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dc.contributor.authorBarbeta, A.
dc.contributor.authorMiralles, D.G.
dc.contributor.authorMendiola, L.
dc.contributor.authorGimeno, T.E.
dc.contributor.authorSabaté, S.
dc.contributor.authorCarnicer, J.
dc.identifier.citationJournal of Geophysical Research: Biogeosciences: 128 (6) (2023)es_ES
dc.description.abstractThe thermal balance of forests is the result of complex land–atmosphere interactions. Different climate regimes and plant functional types can have contrasting energy budgets, but little is known about the influence of forest structure and functional traits. Here, we combined spaceborne measurements of surface temperature from ECOSTRESS with ground-based meteorological data to estimate the thermal balance at the surface (∆Tcan−air) during four summers (2018–2021), at the Mediterranean–temperate ecotone in the NE Iberian Peninsula. We analyzed the spatiotemporal drivers of ∆Tcan−air by quantifying the effects of meteorology, forest structure (stand density, tree height) and ecophysiology (hydraulic traits), during normal days and hot spells. Canopy temperatures (Tcan) fluctuated according to changes in air temperature (Tair) but were on average 4.2 K warmer. During hot spells, ∆Tcan−air was smaller than during normal periods. We attribute this decrease to the advection of hot and dry air masses from the Saharan region resulting in a sudden increase in Tair relative to Tcan. Vapor pressure deficit (VPD) was negatively correlated with ∆Tcan−air, since the highest VPD values coincided with peaks in heat advection. Nonetheless, Tcan increased with VPD due to decreased transpiration (following stomatal closure), even though sufficient soil water availability enabled some degree of evaporative cooling. Our findings demonstrate that plot-scale forest structural and hydraulic traits are key determinants for the forest thermal balance. The integration of functional traits and forest structure over relevant spatial scales would improve our ability to understand and model land–atmosphere feedbacks in forested regions. © 2023. The Authors.es_ES
dc.description.sponsorshipAB acknowledges a Beatriu de Pinós MSCA-COFUND postdoctoral grant from the Government of Catalonia (2019BP00193). AB and JC received funding from the Spanish Ministry of Science (Grant MICROCLIM, PID2020-117636GB-C21). DGM is supported by the European Research Council (ERC), grant agreement 101088405 (HEAT). TEG received funding from the Spanish Ministry of Science (Grant PHLISCO, PID2019-107817RB-I00). We would like to thank Teresa Rosas, Jordi Martínez-Vilalta and Maurizio Mencuccini by providing the data on plant hydraulic traits and Víctor Granda for his help with the data from the Catalan Forest Laboratory.es_ES
dc.publisherJournal of Geophysical Research: Biogeoscienceses_ES
dc.subjecthot spellses_ES
dc.subjectland-atmosphere feedbackses_ES
dc.subjectremote sensinges_ES
dc.titleDisentangling the Role of Forest Structure and Functional Traits in the Thermal Balance of the Mediterranean–Temperate Ecotonees_ES
dc.rights.holder© 2023. The Authors.es_ES
dc.rights.holderAtribución-NoComercial-CompartirIgual 3.0 España*

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