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Göran Frank

Director of graduate studies

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Airborne measurements of trace gas and aerosol particle emissions from biomass burning in Amazonia

Author

  • Pascal Guyon
  • Göran Frank
  • Michael Welling
  • Duli Chand
  • P. Artaxo
  • L. Rizzo
  • G. Nishioka
  • O. Kolle
  • H. Fritsch
  • M.A.F. Silva Dias
  • L.V. Gatti
  • A.M. Cordova
  • Meinrat O. Andreae

Summary, in English

As part of the LBA-SMOCC (Large-Scale Biosphere-Atmosphere Experiment in Amazonia – Smoke, Aerosols, Clouds, Rainfall, and Climate) 2002 campaign, we

studied the emission of carbon monoxide (CO), carbon dioxide (CO2), and aerosol particles from Amazonian deforestation fires using an instrumented aircraft. Emission ratios for aerosol number (CN) relative to CO (ERCN/CO) fell in the range 14–32 cm−3 ppb−1 in most of the investigated smoke plumes. Particle number emission ratios have to our knowledge not been previously measured in tropical deforestation fires, but our results are in agreement with values usually found from tropical savanna fires. The number of particles emitted per amount biomass burned was found to be dependent on the fire conditions (combustion efficiency). Variability in ERCN/CO between fires was similar to the variability caused by variations in combustion behavior within each individual fire. This was confirmed by observations of CO-to-CO2 emission ratios (ERCO/CO2 ), which stretched across the same wide range of values for individual fires as for all the fires observed during the sampling campaign, reflecting the fact that flaming and smoldering phases are present imultaneously

in deforestation fires. Emission factors (EF) for CO

and aerosol particles were computed and a correction was

applied for the residual smoldering combustion (RSC) fraction

of emissions that are not sampled by the aircraft, which

increased the EF by a factor of 1.5–2.1. Vertical transport

of smoke from the boundary layer (BL) to the cloud detrainment layer (CDL) and the free troposphere (FT) was found to be a very common phenomenon. We observed a 20% loss

in particle number as a result of this vertical transport and

subsequent cloud processing, attributable to in-cloud coagulation.

This small loss fraction suggests that this mode of

transport is very efficient in terms of particle numbers and occurs mostly via non-precipitating clouds. The detrained aerosol particles released in the CDL and FT were larger than in the unprocessed smoke, mostly due to coagulation and secondary growth, and therefore more efficient at scattering radiation and nucleating cloud droplets. This process may have significant atmospheric implications on a regional and larger scale.

Publishing year

2005

Language

English

Pages

2989-3002

Publication/Series

Atmospheric Chemistry and Physics

Volume

5

Issue

11

Document type

Journal article

Publisher

Copernicus Gesellschaft mbH

Topic

  • Subatomic Physics

Status

Published

Research group

  • Aerosol, Nuclear Physics

ISBN/ISSN/Other

  • ISSN: 1680-7324