Fluvial carbon dioxide emission from the Lena River basin during spring flood

Greenhouse gas (GHG) emissions from inland waters of permafrost-affected regions is one of the key factor of circumpolar aquatic ecosystem response to climate warming and permafrost thaw. Riverine systems of central and eastern Siberia contribute a significant part of the water and carbon (C) export...

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Main Authors: Vorobyev, Sergey N., Karlsson, Jan, Kolesnichenko, Yuri Y., Koretz, Mikhail, Pokrovsky, Oleg S.
Format: Text
Language:English
Published: 2021
Subjects:
Ice
Online Access:https://doi.org/10.5194/bg-2021-109
https://bg.copernicus.org/preprints/bg-2021-109/
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spelling ftcopernicus:oai:publications.copernicus.org:bgd94261 2023-05-15T15:03:34+02:00 Fluvial carbon dioxide emission from the Lena River basin during spring flood Vorobyev, Sergey N. Karlsson, Jan Kolesnichenko, Yuri Y. Koretz, Mikhail Pokrovsky, Oleg S. 2021-05-06 application/pdf https://doi.org/10.5194/bg-2021-109 https://bg.copernicus.org/preprints/bg-2021-109/ eng eng doi:10.5194/bg-2021-109 https://bg.copernicus.org/preprints/bg-2021-109/ eISSN: 1726-4189 Text 2021 ftcopernicus https://doi.org/10.5194/bg-2021-109 2021-05-10T16:22:15Z Greenhouse gas (GHG) emissions from inland waters of permafrost-affected regions is one of the key factor of circumpolar aquatic ecosystem response to climate warming and permafrost thaw. Riverine systems of central and eastern Siberia contribute a significant part of the water and carbon (C) export to the Arctic Ocean, yet their C exchange with the atmosphere remain poorly known due to lack of in-situ GHG concentration and emission estimates. Here we present the results of continuous in-situ pCO 2 measurements over a 2600-km transect of the Lena River main stem and lower reaches of 20 major tributaries (together representing watershed area of 1,661,000 km 2 , 66 % of the Lena’s basin), conducted at the peak of the spring flood. The pCO 2 in Lena (range 400–1400 µatm) and tributaries (range 400–1600 µatm) was oversaturated and remained generally stable (within ca. 20 %) over the night/day period and across the river channels. The pCO 2 in tributaries increased northward with mean annual temperature decrease and permafrost increase; this change was positively correlated with C stock in soil and the proportion of deciduous needle-leaf forest and riparian vegetation. Based on gas transfer coefficients obtained from rivers of the Siberian permafrost zone, we calculated CO 2 emission for the main stem and tributaries. Typical fluxes ranged from 1 to 2 g C m −2 d −1 (> 99 % CO 2 , < 1 % CH 4 ) which is comparable with CO 2 emission measured in Kolyma, Yukon and Mackenzie and permafrost-affected rivers in western Siberia. The areal C emissions from lotic waters of the Lena watershed were quantified via taking into account the total area of permanent and seasonal water of the Lena basin (28,000 km 2 ). Assuming 6 months of the year of open water period and no emission under ice, the annual C emissions from the whole Lena basin range from 5 to 10 Tg C yr −1 , which is comparable to the DOC and DIC lateral export to the Arctic Ocean. Text Arctic Arctic Ocean Ice lena river permafrost Siberia Yukon Copernicus Publications: E-Journals Arctic Arctic Ocean Kolyma ENVELOPE(161.000,161.000,69.500,69.500) Yukon
institution Open Polar
collection Copernicus Publications: E-Journals
op_collection_id ftcopernicus
language English
description Greenhouse gas (GHG) emissions from inland waters of permafrost-affected regions is one of the key factor of circumpolar aquatic ecosystem response to climate warming and permafrost thaw. Riverine systems of central and eastern Siberia contribute a significant part of the water and carbon (C) export to the Arctic Ocean, yet their C exchange with the atmosphere remain poorly known due to lack of in-situ GHG concentration and emission estimates. Here we present the results of continuous in-situ pCO 2 measurements over a 2600-km transect of the Lena River main stem and lower reaches of 20 major tributaries (together representing watershed area of 1,661,000 km 2 , 66 % of the Lena’s basin), conducted at the peak of the spring flood. The pCO 2 in Lena (range 400–1400 µatm) and tributaries (range 400–1600 µatm) was oversaturated and remained generally stable (within ca. 20 %) over the night/day period and across the river channels. The pCO 2 in tributaries increased northward with mean annual temperature decrease and permafrost increase; this change was positively correlated with C stock in soil and the proportion of deciduous needle-leaf forest and riparian vegetation. Based on gas transfer coefficients obtained from rivers of the Siberian permafrost zone, we calculated CO 2 emission for the main stem and tributaries. Typical fluxes ranged from 1 to 2 g C m −2 d −1 (> 99 % CO 2 , < 1 % CH 4 ) which is comparable with CO 2 emission measured in Kolyma, Yukon and Mackenzie and permafrost-affected rivers in western Siberia. The areal C emissions from lotic waters of the Lena watershed were quantified via taking into account the total area of permanent and seasonal water of the Lena basin (28,000 km 2 ). Assuming 6 months of the year of open water period and no emission under ice, the annual C emissions from the whole Lena basin range from 5 to 10 Tg C yr −1 , which is comparable to the DOC and DIC lateral export to the Arctic Ocean.
format Text
author Vorobyev, Sergey N.
Karlsson, Jan
Kolesnichenko, Yuri Y.
Koretz, Mikhail
Pokrovsky, Oleg S.
spellingShingle Vorobyev, Sergey N.
Karlsson, Jan
Kolesnichenko, Yuri Y.
Koretz, Mikhail
Pokrovsky, Oleg S.
Fluvial carbon dioxide emission from the Lena River basin during spring flood
author_facet Vorobyev, Sergey N.
Karlsson, Jan
Kolesnichenko, Yuri Y.
Koretz, Mikhail
Pokrovsky, Oleg S.
author_sort Vorobyev, Sergey N.
title Fluvial carbon dioxide emission from the Lena River basin during spring flood
title_short Fluvial carbon dioxide emission from the Lena River basin during spring flood
title_full Fluvial carbon dioxide emission from the Lena River basin during spring flood
title_fullStr Fluvial carbon dioxide emission from the Lena River basin during spring flood
title_full_unstemmed Fluvial carbon dioxide emission from the Lena River basin during spring flood
title_sort fluvial carbon dioxide emission from the lena river basin during spring flood
publishDate 2021
url https://doi.org/10.5194/bg-2021-109
https://bg.copernicus.org/preprints/bg-2021-109/
long_lat ENVELOPE(161.000,161.000,69.500,69.500)
geographic Arctic
Arctic Ocean
Kolyma
Yukon
geographic_facet Arctic
Arctic Ocean
Kolyma
Yukon
genre Arctic
Arctic Ocean
Ice
lena river
permafrost
Siberia
Yukon
genre_facet Arctic
Arctic Ocean
Ice
lena river
permafrost
Siberia
Yukon
op_source eISSN: 1726-4189
op_relation doi:10.5194/bg-2021-109
https://bg.copernicus.org/preprints/bg-2021-109/
op_doi https://doi.org/10.5194/bg-2021-109
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