Nitrogen Transport and Connectivity in two Wetland-Rich Boreal sites in the Athabasca Oil Sands Region, Canada
Development of the Athabasca Oil Sands Region (AOSR) has increased atmospheric nitrogen emissions, a trend which is expected to increase in the future. The area surrounding development is comprised of Boreal upland forests and peatlands. Improved understanding of the hydrological connectivity betwee...
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ftuvicpubl:oai:dspace.library.uvic.ca:1828/7036 2023-05-15T16:17:37+02:00 Nitrogen Transport and Connectivity in two Wetland-Rich Boreal sites in the Athabasca Oil Sands Region, Canada Cherry, Mikaela Gibson, John J. Birks, S. Jean 2015 application/pdf http://hdl.handle.net/1828/7036 English en eng http://hdl.handle.net/1828/7036 Available to the World Wide Web Wetland Isotope hydrology Nitrogen transport Thesis 2015 ftuvicpubl 2022-05-19T06:10:38Z Development of the Athabasca Oil Sands Region (AOSR) has increased atmospheric nitrogen emissions, a trend which is expected to increase in the future. The area surrounding development is comprised of Boreal upland forests and peatlands. Improved understanding of the hydrological connectivity between Boreal peatlands and uplands is needed to predict the fate and transport of atmospheric N deposited across the region. Two field sites: Jack Pine High (JPH, located 45 km north of Fort McMurray) and Mariana Lakes (ML, located 100 km south of Fort McMurray) were instrumented with piezometers nests and water table wells for this study (n= 108 sampling locations). The wells were placed along transects that cover target landscape units (bog, fen, upland). Wells were sampled for water isotopes and geochemical parameters during the summers of 2011-2014 to characterize the baseline geochemistry of groundwater in the different landscape units. Inorganic (nitrate, ammonium) and organic forms of nitrogen (dissolved organic nitrogen), major and minor ions and water isotope tracers (18O, 2H and 3H) were measured to identify the various forms of nitrogen in the different landscape units, as well as to assess connectivity and potential for nitrogen transport between the different units. At JPH surface and groundwater flow is from the uplands to the fen. There was little (<0.1-1.5 mg/L) nitrate, ammonium, or dissolved organic nitrate (DON) found throughout JPH. At ML nitrogen concentrations were higher (<0.1-30 mg/l) and concentrations of ammonium and DON increased at depths throughout ML. The distribution of 3H with depth within the peatland reveals limited connectivity between the peat and underlying mineral soils. Tritium sampling at ML indicates that at some locations the wetland residence time is greater than 50 years. Nitrogen movement out of peatlands may take longer due to conversions and storage. At ML nitrogen (NH4 and DON) is produced and stored at depth in the wetlands. At JPH higher nitrogen concentrations are ... Thesis Fort McMurray University of Victoria (Canada): UVicDSpace Canada Fort McMurray |
institution |
Open Polar |
collection |
University of Victoria (Canada): UVicDSpace |
op_collection_id |
ftuvicpubl |
language |
English |
topic |
Wetland Isotope hydrology Nitrogen transport |
spellingShingle |
Wetland Isotope hydrology Nitrogen transport Cherry, Mikaela Nitrogen Transport and Connectivity in two Wetland-Rich Boreal sites in the Athabasca Oil Sands Region, Canada |
topic_facet |
Wetland Isotope hydrology Nitrogen transport |
description |
Development of the Athabasca Oil Sands Region (AOSR) has increased atmospheric nitrogen emissions, a trend which is expected to increase in the future. The area surrounding development is comprised of Boreal upland forests and peatlands. Improved understanding of the hydrological connectivity between Boreal peatlands and uplands is needed to predict the fate and transport of atmospheric N deposited across the region. Two field sites: Jack Pine High (JPH, located 45 km north of Fort McMurray) and Mariana Lakes (ML, located 100 km south of Fort McMurray) were instrumented with piezometers nests and water table wells for this study (n= 108 sampling locations). The wells were placed along transects that cover target landscape units (bog, fen, upland). Wells were sampled for water isotopes and geochemical parameters during the summers of 2011-2014 to characterize the baseline geochemistry of groundwater in the different landscape units. Inorganic (nitrate, ammonium) and organic forms of nitrogen (dissolved organic nitrogen), major and minor ions and water isotope tracers (18O, 2H and 3H) were measured to identify the various forms of nitrogen in the different landscape units, as well as to assess connectivity and potential for nitrogen transport between the different units. At JPH surface and groundwater flow is from the uplands to the fen. There was little (<0.1-1.5 mg/L) nitrate, ammonium, or dissolved organic nitrate (DON) found throughout JPH. At ML nitrogen concentrations were higher (<0.1-30 mg/l) and concentrations of ammonium and DON increased at depths throughout ML. The distribution of 3H with depth within the peatland reveals limited connectivity between the peat and underlying mineral soils. Tritium sampling at ML indicates that at some locations the wetland residence time is greater than 50 years. Nitrogen movement out of peatlands may take longer due to conversions and storage. At ML nitrogen (NH4 and DON) is produced and stored at depth in the wetlands. At JPH higher nitrogen concentrations are ... |
author2 |
Gibson, John J. Birks, S. Jean |
format |
Thesis |
author |
Cherry, Mikaela |
author_facet |
Cherry, Mikaela |
author_sort |
Cherry, Mikaela |
title |
Nitrogen Transport and Connectivity in two Wetland-Rich Boreal sites in the Athabasca Oil Sands Region, Canada |
title_short |
Nitrogen Transport and Connectivity in two Wetland-Rich Boreal sites in the Athabasca Oil Sands Region, Canada |
title_full |
Nitrogen Transport and Connectivity in two Wetland-Rich Boreal sites in the Athabasca Oil Sands Region, Canada |
title_fullStr |
Nitrogen Transport and Connectivity in two Wetland-Rich Boreal sites in the Athabasca Oil Sands Region, Canada |
title_full_unstemmed |
Nitrogen Transport and Connectivity in two Wetland-Rich Boreal sites in the Athabasca Oil Sands Region, Canada |
title_sort |
nitrogen transport and connectivity in two wetland-rich boreal sites in the athabasca oil sands region, canada |
publishDate |
2015 |
url |
http://hdl.handle.net/1828/7036 |
geographic |
Canada Fort McMurray |
geographic_facet |
Canada Fort McMurray |
genre |
Fort McMurray |
genre_facet |
Fort McMurray |
op_relation |
http://hdl.handle.net/1828/7036 |
op_rights |
Available to the World Wide Web |
_version_ |
1766003508607188992 |