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- Title
The convective boundary layer over pasture and forest in Amazonia.
- Authors
Fisch, G.; Tota, J.; Machado, L. A. T.; Silva Dias, M. A. F.; Lyra, R. F. da F.; Nobre, C. A.; Dolman, A. J.; Gash, J. H. C.
- Abstract
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 550m deeper compared to that over the forest. The measurements showed the height of the fully developed CBL for pasture to be 1650 m, 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 1000 m) 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.
- Subjects
RONDONIA (Brazil : State); BRAZIL; AMAZON River Region; BOUNDARY layer control; MODELS of surfaces; HEAT flux transducers; SCIENTIFIC observation; FORESTS &; forestry
- Publication
Theoretical & Applied Climatology, 2004, Vol 78, Issue 1-3, p47
- ISSN
0177-798X
- Publication type
Article
- DOI
10.1007/s00704-004-0043-x