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Consejeria de Economia, Innovacion, Ciencia y Empleo, Junta de Andalucia, Grant/Award Number: IE17_5560_EEZA, P20_00016, P18-RT-3629 and A-RNM-318-UGR18; Ministerio de Ciencia e Innovacion, Grant/ Award Number: FJC2018-038192-I, IJC2020-045630-I and MdM-2017-0714; Ministerio de Economia y Competitividad, Grant/Award Number: CGL2017-83538-C3-1-R, PID2020-117825GB-C21 and PID2020-117825GB-C22; Ministerio de Educacion, Cultura y Deporte, Grant/Award Number: FPU 14/03497

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Lopez-Ballesteros, Ana - Autor o Coautor
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Publicaciones > Artículo

Ecosystem CO2 release driven by wind occurs in drylands at global scale

Publicado en:Global Change Biology. - 2022-06-21 (), doi: 10.1111/gcb.16277

Lopez-Ballesteros, Ana;

Afiliaciones

Agrifood Res & Technol Ctr Aragon CITA, Dept Agr & Forest Syst & Environm, Zaragoza, Spain - Autor o Coautor
Andalusian Ctr Assessment & Monitoring Global Cha, Almeria, Spain - Autor o Coautor
Basque Centre for Climate Change (BC3) - Autor o Coautor
Centro de Investigación y Tecnología Agroalimentaria de Aragón - Entidad de origen
CGL2017-83538-C3-1-RPID2020-117825GB-C21PID2020-117825GB-C22 Ministerio de Economia y Competitividad - Financiador
Experimental Station of Arid Zones (EEZA-CSIC) - Autor o Coautor
Expt Stn Arid Zones EEZA CSIC, Desertificat & Geoecol, Almeria, Spain - Autor o Coautor
FJC2018-038192-IIJC2020-045630-IMdM-2017-0714 Ministerio de Ciencia e Innovacion - Financiador
FPU 14/03497 Ministerio de Educacion, Cultura y Deporte - Financiador
IE17_5560_EEZAP20_00016P18-RT-3629A-RNM-318-UGR18 Consejeria de Economia, Innovacion, Ciencia y Empleo, Junta de Andalucia - Financiador
Inter-University Institute for Earth System Research (IISTA-CEAMA) - Autor o Coautor
Interuniv Inst Earth Syst Res IISTA CEAMA, Granada, Spain - Autor o Coautor
Univ Almeria UAL, Agron, Almeria, Spain - Autor o Coautor
Univ Basque Country, Basque Ctr Climate Change BC3, Sci Campus, Leioa, Spain - Autor o Coautor
Univ Granada UGR, Appl Phys, Granada, Spain - Autor o Coautor
Univ Granada UGR, Ecol, Granada, Spain - Autor o Coautor
University of Almeria - Autor o Coautor
University of Granada - Autor o Coautor
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Resúmen

Resúmen: Subterranean ventilation is a non-diffusive transport process that provokes the abrupt transfer of CO2-rich air (previously stored) through water-free soil pores and cracks from the vadose zone to the atmosphere, under high-turbulence conditions. In dryland ecosystems, whose biological carbon exchanges are poorly characterized, it can strongly determine eddy-covariance CO2 fluxes that are used to validate remote sensing products and constrain models of gross primary productivity. Although subterranean ventilation episodes (VE) may occur in arid and semi-arid regions, which are unsung players in the global carbon cycle, little research has focused on the role of VE CO2 emissions in land-atmosphere CO2 exchange. This study shows clear empirical evidence of globally occurring VE. To identify VE, we used in situ quality-controlled eddy-covariance open data of carbon fluxes and ancillary variables from 145 sites in different open land covers (grassland, cropland, shrubland, savanna, and barren) across the globe. We selected the analyzed database from the FLUXNET2015, AmeriFlux, OzFlux, and AsiaFlux networks. To standardize the analysis, we designed an algorithm to detect CO2 emissions produced by VE at all sites considered in this study. Its main requirement is the presence of considerable and non-spurious correlation between the friction velocity (i.e., turbulence) and CO2 emissions. Of the sites analyzed, 34% exhibited the occurrence of VE. This vented CO2 emerged mainly from arid ecosystems (84%) and sites with hot and dry periods. Despite some limitations in data availability, this research demonstrates that VE-driven CO2 emissions occur globally. Future research should seek a better understanding of its drivers and the improvement of partitioning models, to reduce uncertainties in estimated biological CO2 exchanges and infer their contribution to the global net ecosystem carbon balance.

Palabras clave: drylands; eddy covariance; fluxnet; global carbon cycle; Carbon-dioxide exchange; Drylands; Eddy covariance; Fluxnet; Global carbon cycle; Interannual variability; Mediterranean ecosystems; Plant litter decomposition; Precipitation pulses; Pressure changes; Semiarid ecosystems; Soil; Subterranean ventilation; Ventilation; Water-vapor adsorption

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