Inorganic riverine freshwater tracers and water mixing identifiers in southeastern Hudson Bay
This thesis was designed to investigate the potential use of barium (Ba) concentrations as well as strontium (Sr) concentrations and Sr isotope ratios as freshwater tracers in southeastern Hudson Bay with an emphasis on the Belcher Islands. Ba concentrations ranged from 40 to 672 nM with higher conc...
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ftqueensuniv:oai:https://qspace.library.queensu.ca:1974/26470 2024-06-02T08:04:15+00:00 Inorganic riverine freshwater tracers and water mixing identifiers in southeastern Hudson Bay Creppin, Josh Chemistry Guéguen, Céline Brown, Stephen 2019-08-14T22:24:49Z application/pdf http://hdl.handle.net/1974/26470 eng eng Canadian theses http://hdl.handle.net/1974/26470 Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada ProQuest PhD and Master's Theses International Dissemination Agreement Intellectual Property Guidelines at Queen's University Copying and Preserving Your Thesis This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. freshwater tracer Ba concentration Hudson Bay Sr isotope mixing model La Grande River Great Whale River CDOM absorption Salinity 87Sr/86Sr isotope dilution thesis 2019 ftqueensuniv 2024-05-06T10:47:33Z This thesis was designed to investigate the potential use of barium (Ba) concentrations as well as strontium (Sr) concentrations and Sr isotope ratios as freshwater tracers in southeastern Hudson Bay with an emphasis on the Belcher Islands. Ba concentrations ranged from 40 to 672 nM with higher concentrations observed near river mouths in the winters of 2015-2017. This contrasts with Sr concentrations where the higher levels were found offshore (up to 105 µM). Both surface profiles and depth profiles of Ba concentrations in conjunction with coloured/chromophoric dissolved organic matter (CDOM) absorption coefficient and salinity showed clear signs of freshwater mixing in the southeastern side of the Belcher Islands sourced from nearby rivers. A three-endmember Ba mixing model was applied to determine fractions of freshwater, seawater, and sea ice melt at various sites. Based on the fraction of freshwater determined using oxygen isotope ratio, La Grande River was identified as the major source of freshwater to the Belcher Islands whereas the influence of the Great Whale River was found to be only locally important. Sr concentrations were successfully employed to identify mixing between freshwater and seawater when used in conjunction with CDOM absorption coefficients (a[355]) and salinity. 87/86Sr ratios (ranging from 0.7092 in open ocean to 0.7100-0.7340 near river mouth) were also used in a two-endmember model to assess mixing processes. The predicted 87/86Sr ratios were within 0.002% of the observed ratios in the Nelson, Winisk and Great Whale estuaries. Although the two-member model was less robust around the Belcher Islands, it found that the Great Whale river was not the main contributor in the region, confirming the Ba results. Together these results showed that both Sr and Ba can be used in a complementary fashion to other freshwater tracers (salinity, a[355], δ18O) and make for great tools in modelling freshwater fractions. However, due to their low sensitivity of freshwater detection, they should not be ... Thesis Belcher Islands Great Whale River Hudson Bay La Grande River Sea ice Queen's University, Ontario: QSpace Hudson Bay Hudson Belcher ENVELOPE(-94.172,-94.172,57.936,57.936) Belcher Islands ENVELOPE(-79.250,-79.250,56.184,56.184) Winisk ENVELOPE(-85.200,-85.200,55.267,55.267) |
institution |
Open Polar |
collection |
Queen's University, Ontario: QSpace |
op_collection_id |
ftqueensuniv |
language |
English |
topic |
freshwater tracer Ba concentration Hudson Bay Sr isotope mixing model La Grande River Great Whale River CDOM absorption Salinity 87Sr/86Sr isotope dilution |
spellingShingle |
