An airborne regional carbon balance for Central Amazonia

J. Lloyd, O. Kolle, H. Fritsch, S.R. de Freitas, M.A.F. Silva Dias, P. Artaxo, A.D. Nobre, A.C. de Araújo, B. Kruijt, L. Sogacheva, G. Fisch, A. Thielmann, U. Kuhn, M.O. Andreae

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32 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)759-768
JournalBiogeosciences
Volume4
Issue number5
DOIs
Publication statusPublished - 2007

Keywords

  • atmospheric co2 concentrations
  • plant-growth responses
  • boundary-layer budgets
  • soil nutrient status
  • rain-forest
  • tropical forest
  • water-vapor
  • eddy covariance
  • central siberia
  • dioxide uptake

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