Dissolved organic matter sources in large Arctic rivers
The biomarker composition of dissolved organic carbon (DOC) of the six largest Arctic rivers was studied between 2003 and 2007 as part of the PARTNERS Project. Samples were collected over seasonal cycles relatively close to the river mouths. Here we report the lignin phenol and p-hydroxybenzene comp...
Published in: | Geochimica et Cosmochimica Acta |
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2012
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Online Access: | https://pure.au.dk/portal/da/publications/dissolved-organic-matter-sources-in-large-arctic-rivers(9a0a2bba-fe48-43cb-817b-567783fd22f0).html https://doi.org/10.1016/j.gca.2012.07.015 http://www.scopus.com/inward/record.url?scp=84865343450&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/9a0a2bba-fe48-43cb-817b-567783fd22f0 2023-05-15T14:26:49+02:00 Dissolved organic matter sources in large Arctic rivers Amon, R.M.W. Duan, S. Louchouarn, P. Rinehart, A.J. Walker, S.A. Prokushkin, A. Guggenberger, G. Bauch, D. Stedmon, C. Raymond, P.A. Holmes, R.M. McClelland, J.W. Peterson, B.J. Zhulidov, A.V. 2012 https://pure.au.dk/portal/da/publications/dissolved-organic-matter-sources-in-large-arctic-rivers(9a0a2bba-fe48-43cb-817b-567783fd22f0).html https://doi.org/10.1016/j.gca.2012.07.015 http://www.scopus.com/inward/record.url?scp=84865343450&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Amon , R M W , Duan , S , Louchouarn , P , Rinehart , A J , Walker , S A , Prokushkin , A , Guggenberger , G , Bauch , D , Stedmon , C , Raymond , P A , Holmes , R M , McClelland , J W , Peterson , B J & Zhulidov , A V 2012 , ' Dissolved organic matter sources in large Arctic rivers ' , Geochimica et Cosmochimica Acta , vol. 94 , pp. 217-237 . https://doi.org/10.1016/j.gca.2012.07.015 article 2012 ftuniaarhuspubl https://doi.org/10.1016/j.gca.2012.07.015 2020-07-18T21:20:06Z The biomarker composition of dissolved organic carbon (DOC) of the six largest Arctic rivers was studied between 2003 and 2007 as part of the PARTNERS Project. Samples were collected over seasonal cycles relatively close to the river mouths. Here we report the lignin phenol and p-hydroxybenzene composition of Arctic river DOC in order to identify major sources of carbon. Arctic river DOC represents an important carbon conduit linking the large pools of organic carbon in the Arctic/Subarctic watersheds to the Arctic Ocean. Most of the annual lignin discharge (>75%) occurs during the two month of spring freshet with extremely high lignin concentrations and a lignin phenol composition indicative of fresh vegetation from boreal forests. The three large Siberian rivers, Lena, Yenisei, and Ob, which also have the highest proportion of forests within their watersheds, contribute about 90% of the total lignin discharge to the Arctic Ocean. The composition of river DOC is also characterized by elevated levels of p-hydroxybenzenes, particularly during the low flow season, which indicates a larger contribution from mosses and peat bogs. The lignin composition was strongly related to the average C-age of DOC supporting the abundance of young, boreal-vegetation-derived leachates during spring flood, and older, soil-, peat-, and wetland-derived DOC during groundwater dominated low flow conditions, particularly in the Ob and Yukon Rivers. We observed significant differences in DOC concentration and composition between the rivers over the seasonal cycles with the Mackenzie River being the most unique, the Lena River being similar to the Yenisei, and the Yukon being most similar to the Ob. The observed relationship between the lignin phenol composition and watershed characteristics suggests that DOC discharge from these rivers could increase in a warmer climate under otherwise undisturbed conditions. Article in Journal/Newspaper Arctic Arctic Arctic Ocean lena river Mackenzie river Subarctic Yukon Aarhus University: Research Arctic Arctic Ocean Mackenzie River Yukon Geochimica et Cosmochimica Acta 94 217 237 |
institution |
Open Polar |
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Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
description |
