Strong legacies of emerging trends in winter precipitation on the carbon-climate feedback from Arctic tundra

Changes in winter precipitation accompanying emerging climate trends lead to a major carbon-climate feedback from Arctic tundra. However, the mechanisms driving the direction, magnitude, and form (CO2 and CH4) of C fluxes and derived climate forcing (i.e. GWP, global warming potential) from Arctic t...

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Autores: Blanc-Betes, Elena, Welker, J. M., Gómez Casanovas, Nuria, DeLucia, Evan H., Peñuelas, Josep, Oliveira, Eduardo Dias de, Gonzàlez-Meler, Miquel A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/403715
Acceso en línea:http://hdl.handle.net/10261/403715
https://api.elsevier.com/content/abstract/scopus_id/85214690186
Access Level:acceso abierto
Palabra clave:Arctic tundra
Carbon fluxes
Carbon-climate feedback
Climate change
Global warming potential
Precipitation
Snow
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spelling Strong legacies of emerging trends in winter precipitation on the carbon-climate feedback from Arctic tundraBlanc-Betes, ElenaWelker, J. M.Gómez Casanovas, NuriaDeLucia, Evan H.Peñuelas, JosepOliveira, Eduardo Dias deGonzàlez-Meler, Miquel A.Arctic tundraCarbon fluxesCarbon-climate feedbackClimate changeGlobal warming potentialPrecipitationSnowChanges in winter precipitation accompanying emerging climate trends lead to a major carbon-climate feedback from Arctic tundra. However, the mechanisms driving the direction, magnitude, and form (CO2 and CH4) of C fluxes and derived climate forcing (i.e. GWP, global warming potential) from Arctic tundra under future precipitation scenarios remain unresolved. Here, we investigated the impacts of 18 years of shallow (SS, -15-30 %) and deeper (IS, +20-45 %; DS, +70-100 %) snow depth on ecosystem C fluxes and GWP in moist acidic tundra over the growing season. The response of Arctic tundra C fluxes to snow accumulation was markedly non-linear. Both shallow- and deeper- winter snow decreased Arctic tundra CO2 emissions relative to ambient (AS), ultimately reducing ecosystem C losses over the growing season. Gross primary productivity (GPP) increased with moderate increases in snow depth and decreased with further snow accumulation closely following transitions in shrub abundance. Photosynthetic uptake, however, was tightly regulated by canopy structure and plant respiration (Raut) to GPP ratio was highly conserved despite substantial transformations of plant community across snow treatments revealing a prominent role of heterotrophic respiration (Rhet) in driving net ecosystem exchange. Consistently, ecosystem C gains responded to constraints on Rhet by temperature limitation within colder soils at SS, and by snow- and thaw-induced increases in soil-water content (SWC) that promoted anaerobic decomposition and dampened the temperature sensitivity of Rhet at IS and DS. Greater CH4 emissions from wetter soils, however, increased the global warming potential (GWP) of Arctic tundra emissions at IS and DS despite decreases in C losses. Overall, our findings indicate the potential of Arctic tussock tundra to reduce C losses over the growing season but also to significantly contribute to the ecosystem GWP under emerging trends in winter precipitation.This study was made possible by the field assistance of N Van Hoey and B. Thurnhoffer. We are grateful to the Toolik Lake Field Station staff and the CH2MHill Polar Services for their logistical support. This research was funded by the DOE, Terrestrial Ecosystem Science Program (DE-SC 0006607) awarded to MGM and JMW during the sampling period while the experiment was established, maintained initially by NSF Office of Polar Programs Award number 9321730 to JMW, and subsequent NSF Office of Polar Programs awards to JMW 9617643, 0856728, 1504141.Peer reviewedElsevierDepartment of Energy (US)National Science Foundation (US)Peñuelas, Josep [0000-0002-7215-0150]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/403715https://api.elsevier.com/content/abstract/scopus_id/85214690186reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésThe underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1016/j.scitotenv.2024.178246https://doi.org/10.1016/j.scitotenv.2024.178246Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4037152026-05-22T06:33:51Z
dc.title.none.fl_str_mv Strong legacies of emerging trends in winter precipitation on the carbon-climate feedback from Arctic tundra
title Strong legacies of emerging trends in winter precipitation on the carbon-climate feedback from Arctic tundra
spellingShingle Strong legacies of emerging trends in winter precipitation on the carbon-climate feedback from Arctic tundra
Blanc-Betes, Elena
Arctic tundra
Carbon fluxes
Carbon-climate feedback
Climate change
Global warming potential
Precipitation
Snow
title_short Strong legacies of emerging trends in winter precipitation on the carbon-climate feedback from Arctic tundra
title_full Strong legacies of emerging trends in winter precipitation on the carbon-climate feedback from Arctic tundra
title_fullStr Strong legacies of emerging trends in winter precipitation on the carbon-climate feedback from Arctic tundra
title_full_unstemmed Strong legacies of emerging trends in winter precipitation on the carbon-climate feedback from Arctic tundra
title_sort Strong legacies of emerging trends in winter precipitation on the carbon-climate feedback from Arctic tundra
dc.creator.none.fl_str_mv Blanc-Betes, Elena
Welker, J. M.