freshwater tracer Ba concentration Hudson Bay Sr isotope mixing model La Grande River Great Whale River CDOM absorption Salinity 87Sr/86Sr isotope dilution Creppin, Josh Inorganic riverine freshwater tracers and water mixing identifiers in southeastern Hudson Bay |
topic_facet |
freshwater tracer Ba concentration Hudson Bay Sr isotope mixing model La Grande River Great Whale River CDOM absorption Salinity 87Sr/86Sr isotope dilution |
description |
This thesis was designed to investigate the potential use of barium (Ba) concentrations as well as strontium (Sr) concentrations and Sr isotope ratios as freshwater tracers in southeastern Hudson Bay with an emphasis on the Belcher Islands. Ba concentrations ranged from 40 to 672 nM with higher concentrations observed near river mouths in the winters of 2015-2017. This contrasts with Sr concentrations where the higher levels were found offshore (up to 105 µM). Both surface profiles and depth profiles of Ba concentrations in conjunction with coloured/chromophoric dissolved organic matter (CDOM) absorption coefficient and salinity showed clear signs of freshwater mixing in the southeastern side of the Belcher Islands sourced from nearby rivers. A three-endmember Ba mixing model was applied to determine fractions of freshwater, seawater, and sea ice melt at various sites. Based on the fraction of freshwater determined using oxygen isotope ratio, La Grande River was identified as the major source of freshwater to the Belcher Islands whereas the influence of the Great Whale River was found to be only locally important. Sr concentrations were successfully employed to identify mixing between freshwater and seawater when used in conjunction with CDOM absorption coefficients (a[355]) and salinity. 87/86Sr ratios (ranging from 0.7092 in open ocean to 0.7100-0.7340 near river mouth) were also used in a two-endmember model to assess mixing processes. The predicted 87/86Sr ratios were within 0.002% of the observed ratios in the Nelson, Winisk and Great Whale estuaries. Although the two-member model was less robust around the Belcher Islands, it found that the Great Whale river was not the main contributor in the region, confirming the Ba results. Together these results showed that both Sr and Ba can be used in a complementary fashion to other freshwater tracers (salinity, a[355], δ18O) and make for great tools in modelling freshwater fractions. However, due to their low sensitivity of freshwater detection, they should not be ... |
author2 |
Chemistry Guéguen, Céline Brown, Stephen |
format |
Thesis |
author |
Creppin, Josh |
author_facet |
Creppin, Josh |
author_sort |
Creppin, Josh |
title |
Inorganic riverine freshwater tracers and water mixing identifiers in southeastern Hudson Bay |
title_short |
Inorganic riverine freshwater tracers and water mixing identifiers in southeastern Hudson Bay |
title_full |
Inorganic riverine freshwater tracers and water mixing identifiers in southeastern Hudson Bay |
title_fullStr |
Inorganic riverine freshwater tracers and water mixing identifiers in southeastern Hudson Bay |
title_full_unstemmed |
Inorganic riverine freshwater tracers and water mixing identifiers in southeastern Hudson Bay |
title_sort |
inorganic riverine freshwater tracers and water mixing identifiers in southeastern hudson bay |
publishDate |
2019 |
url |
http://hdl.handle.net/1974/26470 |
long_lat |
ENVELOPE(-94.172,-94.172,57.936,57.936) ENVELOPE(-79.250,-79.250,56.184,56.184) ENVELOPE(-85.200,-85.200,55.267,55.267) |
geographic |
Hudson Bay Hudson Belcher Belcher Islands Winisk |
geographic_facet |
Hudson Bay Hudson Belcher Belcher Islands Winisk |
genre |
Belcher Islands Great Whale River Hudson Bay La Grande River Sea ice |
genre_facet |
Belcher Islands Great Whale River Hudson Bay La Grande River Sea ice |
op_relation |
Canadian theses http://hdl.handle.net/1974/26470 |
op_rights |
Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada ProQuest PhD and Master's Theses International Dissemination Agreement Intellectual Property Guidelines at Queen's University Copying and Preserving Your Thesis This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner. |
_version_ |
1800748869894537216 |