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Regional scale N 2 O fluxes in eastern and central Amazônia: 2001 - 2007

Regional scale N 2 O fluxes in eastern and central Amazônia: 2001 - 2007. Monica T.S. D’Amelio Luciana Vanni Gatti John B. Miller Pieter Tans. Outline. Vertical profile samples N 2 O Flux Calculation Enhancement of N 2 O since 2004 N 2 O Flux seasonality CO x N 2 O.

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Regional scale N 2 O fluxes in eastern and central Amazônia: 2001 - 2007

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  1. Regional scale N2O fluxes in eastern and central Amazônia: 2001 - 2007 Monica T.S. D’Amelio Luciana Vanni Gatti John B. Miller Pieter Tans

  2. Outline • Vertical profile samples • N2O Flux Calculation • Enhancement of N2O since 2004 • N2O Flux seasonality • CO x N2O

  3. N2O is the 3rd most important anthropogenic greenhouse gas • Life time: 120 years • Global Warming Potential: 300 (100-years time-horizon) In 1750 270ppb

  4. Sample Sites: SAN, MAN Regional scale 4 - 5 km SAN: Dec 2000 - Dec 2008 MAN: Dec 2004 - Dec 2007 NOAA: 2000-2003 IPEN: 2004-2008 Gases: CO2, CH4, CO, H2, N2O, SF6

  5. Methodology of Calculation

  6. Barbados (RPB) Ascension (ASC) Flux calculation Miller et al., 2007 method Very Large Flux Chamber FLOW MAN SAN FTL Trajectories Study (Hysplit model)

  7. Back-trajectory – Hysplit model

  8. Background calculation ?

  9. 2x105 ‘No’ Emissions Defining tracer gas SF6 = Tracer gas

  10. Background calculation

  11. Results

  12. N2O Time series Above 1200m Before 2004 0.1 ppb After 2004 0.7 ppb Below 1200m Before 2004 0.3 ppb After 2004 0.9 ppb

  13. Normalized Profiles

  14. FSAN = 1.5 mgN2O/m²/yr FMAN = 2.1 mgN2O/m²/yr

  15. N2O x CO - SAN Ratio CO/N2O 229 molCO/molN2O (coast to SAN) Andreae and Merlet  817 molCO/molN2O (tropical forest)

  16. 1.7 1.9 1.9

  17. Summary • Simple transport model, but calibrated with SF6 measurements. • Enhancement of N2O mixing ratio since 2004 • N2O Flux seasonality from coast to SAN and less seasonality from coast to MAN • From coast to SAN – wet, dry high fluxes • CO x N2O: no clear pattern

  18. Acknowledged LQA

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