. provided advice and ideas on processes and contributed data from the Czech Republic (not included in the final analysis due to number and length of time series) consistent with the hypothesis. J. Vesely contributed advice, ideas and data in the early stages of development of our work.

Author information

Author notes

  1. Donald T. Monteith and John L. Stoddard: These authors contributed equally to this work.
  2. Josef Vesely: Deceased.

Authors and Affiliations

  1. Environmental Change Research Centre, UCL, London, WC1E 6BT, UK ,
    Donald T. Monteith
  2. US EPA, Corvallis, Oregon 97333, USA ,
    John L. Stoddard
  3. Centre for Ecology and Hydrology, Bangor, LL57 2UW, UK ,
    Christopher D. Evans
  4. Norwegian Institute for Water Research, N-0349 Oslo, Norway
    Heleen A. de Wit, Tore Høgåsen & Brit Lisa Skjelkvåle
  5. Finnish Environment Institute, PO Box 140, FI-00251 Helsinki, Finland ,
    Martin Forsius & Jussi Vuorenmaa
  6. Department of Environment Assessment SLU, SE-75007 Uppsala, Sweden
    Anders Wilander
  7. Environment Canada, Burlington, Ontario, L7R4A6, Canada ,
    Dean S. Jeffries
  8. Ontario Ministry of the Environment, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada ,
    Bill Keller
  9. Biology Centre, Institute of Hydrobiology, 37005 České Budějovice, Czech Republic
    Jiri Kopácek
  10. Czech Geological Survey, 152 00 Prague, Czech Republic
    Josef Vesely

Authors

  1. Donald T. Monteith
  2. John L. Stoddard
  3. Christopher D. Evans
  4. Heleen A. de Wit
  5. Martin Forsius
  6. Tore Høgåsen
  7. Anders Wilander
  8. Brit Lisa Skjelkvåle
  9. Dean S. Jeffries
  10. Jussi Vuorenmaa
  11. Bill Keller
  12. Jiri Kopácek
  13. Josef Vesely

Corresponding author

Correspondence toDonald T. Monteith.

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Monteith, D., Stoddard, J., Evans, C. et al. Dissolved organic carbon trends resulting from changes in atmospheric deposition chemistry.Nature 450, 537–540 (2007). https://doi.org/10.1038/nature06316

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Editorial Summary

Brown waters

There have been widespread reports of surface waters in many remote glaciated regions of North America and Northern Europe becoming browner as levels of dissolved organic carbon have increased. Several hypotheses have been proposed to explain the effect, including recent climate change, but the question remains controversial. A new survey of time series data from more than 500 remote lakes and streams, combined with a simple model, now shows that dissolved organic carbon concentrations are in fact closely related to the decline in the sulphate and seasalt content of atmospheric deposition. Dissolved organic carbon concentrations may therefore be returning towards levels that would have been typical prior to the first onset of acid rain during the nineteenth century.