Characterizing organic matter composition in small Low and High Arctic catchments using terrestrial colored dissolved organic matter (cDOM)
Climate change is an important control of carbon cycling, particularly in the Arctic. Permafrost degradation through deeper thaw and physical disturbances result in the release of carbon dioxide and methane to the atmosphere and to an increase in riverine dissolved organic matter (DOM) fluxes. Where...
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ftzenodo:oai:zenodo.org:3237682 2023-05-15T14:29:39+02:00 Characterizing organic matter composition in small Low and High Arctic catchments using terrestrial colored dissolved organic matter (cDOM) Coch, Caroline Juhls, Bennet Lamoureux, Scott F. Lafrenière, Melissa Fritz, Michael Heim, Birgit Lantuit, Hugues 2019-01-21 https://zenodo.org/record/3237682 https://doi.org/10.5194/bg-2019-9 eng eng info:eu-repo/grantAgreement/EC/H2020/773421/ https://zenodo.org/communities/nunataryuk https://zenodo.org/record/3237682 https://doi.org/10.5194/bg-2019-9 oai:zenodo.org:3237682 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode Biogeosciences info:eu-repo/semantics/preprint publication-preprint 2019 ftzenodo https://doi.org/10.5194/bg-2019-9 2023-03-11T02:35:16Z Climate change is an important control of carbon cycling, particularly in the Arctic. Permafrost degradation through deeper thaw and physical disturbances result in the release of carbon dioxide and methane to the atmosphere and to an increase in riverine dissolved organic matter (DOM) fluxes. Whereas riverine DOM fluxes of the large Arctic rivers are well assessed, knowledge is limited with regard to small catchments that cover more than 40 % of the Arctic drainage basin. Here, we use absorption measurements to characterize changes in DOM quantity and quality in a Low Arctic (Herschel Island, Yukon, Canada) and a High Arctic (Cape Bounty, Melville Island, Nunavut, Canada) setting with regard to geographical differences, impacts of permafrost degradation and rainfall events. We find that DOM quantity and quality is controlled by differences in vegetation cover and soil organic carbon content. The Low Arctic site has higher SOCC and greater abundance of plant material introducing higher lignin concentrations into the aquatic system and resulting in a stronger color of DOM than in the High Arctic. There is a strong relationship between dissolved organic carbon (DOC) concentration and absorption characteristics (cDOM) for surface waters at both sites similar to the one for the great Arctic rivers. We used the optical characteristics of DOM such as cDOM absorption, Specific UltraViolet Absorbance SUVA, UltraViolet UV Slope, Slope Ratio for assessing quality changes downstream, at baseflow and stormflow conditions and in relation to permafrost disturbance. DOM in streams at both sites demonstrated optical signatures indicative of photodegradation downstream processes, even over short distances of 2000 m. It was determined that flow pathways and the connected hydrological residence time control DOM quality. Deeper flow pathways allow the export of permafrost-derived DOM, whereas shallow pathways with shorter residence times lead to the export of fresh near-surface derived DOM. Compared to the large Arctic rivers, DOM ... Report Arctic Cape Arctic Climate change Herschel Herschel Island Nunavut permafrost Melville Island Yukon Zenodo Arctic Canada Cape Bounty ENVELOPE(-109.542,-109.542,74.863,74.863) Herschel Island ENVELOPE(-139.089,-139.089,69.583,69.583) Nunavut Yukon |
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Open Polar |
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language |
English |
description |
