Distinguishing between old and modern permafrost sources in the northeast Siberian land–shelf system with compound-specific δ2H analysis
Pleistocene ice complex permafrost deposits contain roughly a quarter of the organic carbon (OC) stored in permafrost (PF) terrain. When permafrost thaws, its OC is remobilized into the (aquatic) environment where it is available for degradation, transport or burial. Aquatic or coastal environments...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2017
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-11-1879-2017 https://noa.gwlb.de/receive/cop_mods_00009430 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00009387/tc-11-1879-2017.pdf https://tc.copernicus.org/articles/11/1879/2017/tc-11-1879-2017.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00009430 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00009430 2023-05-15T15:05:50+02:00 Distinguishing between old and modern permafrost sources in the northeast Siberian land–shelf system with compound-specific δ2H analysis Vonk, Jorien E. Tesi, Tommaso Bröder, Lisa Holmstrand, Henry Hugelius, Gustaf Andersson, August Dudarev, Oleg Semiletov, Igor Gustafsson, Örjan 2017-08 electronic https://doi.org/10.5194/tc-11-1879-2017 https://noa.gwlb.de/receive/cop_mods_00009430 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00009387/tc-11-1879-2017.pdf https://tc.copernicus.org/articles/11/1879/2017/tc-11-1879-2017.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-11-1879-2017 https://noa.gwlb.de/receive/cop_mods_00009430 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00009387/tc-11-1879-2017.pdf https://tc.copernicus.org/articles/11/1879/2017/tc-11-1879-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/tc-11-1879-2017 2022-02-08T22:57:33Z Pleistocene ice complex permafrost deposits contain roughly a quarter of the organic carbon (OC) stored in permafrost (PF) terrain. When permafrost thaws, its OC is remobilized into the (aquatic) environment where it is available for degradation, transport or burial. Aquatic or coastal environments contain sedimentary reservoirs that can serve as archives of past climatic change. As permafrost thaw is increasing throughout the Arctic, these reservoirs are important locations to assess the fate of remobilized permafrost OC. We here present compound-specific deuterium (δ2H) analysis on leaf waxes as a tool to distinguish between OC released from thawing Pleistocene permafrost (ice complex deposits; ICD) and from thawing Holocene permafrost (from near-surface soils). Bulk geochemistry (%OC; δ13C; %total nitrogen, TN) was analyzed as well as the concentrations and δ2H signatures of long-chain n-alkanes (C21 to C33) and mid- to long-chain n-alkanoic acids (C16 to C30) extracted from both ICD-PF samples (n = 9) and modern vegetation and O-horizon (topsoil-PF) samples (n = 9) from across the northeast Siberian Arctic. Results show that these topsoil-PF samples have higher %OC, higher OC ∕ TN values and more depleted δ13C-OC values than ICD-PF samples, suggesting that these former samples trace a fresher soil and/or vegetation source. Whereas the two investigated sources differ on the bulk geochemical level, they are, however, virtually indistinguishable when using leaf wax concentrations and ratios. However, on the molecular isotope level, leaf wax biomarker δ2H values are statistically different between topsoil PF and ICD PF. For example, the mean δ2H value of C29 n-alkane was −246 ± 13 ‰ (mean ± SD) for topsoil PF and −280 ± 12 ‰ for ICD PF. With a dynamic isotopic range (difference between two sources) of 34 to 50 ‰; the isotopic fingerprints of individual, abundant, biomarker molecules from leaf waxes can thus serve as endmembers to distinguish between these two sources. We tested this molecular δ2H tracer along with another source-distinguishing approach, dual-carbon (δ13C–Δ14C) isotope composition of bulk OC, for a surface sediment transect in the Laptev Sea. Results show that general offshore patterns along the shelf-slope transect are similar, but the source apportionment between the approaches vary, which may highlight the advantages of either. This study indicates that the application of δ2H leaf wax values has potential to serve as a complementary quantitative measure of the source and differential fate of OC thawed out from different permafrost compartments. Article in Journal/Newspaper Arctic Ice laptev Laptev Sea permafrost The Cryosphere Niedersächsisches Online-Archiv NOA Arctic Laptev Sea The Cryosphere 11 4 1879 1895 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Vonk, Jorien E. Tesi, Tommaso Bröder, Lisa Holmstrand, Henry Hugelius, Gustaf Andersson, August Dudarev, Oleg Semiletov, Igor Gustafsson, Örjan Distinguishing between old and modern permafrost sources in the northeast Siberian land–shelf system with compound-specific δ2H analysis |
