Contrasting methane emissions from upstream and downstream rivers and their associated subtropical reservoir in eastern China

Abstract Subtropical reservoirs are an important source of atmospheric methane (CH4). This study investigated the spatiotemporal variability of bubble and diffusive CH4 emissions from a subtropical reservoir, including its upstream and downstream rivers, in eastern China. There was no obvious season...

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Autor principal:	Le Yang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ea8e7aa65d824659b68fcde4c32f9049
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spelling	oai:doaj.org-article:ea8e7aa65d824659b68fcde4c32f90492021-12-02T15:09:42ZContrasting methane emissions from upstream and downstream rivers and their associated subtropical reservoir in eastern China10.1038/s41598-019-44470-22045-2322https://doaj.org/article/ea8e7aa65d824659b68fcde4c32f90492019-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-44470-2https://doaj.org/toc/2045-2322Abstract Subtropical reservoirs are an important source of atmospheric methane (CH4). This study investigated the spatiotemporal variability of bubble and diffusive CH4 emissions from a subtropical reservoir, including its upstream and downstream rivers, in eastern China. There was no obvious seasonal variation in CH4 emissions from the main reservoir, which increased slightly from the first half year to the next half year. In the upstream river, CH4 emissions were low from February to June and fluctuated widely from July to January due to bubble activity. In the downstream river, CH4 emissions were lowest in February, which was possibly influenced by the low streamflow rate from the reservoir (275 m3 s−1) and a short period of mixing. There was spatial variability in CH4 emissions, where fluxes were highest from the upstream river (3.65 ± 3.24 mg CH4 m−2 h−1) and lowest from the main reservoir (0.082 ± 0.061 mg CH4 m−2 h−1), and emissions from the downstream river were 0.49 ± 0.20 mg CH4 m−2 h−1. Inflow rivers are hot spots in bubble CH4 emissions that should be examined using field-sampling strategies. This study will improve the accuracy of current and future estimations of CH4 emissions from hydroelectric systems and will help guide mitigation strategies for greenhouse gas emissions.Le YangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-10 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Le Yang Contrasting methane emissions from upstream and downstream rivers and their associated subtropical reservoir in eastern China
description	Abstract Subtropical reservoirs are an important source of atmospheric methane (CH4). This study investigated the spatiotemporal variability of bubble and diffusive CH4 emissions from a subtropical reservoir, including its upstream and downstream rivers, in eastern China. There was no obvious seasonal variation in CH4 emissions from the main reservoir, which increased slightly from the first half year to the next half year. In the upstream river, CH4 emissions were low from February to June and fluctuated widely from July to January due to bubble activity. In the downstream river, CH4 emissions were lowest in February, which was possibly influenced by the low streamflow rate from the reservoir (275 m3 s−1) and a short period of mixing. There was spatial variability in CH4 emissions, where fluxes were highest from the upstream river (3.65 ± 3.24 mg CH4 m−2 h−1) and lowest from the main reservoir (0.082 ± 0.061 mg CH4 m−2 h−1), and emissions from the downstream river were 0.49 ± 0.20 mg CH4 m−2 h−1. Inflow rivers are hot spots in bubble CH4 emissions that should be examined using field-sampling strategies. This study will improve the accuracy of current and future estimations of CH4 emissions from hydroelectric systems and will help guide mitigation strategies for greenhouse gas emissions.
format	article
author	Le Yang
author_facet	Le Yang
author_sort	Le Yang
title	Contrasting methane emissions from upstream and downstream rivers and their associated subtropical reservoir in eastern China
title_short	Contrasting methane emissions from upstream and downstream rivers and their associated subtropical reservoir in eastern China
title_full	Contrasting methane emissions from upstream and downstream rivers and their associated subtropical reservoir in eastern China
title_fullStr	Contrasting methane emissions from upstream and downstream rivers and their associated subtropical reservoir in eastern China
title_full_unstemmed	Contrasting methane emissions from upstream and downstream rivers and their associated subtropical reservoir in eastern China
title_sort	contrasting methane emissions from upstream and downstream rivers and their associated subtropical reservoir in eastern china
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/ea8e7aa65d824659b68fcde4c32f9049
work_keys_str_mv	AT leyang contrastingmethaneemissionsfromupstreamanddownstreamriversandtheirassociatedsubtropicalreservoirineasternchina
_version_	1718387787921620992

Contrasting methane emissions from upstream and downstream rivers and their associated subtropical reservoir in eastern China

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