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Observations of radiation exchange above and below Amazonian forest
Author(s) -
Shuttleworth W. James
Publication year - 1984
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.49711046623
Subject(s) - shortwave radiation , environmental science , albedo (alchemy) , shortwave , atmospheric sciences , solar constant , longwave , flux (metallurgy) , radiation , canopy interception , canopy , amazonian , radiation flux , solar irradiance , physics , amazon rainforest , geography , soil water , radiative transfer , soil science , materials science , art , ecology , biology , quantum mechanics , art history , performance art , throughfall , archaeology , metallurgy
Measurements of shortwave and longwave components of the radiation budget were made above and below tropical forest in the Amazon Basin for a total duration of 203 hours in September 1983. Albedo was (12.25±0.2)%, and showed a small variation with solar altitude. The net outward flux of longwave radiation was around 30 W m −2 , and fairly constant over the day. The relationship between net radiation, R, and solar radiation, S, was adequately described by the expression R = (0.858±0.006)S ‐ (35.0±1.9) (W m −2 ). The fraction of solar radiation reaching the bottom of the canopy was low, about one per cent: net radiation in this position was consistent with low soil heat flux and low soil evaporation.