topic_facet |
article Verlagsveröffentlichung |
description |
Pleistocene ice complex permafrost deposits contain roughly a quarter of the organic carbon (OC) stored in permafrost (PF) terrain. When permafrost thaws, its OC is remobilized into the (aquatic) environment where it is available for degradation, transport or burial. Aquatic or coastal environments contain sedimentary reservoirs that can serve as archives of past climatic change. As permafrost thaw is increasing throughout the Arctic, these reservoirs are important locations to assess the fate of remobilized permafrost OC. We here present compound-specific deuterium (δ2H) analysis on leaf waxes as a tool to distinguish between OC released from thawing Pleistocene permafrost (ice complex deposits; ICD) and from thawing Holocene permafrost (from near-surface soils). Bulk geochemistry (%OC; δ13C; %total nitrogen, TN) was analyzed as well as the concentrations and δ2H signatures of long-chain n-alkanes (C21 to C33) and mid- to long-chain n-alkanoic acids (C16 to C30) extracted from both ICD-PF samples (n = 9) and modern vegetation and O-horizon (topsoil-PF) samples (n = 9) from across the northeast Siberian Arctic. Results show that these topsoil-PF samples have higher %OC, higher OC ∕ TN values and more depleted δ13C-OC values than ICD-PF samples, suggesting that these former samples trace a fresher soil and/or vegetation source. Whereas the two investigated sources differ on the bulk geochemical level, they are, however, virtually indistinguishable when using leaf wax concentrations and ratios. However, on the molecular isotope level, leaf wax biomarker δ2H values are statistically different between topsoil PF and ICD PF. For example, the mean δ2H value of C29 n-alkane was −246 ± 13 ‰ (mean ± SD) for topsoil PF and −280 ± 12 ‰ for ICD PF. With a dynamic isotopic range (difference between two sources) of 34 to 50 ‰; the isotopic fingerprints of individual, abundant, biomarker molecules from leaf waxes can thus serve as endmembers to distinguish between these two sources. We tested this molecular δ2H tracer along with another source-distinguishing approach, dual-carbon (δ13C–Δ14C) isotope composition of bulk OC, for a surface sediment transect in the Laptev Sea. Results show that general offshore patterns along the shelf-slope transect are similar, but the source apportionment between the approaches vary, which may highlight the advantages of either. This study indicates that the application of δ2H leaf wax values has potential to serve as a complementary quantitative measure of the source and differential fate of OC thawed out from different permafrost compartments. |
format |
Article in Journal/Newspaper |
author |
Vonk, Jorien E. Tesi, Tommaso Bröder, Lisa Holmstrand, Henry Hugelius, Gustaf Andersson, August Dudarev, Oleg Semiletov, Igor Gustafsson, Örjan |
author_facet |
Vonk, Jorien E. Tesi, Tommaso Bröder, Lisa Holmstrand, Henry Hugelius, Gustaf Andersson, August Dudarev, Oleg Semiletov, Igor Gustafsson, Örjan |
author_sort |
Vonk, Jorien E. |
title |
Distinguishing between old and modern permafrost sources in the northeast Siberian land–shelf system with compound-specific δ2H analysis |
title_short |
Distinguishing between old and modern permafrost sources in the northeast Siberian land–shelf system with compound-specific δ2H analysis |
title_full |
Distinguishing between old and modern permafrost sources in the northeast Siberian land–shelf system with compound-specific δ2H analysis |
title_fullStr |
Distinguishing between old and modern permafrost sources in the northeast Siberian land–shelf system with compound-specific δ2H analysis |
title_full_unstemmed |
Distinguishing between old and modern permafrost sources in the northeast Siberian land–shelf system with compound-specific δ2H analysis |
title_sort |
distinguishing between old and modern permafrost sources in the northeast siberian land–shelf system with compound-specific δ2h analysis |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-1879-2017 https://noa.gwlb.de/receive/cop_mods_00009430 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00009387/tc-11-1879-2017.pdf https://tc.copernicus.org/articles/11/1879/2017/tc-11-1879-2017.pdf |
geographic |
Arctic Laptev Sea |
geographic_facet |
Arctic Laptev Sea |
genre |
Arctic Ice laptev Laptev Sea permafrost The Cryosphere |
genre_facet |
Arctic Ice laptev Laptev Sea permafrost The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-11-1879-2017 https://noa.gwlb.de/receive/cop_mods_00009430 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00009387/tc-11-1879-2017.pdf https://tc.copernicus.org/articles/11/1879/2017/tc-11-1879-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-11-1879-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
4 |
container_start_page |
1879 |
op_container_end_page |
1895 |
_version_ |
1766337479188676608 |