The Priestley-Taylor parameter α for the Amazon forest

dc.contributorLaboratório de Pesquisas Atmosféricas e Oceânicas - LPAO 12201 S.J. Campos
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.creatorViswanadham, Y.
dc.creatorSilva Filho, V. P.
dc.creatorAndré, R. G B [UNESP]
dc.date2014-05-27T11:17:25Z
dc.date2014-05-27T11:17:25Z
dc.date1991-02-01
dc.date.accessioned2023-09-12T07:17:10Z
dc.date.available2023-09-12T07:17:10Z
dc.identifierhttp://dx.doi.org/10.1016/0378-1127(91)90143-J
dc.identifierForest Ecology and Management, v. 38, n. 3-4, p. 211-225, 1991.
dc.identifier0378-1127
dc.identifierhttp://hdl.handle.net/11449/130477
dc.identifier10.1016/0378-1127(91)90143-J
dc.identifierWOS:A1991FC49800007
dc.identifier2-s2.0-0025994472
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8779781
dc.descriptionPriestley and Taylor provided a practical formulation of the partitioning of net radiation between heat flux and evaporation contained within a parameter α. Their model (PTM) needs verification under a range of environmental conditions. Micrometeorological data sets collected over the Amazon forest at the Ducke Reserve site (2°57′S; 59°57′W) gave an opportunity to evaluate α. Evidence presented here and by others shows that there is pronounced diurnal variation in α, with minimum values around midday and maximum values in the morning and evening hours. During unstable and stable conditions in the daylight hours, the Bowen ratio (B) varied from 0.10 to 0.57 and -0.71 to -0.08, respectively, whereas α varied from 0.67 to 1.16 and 1.28 to 3.12, respectively. A mean value of α = 1.16±0.56 was obtained from daytime hourly values for two days. The daily data sets from three expeditions gave a mean of α = 1.03±0.13. This work confirms that α is a function of atmospheric stability over the Amazon forest. Thus the PTM should be applied with caution over time-intervals of one day or less because of the sensitivity to variation in α. The calculated values of α are in general agreement with those reported in literature. © 1991.
dc.descriptionInstituto de Pesquisas Espaciais - INPE Secretaria Especial da Ciência e Tecnologia Laboratório de Pesquisas Atmosféricas e Oceânicas - LPAO 12201 S.J. Campos, SP
dc.descriptionUniversidade Estadual Paulista - UNESP, Campus de Jaboticabal, 14870 Jaboticabal, SP
dc.descriptionUniversidade Estadual Paulista - UNESP, Campus de Jaboticabal, 14870 Jaboticabal, SP
dc.format211-225
dc.languageeng
dc.publisherElsevier B.V.
dc.relationForest Ecology and Management
dc.relation3.169
dc.relation1,625
dc.rightsAcesso restrito
dc.sourceScopus
dc.subjectalpha diurnal variation
dc.subjectBowen ratio
dc.subjectnet radiation partitioning
dc.subjectparameter alpha
dc.subjectPriestley-Taylor formulation
dc.subjectstability
dc.subjectBrazil, Amazon Forest
dc.titleThe Priestley-Taylor parameter α for the Amazon forest
dc.typeArtigo


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