Planetary Boundary Layer Dynamics Over the Amazon Rain Forest

Details Planetary Boundary Layer Dynamics Over the Amazon Rain Forest Planetary Boundary Layer Dynamics Over the Amazon Rain Forest

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........20o&link_type=abstract

Thesis (PH.D.)--STATE UNIVERSITY OF NEW YORK AT ALBANY, 1990.Source: Dissertation Abstracts International, Volume: 51-04, Secti

Physics

6

Boundary Layer

Scientific paper

Observations of the diurnal evolution of the Planetary Boundary Layer (PBL) over the Amazon rain forest, in the area of the ABLE 2A and 2B experiments showed the existence of a low level circulation with low level nocturnal maxima winds. These circulations are shown to be induced by the thermal contrast between the river and the forest. A linear model was applied to identify the horizontal extent of these circulations and an associated perturbation pressure gradient consistent with the observations. A second order closure model was used to simulate changes in the PBL caused by the thermal circulation. Good agreement with the observations was obtained when the forcing was a horizontal pressure gradient equal to 0.5 mb/100km of limited vertical extent. The dynamics of the equatorial PBL was shown to be plausibly explained using a hypothesis of a river breeze circulation.

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