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Scientists Trek to Africa for Biosphere-Atmosphere Chemistry Study

hed light on a global problem in biosphere-atmosphere chemistry. Plants take up vast amounts of carbon, particularly in the lush tropics, but plants and soils also release carbon, and the overall cycling in the tropics may be affected by the perennial fires.

This fall's campaign is focused at two sites: one in a rainforest near the Congo's Nouabale-Ndoki National Park and the other in the rainforest-savanna transition zone near Bangui, the Central African Republic capital. EXPRESSO is collecting chemical data at these sites along with meteorological data throughout the study area to explore how the vegetation and fires interact with the atmosphere.

To sample the African atmosphere, EXPRESSO is using:

  • enclosures that measure atmospheric exchange from leaves and soil
  • a 60-meter tower studded with meteorological instruments and air samplers
  • a balloon tethered for brief periods at heights of up to a kilometer
  • France's Arat research aircraft, flying out of Bangui

"There's never before been a program in this region that has combined all the elements of photochemistry, biochemistry, and meteorology," says NCAR's Pat Zimmerman.


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Contact: Cheryl Dybas
cdybas@nsf.gov
703-306-1070
National Science Foundation
8-Nov-1996


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