RELATIONSHIP BETWEEN CANOPY TURBULENCE AND VERTICAL DISTRIBUTION OF REACTIVE GASES IN THE CENTRAL AMAZON RAINFOREST

Ano: 2016 | Volume: 38 | Número: Especial

Autores: Dandan Wei, Jesus Ruiz-Plancarte, Livia Souza Freire, Tobias Gerken, Marcelo Chamecki, Jose Fuentes, Paul Stoy, Amy Trowbridge, Rosa Nascimento dos Santos, Otávio Costa Acevedo, Nelson Luis Dias

Palavras-chave: ozone, turbulence, rainforest, amazon, forest canopies

Resumo Inglês:

Ozone plays a crucial role in the chemistry of the tropical atmospheric boundary layer. In the rainforest, ozone sources and sinks are complex due to numerous chemical reactions and surface deposition. Turbulent transport controls the vertical distribution of ozone. A field study in the Amazonia, near Manaus, Brazil during 2014 shows different shapes of ozone profiles as a response to changes in air turbulence during night-to-day and day-to-night transitions. During the night-to-day transition following sunrise ozone levels increase within the canopy due to photochemical production and increased vertical mixing. The vertical transport of ozone to the lower layers of the canopy is enhanced after the thermal inversion in the canopy disappears. At night, the ozone deposition to the ground and the foliage in the lower canopy is strong. After midnight, the lower canopy is devoid of ozone. Relatively high gradients of ozone levels within the forest during the nighttime also result from the decoupling between the in- and above-canopy environment that limits the forest-atmosphere ozone exchange. Processes responsible for the vertical distribution ozone are necessary to estimate the oxidation of the plant-emitted gases whose reaction products are aerosol precursors.