Stable Water Isotope Assessment of Tundra Wetland Hydrology as a Potential Source of Arctic Riverine Dissolved Organic Carbon in the Indigirka River Lowland, Northeastern Siberia

Arctic tundra wetlands may be an important source of dissolved organic carbon (DOC) in Arctic rivers and the Arctic Ocean under global warming. We investigated stable water isotopes and DOC concentration in wetlands, tributaries, and the mainstream at the lower reaches of the Indigirka River in nort...

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Published in:Frontiers in Earth Science
Main Authors: Shinya Takano, Youhei Yamashita, Shunsuke Tei, Maochang Liang, Ryo Shingubara, Tomoki Morozumi, Trofim C. Maximov, Atsuko Sugimoto
Format: Article in Journal/Newspaper
Language:English
Published: Frontiers Media S.A. 2021
Subjects:
Q
Online Access:https://doi.org/10.3389/feart.2021.699365
https://doaj.org/article/f9dcff8852ac438f8203d533159e0147
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spelling ftdoajarticles:oai:doaj.org/article:f9dcff8852ac438f8203d533159e0147 2023-05-15T14:40:06+02:00 Stable Water Isotope Assessment of Tundra Wetland Hydrology as a Potential Source of Arctic Riverine Dissolved Organic Carbon in the Indigirka River Lowland, Northeastern Siberia Shinya Takano Youhei Yamashita Shunsuke Tei Maochang Liang Ryo Shingubara Tomoki Morozumi Trofim C. Maximov Atsuko Sugimoto 2021-07-01T00:00:00Z https://doi.org/10.3389/feart.2021.699365 https://doaj.org/article/f9dcff8852ac438f8203d533159e0147 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2021.699365/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2021.699365 https://doaj.org/article/f9dcff8852ac438f8203d533159e0147 Frontiers in Earth Science, Vol 9 (2021) Arctic tundra wetland riverine dissolved organic carbon wetland hydrology stable water isotopes Northeastern siberia Science Q article 2021 ftdoajarticles https://doi.org/10.3389/feart.2021.699365 2022-12-31T10:14:04Z Arctic tundra wetlands may be an important source of dissolved organic carbon (DOC) in Arctic rivers and the Arctic Ocean under global warming. We investigated stable water isotopes and DOC concentration in wetlands, tributaries, and the mainstream at the lower reaches of the Indigirka River in northeastern Siberia during the summers of 2010–2014 to assess the complex hydrology and role of wetlands as sources of riverine DOC. The wetlands had higher values of δ18O and DOC concentration than the tributaries and mainstream of the Indigirka River. A relationship between the two parameters was observed in the wetlands, tributaries, and mainstream, suggesting the wetlands can be a source of DOC for the mainstream through the tributaries. The combined temporal variations in riverine δ18O and DOC concentration indicate the mainstream water flowed into the tributaries during relatively high river-level periods in summer, whereas high DOC water in the downstream wetlands could be discharged to the mainstream through the tributaries during the low river-level periods. A minor fraction (7–13%) of riverine and wetland DOC was degraded during 40 days of dark incubation. Overall, the downstream wetlands potentially provide relatively less biodegradable DOC to the Arctic river and costal ecosystem during the low river-level periods—from late summer to autumn. Article in Journal/Newspaper Arctic Arctic Ocean Global warming Tundra Siberia Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Indigirka ENVELOPE(149.609,149.609,70.929,70.929) Frontiers in Earth Science 9
institution Open Polar
collection Directory of Open Access Journals: DOAJ Articles
op_collection_id ftdoajarticles
language English
topic Arctic tundra wetland
riverine dissolved organic carbon
wetland hydrology
stable water isotopes
Northeastern siberia
Science
Q
spellingShingle Arctic tundra wetland
riverine dissolved organic carbon
wetland hydrology
stable water isotopes
Northeastern siberia
Science
Q
Shinya Takano
Youhei Yamashita
Shunsuke Tei
Maochang Liang
Ryo Shingubara
