Ecosystem CO2 release driven by wind occurs in drylands at global scale
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Moya, M. Rosario; López Ballesteros, Ana; Sánchez Cañete P., Enrique; Serrano Ortíz, Penélope; Oyonarte Gutiérrez, Cecilio; [et al.]Fecha
2022-04-12Resumen
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 ba...
Palabra/s clave
drylands,
eddy covariance,
FLUXNET
global carbon cycle
ventilation