{"id":82835,"date":"2019-01-30T12:16:35","date_gmt":"2019-01-30T17:16:35","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/effect-seasonal-drying-sulphate-dynamics\/"},"modified":"2019-01-30T12:16:35","modified_gmt":"2019-01-30T17:16:35","slug":"effect-seasonal-drying-sulphate-dynamics","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/effect-seasonal-drying-sulphate-dynamics\/","title":{"rendered":"The effect of seasonal drying on sulphate dynamics in streams across southeastern Canada and the northeastern USA"},"content":{"rendered":"\n

Published in Biogeochemistry 111: 393-409 https:\/\/doi.org\/10.1007\/s10533-011-9664-1<\/a><\/b><\/p>\n

Within the southeast Canada and northeast USA region, a peak in sulphate (SO4<\/sub>2-<\/sup>) 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<\/sub>2-<\/sup> 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<\/sub>2-<\/sup> 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<\/sub>) was calculated for each catchment to give a measure of \u2018seasonal dryness\u2019 (# d Q < Q25<\/sub>). A SO4<\/sub>2-<\/sup> response score (rs<\/em>) was then calculated for each catchment based on linear regression analysis of # d Q < Q25<\/sub> versus either the annual SO4<\/sub>2-<\/sup> concentration, or the residual of annual SO4<\/sub>2-<\/sup> concentration as a function of time (year). The final rs<\/em> values for each catchment provided an estimate of the proportion of variation in annual SO4<\/sub>2-<\/sup> concentration which could be explained by seasonal drying (possible rs<\/em> range = 0\u20131). Of the 20 catchments, 13 exhibited some level of a SO4<\/sub>2-<\/sup> response to seasonal drying (rs<\/em> = 0.04\u20130.72) with an additional two catchments exhibiting a SO4<\/sub>2-<\/sup> response for one or more seasons. SO4<\/sub>2-<\/sup> response scores were positively related to percent wetland area(w) (rs<\/em> = 1.000 – 0.978e-0.054*w<\/sup>, r2<\/sup> = 0.44) and percent saturated area (sat) (rs<\/em> = 0.481 – 0.488e-0.101*sat<\/sup>, r2<\/sup> = 0.54) indicating that wetlands\/saturated areas were an important driver of regional variation in the SO4<\/sub>2-<\/sup> response to seasonal drying. Our results suggest that any shift towards drier summers as a result of climate change could impact SO4<\/sub>2-<\/sup> dynamics in a large number of catchments throughout the region.<\/p>\n","protected":false},"excerpt":{"rendered":"

Published in Biogeochemistry 111: 393-409 https:\/\/doi.org\/10.1007\/s10533-011-9664-1 Within the southeast Canada and northeast USA region, a peak in sulphate (SO42-) 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 SO42- response to seasonal drying […]<\/p>\n","protected":false},"template":"","format":"standard","cptt_secteur":[1179],"cptt_theme":[1183,1185,1180,1181],"cptt_categ_publi":[1149],"cptt_auteurs_ministeriels":[1082,1091],"class_list":["post-82835","cpt_publication","type-cpt_publication","status-publish","format-standard","hentry","cptt_secteur-forests","cptt_theme-ecosystems-and-environment","cptt_theme-forest-ecology","cptt_theme-forestry-research","cptt_theme-forests","cptt_categ_publi-scientific-article","cptt_auteurs_ministeriels-duchesne-louis","cptt_auteurs_ministeriels-d-houle"],"acf":[],"yoast_head":"\nThe effect of seasonal drying on sulphate dynamics in streams across southeastern Canada and the northeastern USA - Minist\u00e8re des Ressources naturelles et des For\u00eats<\/title>\n<meta name=\"description\" content=\"The effect of seasonal drying on sulphate dynamics in streams across southeastern Canada and the northeastern USA was studied.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/effect-seasonal-drying-sulphate-dynamics\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The effect of seasonal drying on sulphate dynamics in streams across southeastern Canada and the northeastern USA - 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