Tomoki Morozumi
Trofim C. Maximov
Atsuko Sugimoto
Stable Water Isotope Assessment of Tundra Wetland Hydrology as a Potential Source of Arctic Riverine Dissolved Organic Carbon in the Indigirka River Lowland, Northeastern Siberia
topic_facet Arctic tundra wetland
riverine dissolved organic carbon
wetland hydrology
stable water isotopes
Northeastern siberia
Science
Q
description Arctic tundra wetlands may be an important source of dissolved organic carbon (DOC) in Arctic rivers and the Arctic Ocean under global warming. We investigated stable water isotopes and DOC concentration in wetlands, tributaries, and the mainstream at the lower reaches of the Indigirka River in northeastern Siberia during the summers of 2010–2014 to assess the complex hydrology and role of wetlands as sources of riverine DOC. The wetlands had higher values of δ18O and DOC concentration than the tributaries and mainstream of the Indigirka River. A relationship between the two parameters was observed in the wetlands, tributaries, and mainstream, suggesting the wetlands can be a source of DOC for the mainstream through the tributaries. The combined temporal variations in riverine δ18O and DOC concentration indicate the mainstream water flowed into the tributaries during relatively high river-level periods in summer, whereas high DOC water in the downstream wetlands could be discharged to the mainstream through the tributaries during the low river-level periods. A minor fraction (7–13%) of riverine and wetland DOC was degraded during 40 days of dark incubation. Overall, the downstream wetlands potentially provide relatively less biodegradable DOC to the Arctic river and costal ecosystem during the low river-level periods—from late summer to autumn.
format Article in Journal/Newspaper
author Shinya Takano
Youhei Yamashita
Shunsuke Tei
Maochang Liang
Ryo Shingubara
Tomoki Morozumi
Trofim C. Maximov
Atsuko Sugimoto
author_facet Shinya Takano
Youhei Yamashita
Shunsuke Tei
Maochang Liang
Ryo Shingubara
Tomoki Morozumi
Trofim C. Maximov
Atsuko Sugimoto
author_sort Shinya Takano
title Stable Water Isotope Assessment of Tundra Wetland Hydrology as a Potential Source of Arctic Riverine Dissolved Organic Carbon in the Indigirka River Lowland, Northeastern Siberia
title_short Stable Water Isotope Assessment of Tundra Wetland Hydrology as a Potential Source of Arctic Riverine Dissolved Organic Carbon in the Indigirka River Lowland, Northeastern Siberia
title_full Stable Water Isotope Assessment of Tundra Wetland Hydrology as a Potential Source of Arctic Riverine Dissolved Organic Carbon in the Indigirka River Lowland, Northeastern Siberia
title_fullStr Stable Water Isotope Assessment of Tundra Wetland Hydrology as a Potential Source of Arctic Riverine Dissolved Organic Carbon in the Indigirka River Lowland, Northeastern Siberia
title_full_unstemmed Stable Water Isotope Assessment of Tundra Wetland Hydrology as a Potential Source of Arctic Riverine Dissolved Organic Carbon in the Indigirka River Lowland, Northeastern Siberia
title_sort stable water isotope assessment of tundra wetland hydrology as a potential source of arctic riverine dissolved organic carbon in the indigirka river lowland, northeastern siberia
publisher Frontiers Media S.A.
publishDate 2021
url https://doi.org/10.3389/feart.2021.699365
https://doaj.org/article/f9dcff8852ac438f8203d533159e0147
long_lat ENVELOPE(149.609,149.609,70.929,70.929)
geographic Arctic
Arctic Ocean
Indigirka
geographic_facet Arctic
Arctic Ocean
Indigirka
genre Arctic
Arctic Ocean
Global warming
Tundra
Siberia
genre_facet Arctic
Arctic Ocean
Global warming
Tundra
Siberia
op_source Frontiers in Earth Science, Vol 9 (2021)
op_relation https://www.frontiersin.org/articles/10.3389/feart.2021.699365/full
https://doaj.org/toc/2296-6463
2296-6463
doi:10.3389/feart.2021.699365
https://doaj.org/article/f9dcff8852ac438f8203d533159e0147
op_doi https://doi.org/10.3389/feart.2021.699365
container_title Frontiers in Earth Science
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