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Aged dissolved organic carbon exported from rivers of the Tibetan Plateau

The role played by river networks in regional and global carbon cycle is receiving increasing attention. Despite the potential of radiocarbon measurements ((14)C) to elucidate sources and cycling of different riverine carbon pools, there remain large regions such as the climate-sensitive Tibetan Pla...

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Autores principales: Qu, Bin, Sillanpää, Mika, Li, Chaoliu, Kang, Shichang, Stubbins, Aron, Yan, Fangping, Aho, Kelly Sue, Zhou, Feng, Raymond, Peter A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5446113/
https://www.ncbi.nlm.nih.gov/pubmed/28552976
http://dx.doi.org/10.1371/journal.pone.0178166
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author Qu, Bin
Sillanpää, Mika
Li, Chaoliu
Kang, Shichang
Stubbins, Aron
Yan, Fangping
Aho, Kelly Sue
Zhou, Feng
Raymond, Peter A.
author_facet Qu, Bin
Sillanpää, Mika
Li, Chaoliu
Kang, Shichang
Stubbins, Aron
Yan, Fangping
Aho, Kelly Sue
Zhou, Feng
Raymond, Peter A.
author_sort Qu, Bin
collection PubMed
description The role played by river networks in regional and global carbon cycle is receiving increasing attention. Despite the potential of radiocarbon measurements ((14)C) to elucidate sources and cycling of different riverine carbon pools, there remain large regions such as the climate-sensitive Tibetan Plateau for which no data are available. Here we provide new (14)C data on dissolved organic carbon (DOC) from three large Asian rivers (the Yellow, Yangtze and Yarlung Tsangpo Rivers) running on the Tibetan Plateau and present the carbon transportation pattern in rivers of the plateau versus other river system in the world. Despite higher discharge rates during the high flow season, the DOC yield of Tibetan Plateau rivers (0.41 gC m(-2) yr(-1)) was lower than most other rivers due to lower concentrations. Radiocarbon ages of the DOC were older/more depleted (511±294 years before present, yr BP) in the Tibetan rivers than those in Arctic and tropical rivers. A positive correlation between radiocarbon age and permafrost watershed coverage was observed, indicating that (14)C-deplted/old carbon is exported from permafrost regions of the Tibetan Plateau during periods of high flow. This is in sharp contrast to permafrost regions of the Arctic which export (14)C-enriched carbon during high discharge periods.
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spelling pubmed-54461132017-06-12 Aged dissolved organic carbon exported from rivers of the Tibetan Plateau Qu, Bin Sillanpää, Mika Li, Chaoliu Kang, Shichang Stubbins, Aron Yan, Fangping Aho, Kelly Sue Zhou, Feng Raymond, Peter A. PLoS One Research Article The role played by river networks in regional and global carbon cycle is receiving increasing attention. Despite the potential of radiocarbon measurements ((14)C) to elucidate sources and cycling of different riverine carbon pools, there remain large regions such as the climate-sensitive Tibetan Plateau for which no data are available. Here we provide new (14)C data on dissolved organic carbon (DOC) from three large Asian rivers (the Yellow, Yangtze and Yarlung Tsangpo Rivers) running on the Tibetan Plateau and present the carbon transportation pattern in rivers of the plateau versus other river system in the world. Despite higher discharge rates during the high flow season, the DOC yield of Tibetan Plateau rivers (0.41 gC m(-2) yr(-1)) was lower than most other rivers due to lower concentrations. Radiocarbon ages of the DOC were older/more depleted (511±294 years before present, yr BP) in the Tibetan rivers than those in Arctic and tropical rivers. A positive correlation between radiocarbon age and permafrost watershed coverage was observed, indicating that (14)C-deplted/old carbon is exported from permafrost regions of the Tibetan Plateau during periods of high flow. This is in sharp contrast to permafrost regions of the Arctic which export (14)C-enriched carbon during high discharge periods. Public Library of Science 2017-05-26 /pmc/articles/PMC5446113/ /pubmed/28552976 http://dx.doi.org/10.1371/journal.pone.0178166 Text en © 2017 Qu et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Qu, Bin
Sillanpää, Mika
Li, Chaoliu
Kang, Shichang
Stubbins, Aron
Yan, Fangping
Aho, Kelly Sue
Zhou, Feng
Raymond, Peter A.
Aged dissolved organic carbon exported from rivers of the Tibetan Plateau
title Aged dissolved organic carbon exported from rivers of the Tibetan Plateau
title_full Aged dissolved organic carbon exported from rivers of the Tibetan Plateau
title_fullStr Aged dissolved organic carbon exported from rivers of the Tibetan Plateau
title_full_unstemmed Aged dissolved organic carbon exported from rivers of the Tibetan Plateau
title_short Aged dissolved organic carbon exported from rivers of the Tibetan Plateau
title_sort aged dissolved organic carbon exported from rivers of the tibetan plateau
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5446113/
https://www.ncbi.nlm.nih.gov/pubmed/28552976
http://dx.doi.org/10.1371/journal.pone.0178166
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