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Organic Geochemistry of Cape Bounty Sediments

Metadata

File Identifier: 11714_iso.xml
Metadata Language: eng; CAN
: utf8
Resource Type: Dataset
Responsible Party: Individual Name: Polar Data Catalogue Organisation Name: Canadian Cryospheric Information Network Role: Point Of Contact Contact Info: Voice: (519) 888-4567 x32689 Street Address: 200 University Avenue West, University of Waterloo City: Waterloo Province/State: Ontario Postal Code/ZIP: N2L 3G1 Country: Canada E-Mail Address: pdc@uwaterloo.ca
Metadata Date: 2013-05-28
Metadata Standard Name: North American Profile of ISO 19115:2003
Metadata Standard Version: 2009-01-01

Data Identification

Abstract: Higher average temperatures in the Arctic have generated instability in permafrost causing active layer detachments (ALDs), translocating organic matter (OM) to more biologically active areas of the biogeosphere. Previous studies noted increased microbial activity in soils collected from recent ALDs. The current study uses biomarkers and 13C solid-state nuclear magnetic resonance (NMR) to evaluate OM composition and biogeochemistry in fluvial sediments receiving ALD inputs. Channel sediment was collected from the main stream, headwaters, and tributary streams running through recent ALDs within the Cape Bounty Arctic Watershed Observatory, Nunavut. NMR analyses show increasing concentration of alkyl and aromatic moieties along the main river channel whereas O-alkyl containing structures decreased downstream. OM in sediments running through ALDs exhibited lower aromatic NMR signals but greater O-alkyl contributions, likely due to labile OM input such as carbohydrates and peptides. Biomarker techniques also confirmed inputs originating mainly from plant-derived compounds likely released from permafrost soil OM by ALDs. OM degradation proxies revealed progressive biodegradation along the river but were notably lower in ALD sediments, again suggesting labile OM inputs from disturbed subcatchments. Microbial activity, quantified via phospholipid fatty acid biomarkers, increased in ALD tributaries but diminished rapidly downstream.
Purpose: To examine the role of permafrost active layer detachments on sediment biogeochemistry in a high arctic watershed.
Language: eng; CAN
Citation:
Contact Info: Title: Organic Geochemistry of Cape Bounty Sediments Date: Date: 2013-05-28 Date Type: Publication Date Individual Name: Myrna Simpson Role: Principal Investigator Individual Name: David Grewer Role: Individual Name: Melissa Lafreniere Role: Individual Name: Scott Lamoureux Role:
Point Of Contact:
Individual Name: Polar Data Catalogue Organisation Name: Canadian Cryospheric Information Network Role: Point Of Contact Contact Info: Voice: (519) 888-4567 x32689 Street Address: 200 University Avenue West, University of Waterloo City: Waterloo Province/State: Ontario Postal Code/ZIP: N2L 3G1 Country: Canada E-Mail Address: pdc@uwaterloo.ca Online Resource: polardata.ca
Topic Category: Environment and Conservation
Keyword Collection:
Keyword: Biogeochemistry Keyword: Biomarkers Keyword: Cape Bounty Keyword: Organic matter Keyword: Permafrost Associated Thesaurus: Polar Data Catalogue Thesaurus (Canada) Keyword: Cape Bounty Arctic Watershed Observatory, Nunavut
Spatial Extent:
West Bounding Longitude: -109 East Bounding Longitude: -109 North Bounding Latitude: 74 South Bounding Latitude: 74
Legal Constraints:
Access Constraints: Other Restrictions Use Constraints: Other Restrictions Other Constraints: Terms of Use of the Polar Data Catalogue: https://www.polardata.ca/pdcinput/public/termsofuse

Distribution

Distribution Format:
Format Name: Digital file Format Version: 1.0
Distributor:
Distributor Contact: Individual Name: Polar Data Catalogue Organisation Name: Canadian Cryospheric Information Network Role: Distributor Contact Info: Voice: (519) 888-4567 x32689 Street Address: 200 University Avenue West, University of Waterloo City: Waterloo Province/State: Ontario Postal Code/ZIP: N2L 3G1 Country: Canada E-Mail Address: pdc@uwaterloo.ca

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