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The effect of seasonal drying on sulphate dynamics in streams across southeastern Canada and the northeastern USA. 2011. Kerr,J.G.; Eimers, M.C.; Creed,I.F.; Adams, M.B.; Beall, F.; Burns,D.; Campbell, J.L.; Christopher, S. F.; Clair, T.A.; Courchesne, F.; Duchesne, L.; Fernandez, I.; Houle, D.; Jeffries, D.S.; Likens, G.E.; Mitchell,M.J.; Shanley, J; Yao,H. Biogeochemistry.
Available from the Journal's Web site. †
DOI: 10.1007/s10533-011-9664-1
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Abstract
Within the southeast Canada and northeast USA region, apeak insulphate (S042~) 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 S042~ response to seasonal drying is widespread across the broader region, or to what extent the level of response varies among catchments. In our study, S042~ 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< Q25). AS042~ response