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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Volume 4, issue 5 | Copyright
Biogeosciences, 4, 759-768, 2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  14 Sep 2007

14 Sep 2007

An airborne regional carbon balance for Central Amazonia

J. Lloyd1, O. Kolle2, H. Fritsch2, S. R. de Freitas3,4, M. A. F. Silva Dias3,4, P. Artaxo5, A. D. Nobre4, A. C. de Araújo6, B. Kruijt6, L. Sogacheva7, G. Fisch8, A. Thielmann9, U. Kuhn9, and M. O. Andreae9 J. Lloyd et al.
  • 1Earth and Biosphere Institute, School of Geography, University of Leeds, Leeds, LS2 9JT, UK
  • 2Max-Planck-Institut für Biogeochemie, P.O. Box 100164, 07701 Jena, Germany
  • 3Departamento de Ciências Atmosféricas, Instituto de Astronomia Geofísica e Ciências Atmosféricas, Univ. de São Paulo, Rua do Matão, 1226, 05508-900, São Paulo, SP, Brazil
  • 4Centro de Previsão do Tempo e Estudos Climaticos, Inst. Nacional de Pesquisas Espaciais, Rodovia Presidente Dutra, Km 40, SP-RJ, 12630-000, Cachoeira Paulista, SP, Brazil
  • 5Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R, 187, Cidade Universitária, 05508-900, São Paulo,SP, Brazil
  • 6Wageningen Univ. and Res. Centre, P.O. Box 47, 6700 AA Wageningen, The Netherlands
  • 7Department of Physical Sciences, P.O. Box 64, 00014 University of Helsinki, Finland
  • 8Centro Técnico Aeroespacial (CTA), Praça Marechal Eduardo Gomes, 50, CEP 12228-904, São José dos Campos, SP, Brazil
  • 9Max-Planck-Institut für Chemie, P.O. Box 3060, 55020 Mainz, Germany

Abstract. We obtained regional estimates of surface CO2 exchange rates using atmospheric boundary layer budgeting techniques above tropical forest near Manaus, Brazil. Comparisons were made with simultaneous measurements from two eddy covariance towers below. Although there was good agreement for daytime measurements, large differences emerged for integrating periods dominated by the night-time fluxes. These results suggest that a systematic underestimation of night time respiratory effluxes may be responsible for the high Amazonian carbon sink suggested by several previous eddy covariance studies. Large CO2 fluxes from riverine sources or high respiratory losses from recently disturbed forests do not need to be invoked in order to balance the carbon budget of the Amazon. Our results do not, however, discount some contribution of these processes to the overall Amazon carbon budget.

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