Stable isotope (carbon, hydrogen) variation in plants and lake surface sediments from northwestern Canada

Hydrogen isotope ratios of leaf waxes are used to reconstruct past hydroclimate because they are correlated to meteoric/growth water hydrogen isotopes. The interpretation of these signatures from ancient sedimentary archives relies on a thorough understanding of the drivers of modern isotope variabi...

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Main Authors: Lattaud, Julie, Haghipour, Negar, Eglinton, Timothy I., Broeder, Lisa
Format: Conference Object
Language:English
Published: Copernicus 2021
Subjects:
Online Access:https://hdl.handle.net/20.500.11850/521302
https://doi.org/10.3929/ethz-b-000521302
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spelling ftethz:oai:www.research-collection.ethz.ch:20.500.11850/521302 2023-05-15T15:14:50+02:00 Stable isotope (carbon, hydrogen) variation in plants and lake surface sediments from northwestern Canada Lattaud, Julie Haghipour, Negar Eglinton, Timothy I. Broeder, Lisa 2021 application/application/pdf https://hdl.handle.net/20.500.11850/521302 https://doi.org/10.3929/ethz-b-000521302 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-8245 http://hdl.handle.net/20.500.11850/521302 doi:10.3929/ethz-b-000521302 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY EGUsphere info:eu-repo/semantics/conferenceObject info:eu-repo/semantics/publishedVersion 2021 ftethz https://doi.org/20.500.11850/521302 https://doi.org/10.3929/ethz-b-000521302 https://doi.org/10.5194/egusphere-egu21-8245 2023-02-13T00:58:17Z Hydrogen isotope ratios of leaf waxes are used to reconstruct past hydroclimate because they are correlated to meteoric/growth water hydrogen isotopes. The interpretation of these signatures from ancient sedimentary archives relies on a thorough understanding of the drivers of modern isotope variability. Studies in the high latitudes, regions that are particularly valuable in light of their vulnerability to rapid climate change, are scarce. We studied modern vegetation (22 plants) in two areas in the Northwestern Territories (Canada): Herschel Island and Peel Plateau, to understand the stable isotope variability found in plants of Arctic regions. Bulk biomass stable carbon isotope and radiocarbon composition have been measured as well as fatty acids (wax lipids coating the plant leaves) stable carbon and hydrogen isotopes. Furthermore, lake surface sediments and river bank sediments from the Mackenzie River Delta (surrounded by the same plants) have been similarly studied. Bulk carbon isotope composition of the plants show strong difference between plant type, i.e. herbs, shrubs, lichen and moss, as shown in previous studies. Whereas the commonly used average chain length (ACL) is not useful to differentiate the plants. In term of compound-specific isotope ratios, herbs are generally 2H-enriched in comparison to shrubs as shown in other regions of the world, and the C28 fatty acid present the most differences amongst plant type (from ~ -207‰ for herbs to ~ – 240‰ for shrubs). No major difference between the areas is noted indicating that the ~ 250 km (Herschel Island 69.5⁰N and Peel Plateau 67.3⁰N) have no impact on the hydrogen isotope composition of the fatty acids. As such we decided to compare the plant with the lake surface sediments (from the Mackenzie Delta, located between Herschel Island and the Peel Plateau). Short-chain fatty acids, sourced from organisms growing in the lake, from isolated lakes shows 2H-enriched isotopic values indicating the effect of increased evaporation in the lake during summer ... Conference Object Arctic Climate change Herschel Island Mackenzie Delta Mackenzie river ETH Zürich Research Collection Arctic Canada Herschel Island ENVELOPE(-139.089,-139.089,69.583,69.583) Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Mackenzie River
institution Open Polar
collection ETH Zürich Research Collection
op_collection_id ftethz
language English