Gómez Casanovas, Nuria
DeLucia, Evan H.
Peñuelas, Josep
Oliveira, Eduardo Dias de
Gonzàlez-Meler, Miquel A.
author Blanc-Betes, Elena
author_facet Blanc-Betes, Elena
Welker, J. M.
Gómez Casanovas, Nuria
DeLucia, Evan H.
Peñuelas, Josep
Oliveira, Eduardo Dias de
Gonzàlez-Meler, Miquel A.
author_role author
author2 Welker, J. M.
Gómez Casanovas, Nuria
DeLucia, Evan H.
Peñuelas, Josep
Oliveira, Eduardo Dias de
Gonzàlez-Meler, Miquel A.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Department of Energy (US)
National Science Foundation (US)
Peñuelas, Josep [0000-0002-7215-0150]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Arctic tundra
Carbon fluxes
Carbon-climate feedback
Climate change
Global warming potential
Precipitation
Snow
topic Arctic tundra
Carbon fluxes
Carbon-climate feedback
Climate change
Global warming potential
Precipitation
Snow
description Changes in winter precipitation accompanying emerging climate trends lead to a major carbon-climate feedback from Arctic tundra. However, the mechanisms driving the direction, magnitude, and form (CO2 and CH4) of C fluxes and derived climate forcing (i.e. GWP, global warming potential) from Arctic tundra under future precipitation scenarios remain unresolved. Here, we investigated the impacts of 18 years of shallow (SS, -15-30 %) and deeper (IS, +20-45 %; DS, +70-100 %) snow depth on ecosystem C fluxes and GWP in moist acidic tundra over the growing season. The response of Arctic tundra C fluxes to snow accumulation was markedly non-linear. Both shallow- and deeper- winter snow decreased Arctic tundra CO2 emissions relative to ambient (AS), ultimately reducing ecosystem C losses over the growing season. Gross primary productivity (GPP) increased with moderate increases in snow depth and decreased with further snow accumulation closely following transitions in shrub abundance. Photosynthetic uptake, however, was tightly regulated by canopy structure and plant respiration (Raut) to GPP ratio was highly conserved despite substantial transformations of plant community across snow treatments revealing a prominent role of heterotrophic respiration (Rhet) in driving net ecosystem exchange. Consistently, ecosystem C gains responded to constraints on Rhet by temperature limitation within colder soils at SS, and by snow- and thaw-induced increases in soil-water content (SWC) that promoted anaerobic decomposition and dampened the temperature sensitivity of Rhet at IS and DS. Greater CH4 emissions from wetter soils, however, increased the global warming potential (GWP) of Arctic tundra emissions at IS and DS despite decreases in C losses. Overall, our findings indicate the potential of Arctic tussock tundra to reduce C losses over the growing season but also to significantly contribute to the ecosystem GWP under emerging trends in winter precipitation.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/403715
https://api.elsevier.com/content/abstract/scopus_id/85214690186
url http://hdl.handle.net/10261/403715
https://api.elsevier.com/content/abstract/scopus_id/85214690186
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1016/j.scitotenv.2024.178246
https://doi.org/10.1016/j.scitotenv.2024.178246
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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