The effect of seasonal drying on sulphate dynamics in streams across southeastern Canada and the northeastern USA

Autor: S. F. Christopher, Dean S. Jeffries, Thomas A. Clair, M. C. Eimers, Jamie Shanley, Mary Beth Adams, Ivan J. Fernandez, Huaxia Yao, Luc C. Duchesne, Douglas A. Burns, Gene E. Likens, F. D. Beall, Jason Grainger Kerr, John Campbell, Daniel Houle, Irena F. Creed, Myron J. Mitchell, François Courchesne
Rok vydání: 2011
Předmět:
Zdroj: Biogeochemistry. 111:393-409
ISSN: 1573-515X
0168-2563
Popis: Within the southeast Canada and northeast USA region, a peak in sulphate (SO4 2−) concentration has been reported for some streams following periods of substantial catchment drying during the summer months (ON, Canada; VT, NH and NY, USA). However, it is currently unclear if a SO4 2− response to seasonal drying is widespread across the broader region, or to what extent the level of response varies among catchments. In our study, SO4 2− response to seasonal drying was compared in 20 catchments from 11 locations across southeastern Canada (ON, QC and NS) and northeastern USA (NH, NY, VT, WV and ME). Using long-term monitoring data of stream discharge and chemistry, the number of days for each month of the dry season (# d) when discharge (Q) was below a threshold level (25th percentile; Q25) was calculated for each catchment to give a measure of ‘seasonal dryness’ (# d Q
Databáze: OpenAIRE
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