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Carbon Dioxide Fluxes Across the Amazon Basin: Insights from 1999-2000 EU-LBA Flux Tower Sites

This study provides an overview of CO2 flux measurements from the Amazon basin conducted in 1999 and 2000. Utilizing eddy covariance techniques at various EU-LBA flux tower sites, the research analyzes seasonal and interannual CO2 flux variations and their relationship with meteorological data. Key findings include differences in carbon uptake between forest and pasture during dry and wet seasons, as well as the influence of local weather phenomena known as "friagem" on CO2 fluxes. The study highlights the complexities of carbon dynamics in tropical ecosystems.

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Carbon Dioxide Fluxes Across the Amazon Basin: Insights from 1999-2000 EU-LBA Flux Tower Sites

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  1. Carbon dioxide fluxes across the Amazon basin: overview of 1999 and 2000 results for EU- LBA-flux tower sites Kabat, P.1), Nobre, A D2), Grace, J3) , Manzi, A4) ,Kruijt, B1), Von Randow, C 4), Elbers, J E1), Malhi, Y 3), Carswell, F 3), Da Costa, L.5), Culf, A6), Nobre, C 4), Da Rocha, H 7), Waterloo, M1), De Araujo, A C2), De Oliveira, P J4)9), Stefani, P8), Freitas, H7) 1) Alterra, NL, 2) INPA, Brazil, 3) Edinburgh University, UK, 4) CPTEC/INPE, Brazil, 5) UFPA,MPEG, EMBRAPA, Brazil, 6) CEH, UK, 7)USP, Brazil, 8) Universita della Tuscia, Italy, 9) ULBRA, UNIR, Brazil

  2. EUSTACH Sites Manaus K34 and Manaus C14 Caxiuana Rebio Jaru Fazenda Nossa Senhora

  3. Towers at Reserva Biologica do Jaru ‘Abracos’ New tower

  4. Methods Eddy correlation: Systems based on ‘Edisol’ (Moncrieff et al, 1996) and ‘Euroflux’ (Aubinet et al, 1999) closed-path principle. Gill-Solent 3-D sonic anemometer Li-Cor 6262 Gas analyser SHORT tube, high pumping rate Calculation: delay removal, 3 rotations, 800s recursive detrend, correction for detrend loss of low frequencies (Except at Caxiuana) Storage fluxes: (in-canopy profiles of CO2 and H2O (CIRAS SC analyser) ) (Not always present) Meteorological data: Automatic weather station, short&long wave radiation, etcetera.

  5. Measured CO2 eddy fluxes over 2 years in the Central and Southern Amazon Data are 10-day averages. Missing data are green or dark blue

  6. Night-time NEE (Storage corrected) fluxes plotted against u* Do we have a problem? ? Uncertainty about 7 t ha-1 y-1 ? ? There is no problem here

  7. 7-8 T ha-1y-1 5-6 T ha-1y-1 Seasonal and interannual variation in C flux, annual net uptake

  8. Mean Diurnal trend of CO2 fluxes at four sites • Dry seasons: • Forest peak uptake similar, nights different. • Pasture lower uptake! Dry Wet • Wet seasons: • Forests and pasture very similar.

  9. Where is seasonality in Jaru? Mean Diurnal Cumulative mean diurnal

  10. Where is seasonality in Manaus K34? Mean Diurnal Cumulative mean diurnal

  11. Mean hourly canopy light response curves for four sites

  12. Ecosystem response at monthly time scales Radiation Rainfall

  13. Similarity relations - representativity for surface For all sites the basic s(w)/u* relations are good on average

  14. The effecct of Friagem on CO2 fluxes in Jaru (P.J. Oliveira) Are friagem effects caused by low temperature or are they simply more windy days?

  15. Energy balance closure at Reserva Jaru and Fazenda Nossa Senhora

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