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Evaporation of intercepted rainfall from isolated evergreen oak trees: Do the crowns behave as wet bulbs?

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dc.contributor.authorPereira, Fernando Leite
dc.contributor.authorGash, John H.C.
dc.contributor.authorDavid, Jorge Soares
dc.contributor.authorValente, Fernanda
dc.date.accessioned2022-02-01T11:17:41Z
dc.date.available2022-02-01T11:17:41Z
dc.date.issued2009
dc.description.abstractA new approach is suggested for estimating evaporation of intercepted rainfall from single trees in sparse forests. It is shown that, theoretically, the surface temperature of a wet tree crown will depend on the available energy and windspeed. But for a fully saturated canopy under rainy conditions, surface temperature will approach the wet bulb temperature when available energy tends to zero. This was confirmed experimentally from measurements of the radiation balance, aerodynamic conductance for water vapour and surface temperature on an isolated tree crown. Net radiation over a virtual cylindrical surface, enclosing the tree crown, was monitored by a set of radiometers positioned around that surface. Aerodynamic conductance for the tree crown was derived by scaling up measurements of leaf boundary layer conductance using the heated leaf replica method. Thermocouples were used to measure the average leaf surface temperature. Results showed that a fully wet single tree crown behaves like a wet bulb, allowing evaporation of intercepted rainfall to be estimated by a simple diffusion equation for water vapour, which is not restricted by the assumptions of one-dimensional transfer models usually used at the stand scale. Using this approach, mean evaporation rate from wet, saturated tree crowns was 0.27 or 0.30mm h 1, when surface temperature was taken equal to the air wet bulb temperature or estimated accounting for the available energy, respectively.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationPEREIRA, F.L. [et al.] (2009) - Evaporation of intercepted rainfall from isolated evergreen oak trees: Do the crowns behave as wet bulbs? Agricultural and Forest Meteorology. 149:3-4, p. 667-679. DOI: 10.1016/j.agrformet.2008.10.013pt_PT
dc.identifier.doi10.1016/j.agrformet.2008.10.013pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.11/7873
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationThis study was supported by research project SAPIENS/FCT NO. POCTI/AGG/ 39220/2001 funded by the Fundação para a Ciência e Tecnologia. Funding was also provided by the Conselho de Reitores das Universidades Portuguesas and the British Council under the Treaty of Windsor Programme 2007/08 – U27.pt_PT
dc.subjectEvaporationpt_PT
dc.subjectRainfall interceptionpt_PT
dc.subjectIsolated treespt_PT
dc.subjectQuercus ilexpt_PT
dc.subjectWet bulb temperaturept_PT
dc.subjectSurface temperaturept_PT
dc.titleEvaporation of intercepted rainfall from isolated evergreen oak trees: Do the crowns behave as wet bulbs?pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage679pt_PT
oaire.citation.issue3-4pt_PT
oaire.citation.startPage667pt_PT
oaire.citation.titleAgricultural and Forest Meteorologypt_PT
oaire.citation.volume149pt_PT
person.familyNameLeite Pereira
person.givenNameFernando
person.identifier.ciencia-idB710-F492-0A79
person.identifier.orcid0000-0003-0087-4384
person.identifier.ridD-8053-2011
person.identifier.scopus-author-id25723657600
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication83206420-4fd8-4877-b0bd-3e1adb2131fa
relation.isAuthorOfPublication.latestForDiscovery83206420-4fd8-4877-b0bd-3e1adb2131fa

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