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Dry Season Micrometeorology of Central Amazonian Ranchland
Author(s) -
Wright I. R.,
Gash J. H. C.,
Da Rocha H. R.,
Shuttleworth W. J.,
Nobre C. A.,
Maitelli G. T.,
Zamparoni C. A. G. P.,
Carvalho P. R. A.
Publication year - 1992
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49711850804
Subject(s) - amazonian , dry season , bowen ratio , environmental science , atmospheric sciences , felling , sensible heat , canopy , energy balance , hydrology (agriculture) , amazon rainforest , meteorology , physics , geography , geology , agroforestry , ecology , cartography , geotechnical engineering , archaeology , biology , thermodynamics
This paper presents the first comprehensive micrometeorological measurements to be recorded over post‐deforestation Amazonian ranchland. the ranch was managed for the production of beef cattle and had been created by felling and burning the original rainforest 12 years previously. the measurements allow derivation of the aerodynamic roughness, and a description of the response of the energy balance and surface conductance to the progressing dry season. Zero‐plane displacement and roughness length were derived from wind‐speed profiles as O.17 ± 0.03 m and 0.026 ± 0.003m respectively, while measurement of energy partition was achieved, with excellent agreement, between three independent measurement systems. During the 1990 dry season, average evaporation diminished from 3.8 to 2.1 mm d‐ 1 as the Bowen ratio increased from 0.43 to 0.67. Values of surface conductance were derived and these compare well with expected trends.