Potential Shifts in Canadian High Arctic Sedimentary Organic Matter Composition With Permafrost Active Layer Detachments
Increased temperature and precipitation in Arctic regions have led to deeper thawing and structural instability in permafrost soil. The resulting localized disturbances, referred to as active layer detachments (ALDs), may transport organic matter (OM) to more biogeochemically active zones. To examin...
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ftqueensuniv:oai:qspace.library.queensu.ca:1974/14596 2023-05-15T14:54:19+02:00 Potential Shifts in Canadian High Arctic Sedimentary Organic Matter Composition With Permafrost Active Layer Detachments Grewer, David M. Lafrenière, Melissa J. Lamoureux, Scott F. Simpson, Myrna J. 2016-06-20T15:54:22Z http://hdl.handle.net/1974/14596 en eng 0146-6380 http://hdl.handle.net/1974/14596 Biomarkers Solid state 13 C NMR Fluvial Transport River Sediment Organic Matter Biogeochemistry journal article 2016 ftqueensuniv 2020-12-29T09:08:52Z Increased temperature and precipitation in Arctic regions have led to deeper thawing and structural instability in permafrost soil. The resulting localized disturbances, referred to as active layer detachments (ALDs), may transport organic matter (OM) to more biogeochemically active zones. To examine this further, solid state cross polarization magic angle spinning 13C nuclear magnetic resonance (CPMAS NMR) and biomarker analysis were used to evaluate potential shifts in riverine sediment OM composition due to nearby ALDs within the Cape Bounty Arctic Watershed Observatory, Nunavut, Canada. In sedimentary OM near ALDs, NMR analysis revealed signals indicative of unaltered plant-derived material, likely derived from permafrost. Long chain acyclic aliphatic lipids, steroids, cutin, suberin and lignin occurred in the sediments, consistent with a dominance of plant-derived compounds, some of which may have originated from permafrost-derived OM released by ALDs. OM degradation proxies for sediments near ALDs revealed less alteration in acyclic aliphatic lipids, while constituents such as steroids, cutin, suberin and lignin were found at a relatively advanced stage of degradation. Phospholipid fatty acid analysis indicated that microbial activity was higher near ALDs than downstream but microbial substrate limitation was prevalent within disturbed regions. Our study suggests that, as these systems recover from disturbance, ALDs likely provide permafrost-derived OM to sedimentary environments. This source of OM, which is enriched in labile OM, may alter biogeochemical patterns and enhance microbial respiration within these ecosystems. Article in Journal/Newspaper Arctic Nunavut permafrost Queen's University, Ontario: QSpace Arctic Canada Cape Bounty ENVELOPE(-109.542,-109.542,74.863,74.863) Nunavut |
institution |
Open Polar |
collection |
Queen's University, Ontario: QSpace |
op_collection_id |
ftqueensuniv |
language |
English |
topic |
Biomarkers Solid state 13 C NMR Fluvial Transport River Sediment Organic Matter Biogeochemistry |
spellingShingle |
Biomarkers Solid state 13 C NMR Fluvial Transport River Sediment Organic Matter Biogeochemistry Grewer, David M. Lafrenière, Melissa J. Lamoureux, Scott F. Simpson, Myrna J. Potential Shifts in Canadian High Arctic Sedimentary Organic Matter Composition With Permafrost Active Layer Detachments |
topic_facet |
Biomarkers Solid state 13 C NMR Fluvial Transport River Sediment Organic Matter Biogeochemistry |
description |
Increased temperature and precipitation in Arctic regions have led to deeper thawing and structural instability in permafrost soil. The resulting localized disturbances, referred to as active layer detachments (ALDs), may transport organic matter (OM) to more biogeochemically active zones. To examine this further, solid state cross polarization magic angle spinning 13C nuclear magnetic resonance (CPMAS NMR) and biomarker analysis were used to evaluate potential shifts in riverine sediment OM composition due to nearby ALDs within the Cape Bounty Arctic Watershed Observatory, Nunavut, Canada. In sedimentary OM near ALDs, NMR analysis revealed signals indicative of unaltered plant-derived material, likely derived from permafrost. Long chain acyclic aliphatic lipids, steroids, cutin, suberin and lignin occurred in the sediments, consistent with a dominance of plant-derived compounds, some of which may have originated from permafrost-derived OM released by ALDs. OM degradation proxies for sediments near ALDs revealed less alteration in acyclic aliphatic lipids, while constituents such as steroids, cutin, suberin and lignin were found at a relatively advanced stage of degradation. Phospholipid fatty acid analysis indicated that microbial activity was higher near ALDs than downstream but microbial substrate limitation was prevalent within disturbed regions. Our study suggests that, as these systems recover from disturbance, ALDs likely provide permafrost-derived OM to sedimentary environments. This source of OM, which is enriched in labile OM, may alter biogeochemical patterns and enhance microbial respiration within these ecosystems. |
format |
Article in Journal/Newspaper |
author |
Grewer, David M. Lafrenière, Melissa J. Lamoureux, Scott F. Simpson, Myrna J. |
author_facet |
Grewer, David M. Lafrenière, Melissa J. Lamoureux, Scott F. Simpson, Myrna J. |
author_sort |
Grewer, David M. |
title |
Potential Shifts in Canadian High Arctic Sedimentary Organic Matter Composition With Permafrost Active Layer Detachments |
title_short |
Potential Shifts in Canadian High Arctic Sedimentary Organic Matter Composition With Permafrost Active Layer Detachments |
title_full |
Potential Shifts in Canadian High Arctic Sedimentary Organic Matter Composition With Permafrost Active Layer Detachments |
title_fullStr |
Potential Shifts in Canadian High Arctic Sedimentary Organic Matter Composition With Permafrost Active Layer Detachments |
title_full_unstemmed |
Potential Shifts in Canadian High Arctic Sedimentary Organic Matter Composition With Permafrost Active Layer Detachments |
title_sort |
potential shifts in canadian high arctic sedimentary organic matter composition with permafrost active layer detachments |
publishDate |
2016 |
url |
http://hdl.handle.net/1974/14596 |
long_lat |
ENVELOPE(-109.542,-109.542,74.863,74.863) |
geographic |
Arctic Canada Cape Bounty Nunavut |
geographic_facet |
Arctic Canada Cape Bounty Nunavut |
genre |
Arctic Nunavut permafrost |
genre_facet |
Arctic Nunavut permafrost |
op_relation |
0146-6380 http://hdl.handle.net/1974/14596 |
_version_ |
1766326024273920000 |