Global carbon budget of reservoirs is overturned by the quantification of drawdown areas

Reservoir drawdown areas¿where sediment is exposed to the atmosphere due to water-level fluctuations¿are hotspots for carbon dioxide (CO2) emissions. However, the global extent of drawdown areas is unknown, precluding an accurate assessment of the carbon budget of reservoirs. Here we show, on the ba...

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Autores: Keller, Philipp S., Marcé Romero, Rafael, Obrador Sala, Biel, Koschorreck, Matthias
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2021
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositório:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/218223
Acesso em linha:https://hdl.handle.net/2445/218223
Access Level:Acceso aberto
Palavra-chave:Pantans (Enginyeria civil)
Diòxid de carboni
Reservoirs
Carbon dioxide
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spelling Global carbon budget of reservoirs is overturned by the quantification of drawdown areasKeller, Philipp S.Marcé Romero, RafaelObrador Sala, BielKoschorreck, MatthiasPantans (Enginyeria civil)Diòxid de carboniReservoirsCarbon dioxideReservoir drawdown areas¿where sediment is exposed to the atmosphere due to water-level fluctuations¿are hotspots for carbon dioxide (CO2) emissions. However, the global extent of drawdown areas is unknown, precluding an accurate assessment of the carbon budget of reservoirs. Here we show, on the basis of satellite observations of 6,794 reservoirs between 1985 and 2015, that 15% of the global reservoir area was dry. Exposure of drawdown areas was most pronounced in reservoirs close to the tropics and shows a complex dependence on climatic (precipitation, temperature) and anthropogenic (water use) drivers. We re-assessed the global carbon emissions from reservoirs by apportioning CO2 and methane emissions to water surfaces and drawdown areas using published areal emission rates. The new estimate assigns 26.2 (15-40) (95% confidence interval) TgCO2-C yr−1 to drawdown areas, and increases current global CO2 emissions from reservoirs by 53% (60.3 (43.2-79.5) TgCO2-C yr−1). Taking into account drawdown areas, the ratio between carbon emissions and carbon burial in sediments is 2.02 (1.04-4.26). This suggests that reservoirs emit more carbon than they bury, challenging the current understanding that reservoirs are net carbon sinks. Thus, consideration of drawdown areas overturns our conception of the role of reservoirs in the carbon cycle.Nature Publishing Group2025202520212025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion7 p.application/pdfapplication/pdfhttps://hdl.handle.net/2445/218223Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1038/s41561-021-00734-zNature Geoscience, 2021, vol. 14, num.6, p. 402-408https://doi.org/10.1038/s41561-021-00734-zcc-by (c) Keller, Philipp S. et al., 2021http://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:recercat.cat:2445/2182232026-05-29T05:05:01Z
dc.title.none.fl_str_mv Global carbon budget of reservoirs is overturned by the quantification of drawdown areas
title Global carbon budget of reservoirs is overturned by the quantification of drawdown areas
spellingShingle Global carbon budget of reservoirs is overturned by the quantification of drawdown areas
Keller, Philipp S.
Pantans (Enginyeria civil)
Diòxid de carboni
Reservoirs
Carbon dioxide
title_short Global carbon budget of reservoirs is overturned by the quantification of drawdown areas
title_full Global carbon budget of reservoirs is overturned by the quantification of drawdown areas
title_fullStr Global carbon budget of reservoirs is overturned by the quantification of drawdown areas
title_full_unstemmed Global carbon budget of reservoirs is overturned by the quantification of drawdown areas
title_sort Global carbon budget of reservoirs is overturned by the quantification of drawdown areas
dc.creator.none.fl_str_mv Keller, Philipp S.
Marcé Romero, Rafael
Obrador Sala, Biel
Koschorreck, Matthias
author Keller, Philipp S.
author_facet Keller, Philipp S.
Marcé Romero, Rafael
Obrador Sala, Biel
Koschorreck, Matthias
author_role author
author2 Marcé Romero, Rafael
Obrador Sala, Biel
Koschorreck, Matthias
author2_role author
author
author
dc.subject.none.fl_str_mv Pantans (Enginyeria civil)
Diòxid de carboni
Reservoirs
Carbon dioxide
topic Pantans (Enginyeria civil)
Diòxid de carboni
Reservoirs
Carbon dioxide
description Reservoir drawdown areas¿where sediment is exposed to the atmosphere due to water-level fluctuations¿are hotspots for carbon dioxide (CO2) emissions. However, the global extent of drawdown areas is unknown, precluding an accurate assessment of the carbon budget of reservoirs. Here we show, on the basis of satellite observations of 6,794 reservoirs between 1985 and 2015, that 15% of the global reservoir area was dry. Exposure of drawdown areas was most pronounced in reservoirs close to the tropics and shows a complex dependence on climatic (precipitation, temperature) and anthropogenic (water use) drivers. We re-assessed the global carbon emissions from reservoirs by apportioning CO2 and methane emissions to water surfaces and drawdown areas using published areal emission rates. The new estimate assigns 26.2 (15-40) (95% confidence interval) TgCO2-C yr−1 to drawdown areas, and increases current global CO2 emissions from reservoirs by 53% (60.3 (43.2-79.5) TgCO2-C yr−1). Taking into account drawdown areas, the ratio between carbon emissions and carbon burial in sediments is 2.02 (1.04-4.26). This suggests that reservoirs emit more carbon than they bury, challenging the current understanding that reservoirs are net carbon sinks. Thus, consideration of drawdown areas overturns our conception of the role of reservoirs in the carbon cycle.
publishDate 2021
dc.date.none.fl_str_mv 2021
2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/218223
url https://hdl.handle.net/2445/218223
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1038/s41561-021-00734-z
Nature Geoscience, 2021, vol. 14, num.6, p. 402-408
https://doi.org/10.1038/s41561-021-00734-z
dc.rights.none.fl_str_mv cc-by (c) Keller, Philipp S. et al., 2021
http://creativecommons.org/licenses/by/3.0/es/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Keller, Philipp S. et al., 2021
http://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 7 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Nature Publishing Group
publisher.none.fl_str_mv Nature Publishing Group
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812455

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