Meteorology and Atmospheric Physics

, Volume 104, Issue 1–2, pp 83–93 | Cite as

Cloud condensation nuclei from biomass burning during the Amazonian dry-to-wet transition season

  • Jorge Alberto Martins
  • Fábio Luiz T. Gonçalves
  • Carlos A. Morales
  • Gilberto F. Fisch
  • Francisco Geraldo M. Pinheiro
  • João Bosco V. Leal Júnior
  • Carlos J. Oliveira
  • Emerson M. Silva
  • José Carlos P. Oliveira
  • Alexandre A. Costa
  • Maria Assunção F. Silva Dias
Original Paper


Aircraft measurements of cloud condensation nuclei (CCN) during the Large-Scale Biosphere–Atmosphere Experiment in Amazonia (LBA) were conducted over the Southwestern Amazon region in September–October 2002, to emphasize the dry-to-wet transition season. The CCN concentrations were measured for values within the range 0.1–1.0% of supersaturation. The CCN concentration inside the boundary layer revealed a general decreasing trend during the transition from the end of the dry season to the onset of the wet season. Clean and polluted areas showed large differences. The differences were not so strong at high levels in the troposphere and there was evidence supporting the semi-direct aerosol effect in suppressing convection through the evaporation of clouds by aerosol absorption. The measurements also showed a diurnal cycle following biomass burning activity. Although biomass burning was the most important source of CCN, it was seen as a source of relatively efficient CCN, since the increase was significant only at high supersaturations.


Supersaturation Biomass Burning Tropical Rainfall Measure Mission Cloud Droplet Amazonian Region 



This study was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Financiadora de Estudos e Projetos (FINEP), and Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP).


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Jorge Alberto Martins
    • 1
  • Fábio Luiz T. Gonçalves
    • 2
  • Carlos A. Morales
    • 2
  • Gilberto F. Fisch
    • 3
  • Francisco Geraldo M. Pinheiro
    • 4
  • João Bosco V. Leal Júnior
    • 4
  • Carlos J. Oliveira
    • 4
  • Emerson M. Silva
    • 4
  • José Carlos P. Oliveira
    • 5
  • Alexandre A. Costa
    • 4
    • 6
  • Maria Assunção F. Silva Dias
    • 2
    • 7
  1. 1.Universidade Tecnológica Federal do ParanáLondrinaBrazil
  2. 2.Universidade de São PauloSão PauloBrazil
  3. 3.Centro Técnico AeroespacialSão José dos CamposBrazil
  4. 4.Universidade Estadual do CearáFortalezaBrazil
  5. 5.Universidade Federal do CearáFortalezaBrazil
  6. 6.Fundação Cearense de Meterologia e Recursos HídricosFortalezaBrazil
  7. 7.Centro de Previsão de Tempo e Estudos ClimáticosCachoeira PaulistaBrazil

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