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Biogeosciences Discussions 4, 1 (2007) 99-123
An airborne regional carbon balance for Central Amazonia
J. Lloyd 1, O. Kolle 2, H. Fritsch 2, S. R. De Freitas 3, 4, M. A. F. Silva Dias 3, 4, P. Artaxo 5, A. D. Nobre 4, A. C. De Araújo 6, B. Kruijt 6, L. Sogacheva 7, G. Fisch 8, A. Thielmann 9, U. Kuhn 9, M. O. Andreae 9

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.
1 :  Earth and Biosphere Institute
School of Geography
2 :  Max-Planck-Institut für Biogeochemie
Max-Planck-Institut für Biogeochemie
3 :  Departamento de Ciências Atmosféricas
Instituto de Astronomia Geofísica e Ciências Atmosféricas
4 :  Center for Weather Forecasting and Climate Studies (CPTEC)
Center for Weather Forecasting and Climate Studies
5 :  Instituto de Fisica
Universidade de São Paulo
6 :  Wageningen Univ. and Res. Centre
Wageningen Univ. and Res. Centre
7 :  Department of Physical sciences
Department of Physical Sciences
8 :  Centro Técnico Aeroespacial (CTA)
Praça Marechal Eduardo Gomes
9 :  Max-Planck-Institut für Chemie
Max-Planck-Institut für Chemie
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique

Planète et Univers/Interfaces continentales, environnement

Planète et Univers/Océan, Atmosphère

Planète et Univers/Sciences de la Terre
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