The convective boundary layer over pasture and forest in Amazonia |
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| Authors: | G Fisch J Tota L A T Machado M A F Silva Dias R F da F Lyra C A Nobre A J Dolman J H C Gash |
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| Institution: | (1) Centro Técnico Aeroespacial (CTA/IAE), São José dos Campos, Brazil;(2) Inst. Nac. de Pesquisas Espaciais (INPE), SJ dos Campos, Brazil;(3) Universidade de São Paulo (USP/IAG), São Paulo, Brazil;(4) Universidade Federal de Alagoas (UFAL), Maceió, Brazil;(5) Free University, 1081 HV Amsterdam, The Netherlands;(6) Centre for Ecology and Hydrology (CEH), Wallingford, UK |
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| Abstract: | Summary The coupling between different types of surface (tropical forest or grass) and the Convective Boundary Layer (CBL) has been investigated using observational (rawinsoundings) data collected over Rondônia in southwest Amazonia. The data reported here support the notion that deforestation may modify the dynamics of the boundary layer, in particular during the dry season. In this period the sensible heat fluxes are very high over pasture, creating a CBL around 550 m deeper compared to that over the forest. The measurements showed the height of the fully developed CBL for pasture to be 1650m, compared to around 1100m for forest. During the wet season the height of the CBL is lower than during the dry season and has the same height (around 1000m) for forest and pasture sites. The CBL over pasture is hotter and drier than over forest during the dry season, but during the wet season the air temperatures and humidities are similar. Comparing the CBL growth during the dry and wet season, there is evidence that the CBL properties over the forest are not dependent on the surface characteristics, but over the pasture they are. |
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