The biomarker composition of dissolved organic carbon (DOC) of the six largest Arctic rivers was studied between 2003 and 2007 as part of the PARTNERS Project. Samples were collected over seasonal cycles relatively close to the river mouths. Here we report the lignin phenol and p-hydroxybenzene composition of Arctic river DOC in order to identify major sources of carbon. Arctic river DOC represents an important carbon conduit linking the large pools of organic carbon in the Arctic/Subarctic watersheds to the Arctic Ocean. Most of the annual lignin discharge (>75%) occurs during the two month of spring freshet with extremely high lignin concentrations and a lignin phenol composition indicative of fresh vegetation from boreal forests. The three large Siberian rivers, Lena, Yenisei, and Ob, which also have the highest proportion of forests within their watersheds, contribute about 90% of the total lignin discharge to the Arctic Ocean. The composition of river DOC is also characterized by elevated levels of p-hydroxybenzenes, particularly during the low flow season, which indicates a larger contribution from mosses and peat bogs. The lignin composition was strongly related to the average C-age of DOC supporting the abundance of young, boreal-vegetation-derived leachates during spring flood, and older, soil-, peat-, and wetland-derived DOC during groundwater dominated low flow conditions, particularly in the Ob and Yukon Rivers. We observed significant differences in DOC concentration and composition between the rivers over the seasonal cycles with the Mackenzie River being the most unique, the Lena River being similar to the Yenisei, and the Yukon being most similar to the Ob. The observed relationship between the lignin phenol composition and watershed characteristics suggests that DOC discharge from these rivers could increase in a warmer climate under otherwise undisturbed conditions. |
format |
Article in Journal/Newspaper |
author |
Amon, R.M.W. Duan, S. Louchouarn, P. Rinehart, A.J. Walker, S.A. Prokushkin, A. Guggenberger, G. Bauch, D. Stedmon, C. Raymond, P.A. Holmes, R.M. McClelland, J.W. Peterson, B.J. Zhulidov, A.V. |
spellingShingle |
Amon, R.M.W. Duan, S. Louchouarn, P. Rinehart, A.J. Walker, S.A. Prokushkin, A. Guggenberger, G. Bauch, D. Stedmon, C. Raymond, P.A. Holmes, R.M. McClelland, J.W. Peterson, B.J. Zhulidov, A.V. Dissolved organic matter sources in large Arctic rivers |
author_facet |
Amon, R.M.W. Duan, S. Louchouarn, P. Rinehart, A.J. Walker, S.A. Prokushkin, A. Guggenberger, G. Bauch, D. Stedmon, C. Raymond, P.A. Holmes, R.M. McClelland, J.W. Peterson, B.J. Zhulidov, A.V. |
author_sort |
Amon, R.M.W. |
title |
Dissolved organic matter sources in large Arctic rivers |
title_short |
Dissolved organic matter sources in large Arctic rivers |
title_full |
Dissolved organic matter sources in large Arctic rivers |
title_fullStr |
Dissolved organic matter sources in large Arctic rivers |
title_full_unstemmed |
Dissolved organic matter sources in large Arctic rivers |
title_sort |
dissolved organic matter sources in large arctic rivers |
publishDate |
2012 |
url |
https://pure.au.dk/portal/da/publications/dissolved-organic-matter-sources-in-large-arctic-rivers(9a0a2bba-fe48-43cb-817b-567783fd22f0).html https://doi.org/10.1016/j.gca.2012.07.015 http://www.scopus.com/inward/record.url?scp=84865343450&partnerID=8YFLogxK |
geographic |
Arctic Arctic Ocean Mackenzie River Yukon |
geographic_facet |
Arctic Arctic Ocean Mackenzie River Yukon |
genre |
Arctic Arctic Arctic Ocean lena river Mackenzie river Subarctic Yukon |
genre_facet |
Arctic Arctic Arctic Ocean lena river Mackenzie river Subarctic Yukon |
op_source |
Amon , R M W , Duan , S , Louchouarn , P , Rinehart , A J , Walker , S A , Prokushkin , A , Guggenberger , G , Bauch , D , Stedmon , C , Raymond , P A , Holmes , R M , McClelland , J W , Peterson , B J & Zhulidov , A V 2012 , ' Dissolved organic matter sources in large Arctic rivers ' , Geochimica et Cosmochimica Acta , vol. 94 , pp. 217-237 . https://doi.org/10.1016/j.gca.2012.07.015 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.gca.2012.07.015 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
94 |
container_start_page |
217 |
op_container_end_page |
237 |
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1766300251027668992 |