description Hydrogen isotope ratios of leaf waxes are used to reconstruct past hydroclimate because they are correlated to meteoric/growth water hydrogen isotopes. The interpretation of these signatures from ancient sedimentary archives relies on a thorough understanding of the drivers of modern isotope variability. Studies in the high latitudes, regions that are particularly valuable in light of their vulnerability to rapid climate change, are scarce. We studied modern vegetation (22 plants) in two areas in the Northwestern Territories (Canada): Herschel Island and Peel Plateau, to understand the stable isotope variability found in plants of Arctic regions. Bulk biomass stable carbon isotope and radiocarbon composition have been measured as well as fatty acids (wax lipids coating the plant leaves) stable carbon and hydrogen isotopes. Furthermore, lake surface sediments and river bank sediments from the Mackenzie River Delta (surrounded by the same plants) have been similarly studied. Bulk carbon isotope composition of the plants show strong difference between plant type, i.e. herbs, shrubs, lichen and moss, as shown in previous studies. Whereas the commonly used average chain length (ACL) is not useful to differentiate the plants. In term of compound-specific isotope ratios, herbs are generally 2H-enriched in comparison to shrubs as shown in other regions of the world, and the C28 fatty acid present the most differences amongst plant type (from ~ -207‰ for herbs to ~ – 240‰ for shrubs). No major difference between the areas is noted indicating that the ~ 250 km (Herschel Island 69.5⁰N and Peel Plateau 67.3⁰N) have no impact on the hydrogen isotope composition of the fatty acids. As such we decided to compare the plant with the lake surface sediments (from the Mackenzie Delta, located between Herschel Island and the Peel Plateau). Short-chain fatty acids, sourced from organisms growing in the lake, from isolated lakes shows 2H-enriched isotopic values indicating the effect of increased evaporation in the lake during summer ...
format Conference Object
author Lattaud, Julie
Haghipour, Negar
Eglinton, Timothy I.
Broeder, Lisa
spellingShingle Lattaud, Julie
Haghipour, Negar
Eglinton, Timothy I.
Broeder, Lisa
Stable isotope (carbon, hydrogen) variation in plants and lake surface sediments from northwestern Canada
author_facet Lattaud, Julie
Haghipour, Negar
Eglinton, Timothy I.
Broeder, Lisa
author_sort Lattaud, Julie
title Stable isotope (carbon, hydrogen) variation in plants and lake surface sediments from northwestern Canada
title_short Stable isotope (carbon, hydrogen) variation in plants and lake surface sediments from northwestern Canada
title_full Stable isotope (carbon, hydrogen) variation in plants and lake surface sediments from northwestern Canada
title_fullStr Stable isotope (carbon, hydrogen) variation in plants and lake surface sediments from northwestern Canada
title_full_unstemmed Stable isotope (carbon, hydrogen) variation in plants and lake surface sediments from northwestern Canada
title_sort stable isotope (carbon, hydrogen) variation in plants and lake surface sediments from northwestern canada
publisher Copernicus
publishDate 2021
url https://hdl.handle.net/20.500.11850/521302
https://doi.org/10.3929/ethz-b-000521302
long_lat ENVELOPE(-139.089,-139.089,69.583,69.583)
ENVELOPE(-136.672,-136.672,68.833,68.833)
geographic Arctic
Canada
Herschel Island
Mackenzie Delta
Mackenzie River
geographic_facet Arctic
Canada
Herschel Island
Mackenzie Delta
Mackenzie River
genre Arctic
Climate change
Herschel Island
Mackenzie Delta
Mackenzie river
genre_facet Arctic
Climate change
Herschel Island
Mackenzie Delta
Mackenzie river
op_source EGUsphere
op_relation info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu21-8245
http://hdl.handle.net/20.500.11850/521302
doi:10.3929/ethz-b-000521302
op_rights info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International
op_rightsnorm CC-BY
op_doi https://doi.org/20.500.11850/521302
https://doi.org/10.3929/ethz-b-000521302
https://doi.org/10.5194/egusphere-egu21-8245
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