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The significance of storms for the concentration and export of dissolved organic carbon from two Precambrian Shield catchments

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Abstract

Dissolved organic carbon (DOC) concentrations and DOC export arestudied during storms to examine the relationship between DOCconcentration and stream discharge and to assess the importance of stormson DOC export. Storms were monitored in seven subcatchments within twosmall watersheds (Harp 4--21 and Harp 3A) on the Precambrian Shield inCentral Ontario, Canada. Stream DOC concentrations increase during stormsby as much as 100% and 410% in Harp3A and Harp 4--21 respectively. The seasonal regression between DOC andstream discharge is significant in subcatchments without wetlands(r2 > 0.7) but is not significant in thetwo subcatchments with small wetland areas (r2 <0.06). On average, regressions based on weekly data yield accurate estimatesof DOC export but the variation in regressions among individual storms andthe small number of high DOC samples result in uncertainties of more than30% in DOC export. The period-weighted calculation ofDOC export from weekly data underestimates export by 14%and 22% in Harp 3A and Harp 4--21 respectively. Stormswere responsible for 57% to 68% of theDOC export in the autumn and 29% to 40%of the DOC export in the spring. A single large storm accounted for31% of the autumn DOC export in Harp 3A. The importanceof individual storms for DOC export and the variation in the relationshipbetween DOC and stream discharge among storms make it difficult to predictthe effects of climate change on DOC export and DOC concentrations.

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Authors and Affiliations

  1. Waterloo Centre for Groundwater Research, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada

    M.J. Hinton & S.L. Schiff

  2. Geography Department, Wilfrid Laurier University, Waterloo, Ontario, N2L 3C5, Canada

    M.C. English

Authors
  1. M.J. Hinton
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  2. S.L. Schiff
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  3. M.C. English
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Hinton, M., Schiff, S. & English, M. The significance of storms for the concentration and export of dissolved organic carbon from two Precambrian Shield catchments. Biogeochemistry 36, 67–88 (1997). https://doi.org/10.1023/A:1005779711821

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