Climate change is an important control of carbon cycling, particularly in the Arctic. Permafrost degradation through deeper thaw and physical disturbances result in the release of carbon dioxide and methane to the atmosphere and to an increase in riverine dissolved organic matter (DOM) fluxes. Whereas riverine DOM fluxes of the large Arctic rivers are well assessed, knowledge is limited with regard to small catchments that cover more than 40 % of the Arctic drainage basin. Here, we use absorption measurements to characterize changes in DOM quantity and quality in a Low Arctic (Herschel Island, Yukon, Canada) and a High Arctic (Cape Bounty, Melville Island, Nunavut, Canada) setting with regard to geographical differences, impacts of permafrost degradation and rainfall events. We find that DOM quantity and quality is controlled by differences in vegetation cover and soil organic carbon content. The Low Arctic site has higher SOCC and greater abundance of plant material introducing higher lignin concentrations into the aquatic system and resulting in a stronger color of DOM than in the High Arctic. There is a strong relationship between dissolved organic carbon (DOC) concentration and absorption characteristics (cDOM) for surface waters at both sites similar to the one for the great Arctic rivers. We used the optical characteristics of DOM such as cDOM absorption, Specific UltraViolet Absorbance SUVA, UltraViolet UV Slope, Slope Ratio for assessing quality changes downstream, at baseflow and stormflow conditions and in relation to permafrost disturbance. DOM in streams at both sites demonstrated optical signatures indicative of photodegradation downstream processes, even over short distances of 2000 m. It was determined that flow pathways and the connected hydrological residence time control DOM quality. Deeper flow pathways allow the export of permafrost-derived DOM, whereas shallow pathways with shorter residence times lead to the export of fresh near-surface derived DOM. Compared to the large Arctic rivers, DOM ... |
format |
Report |
author |
Coch, Caroline Juhls, Bennet Lamoureux, Scott F. Lafrenière, Melissa Fritz, Michael Heim, Birgit Lantuit, Hugues |
spellingShingle |
Coch, Caroline Juhls, Bennet Lamoureux, Scott F. Lafrenière, Melissa Fritz, Michael Heim, Birgit Lantuit, Hugues Characterizing organic matter composition in small Low and High Arctic catchments using terrestrial colored dissolved organic matter (cDOM) |
author_facet |
Coch, Caroline Juhls, Bennet Lamoureux, Scott F. Lafrenière, Melissa Fritz, Michael Heim, Birgit Lantuit, Hugues |
author_sort |
Coch, Caroline |
title |
Characterizing organic matter composition in small Low and High Arctic catchments using terrestrial colored dissolved organic matter (cDOM) |
title_short |
Characterizing organic matter composition in small Low and High Arctic catchments using terrestrial colored dissolved organic matter (cDOM) |
title_full |
Characterizing organic matter composition in small Low and High Arctic catchments using terrestrial colored dissolved organic matter (cDOM) |
title_fullStr |
Characterizing organic matter composition in small Low and High Arctic catchments using terrestrial colored dissolved organic matter (cDOM) |
title_full_unstemmed |
Characterizing organic matter composition in small Low and High Arctic catchments using terrestrial colored dissolved organic matter (cDOM) |
title_sort |
characterizing organic matter composition in small low and high arctic catchments using terrestrial colored dissolved organic matter (cdom) |
publishDate |
2019 |
url |
https://zenodo.org/record/3237682 https://doi.org/10.5194/bg-2019-9 |
long_lat |
ENVELOPE(-109.542,-109.542,74.863,74.863) ENVELOPE(-139.089,-139.089,69.583,69.583) |
geographic |
Arctic Canada Cape Bounty Herschel Island Nunavut Yukon |
geographic_facet |
Arctic Canada Cape Bounty Herschel Island Nunavut Yukon |
genre |
Arctic Cape Arctic Climate change Herschel Herschel Island Nunavut permafrost Melville Island Yukon |
genre_facet |
Arctic Cape Arctic Climate change Herschel Herschel Island Nunavut permafrost Melville Island Yukon |
op_source |
Biogeosciences |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/773421/ https://zenodo.org/communities/nunataryuk https://zenodo.org/record/3237682 https://doi.org/10.5194/bg-2019-9 oai:zenodo.org:3237682 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5194/bg-2019-9 |
_version_ |
1766303610666221568 |