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LAMTO, Ivory Coast ( 6°13'N / 5°01'W )

LAMTO, Ivory Coast ( 6°13'N / 5°01'W ) Monitoring Atmospheric CO 2 and CH 4 concentrations in Western Africa M.Ramonet , B.Wastine, C.Kaiser, C.Vuillemin, LSCE, Gif sur Yvette A.Diawara, P.Yao, D.Bethuel, Univ. de Cocody, Abidjan. Keeling et al. One atmospheric site:

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LAMTO, Ivory Coast ( 6°13'N / 5°01'W )

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  1. LAMTO, Ivory Coast (6°13'N / 5°01'W) Monitoring Atmospheric CO2 and CH4 concentrations in Western Africa M.Ramonet, B.Wastine, C.Kaiser, C.Vuillemin, LSCE, Gif sur Yvette A.Diawara, P.Yao, D.Bethuel, Univ. de Cocody, Abidjan

  2. Keeling et al. One atmospheric site: global carbon budget From one background atmospheric site we know the CO2accumulation in the atmosphere, from which we can deduced precisely the global carbon sink and its variability.

  3. New observation data (aircraft) Reduction of the C sink at mid north latitude and of the tropical C source Large scale Spatial distribution

  4. Continental/Regional inversions

  5. Atmospheric inversions 2003 Carbon Tracker EU LSCE_V2.0 JENA_S96 CARBON PORTAL 1.04 0.59 0.63 GtC/yr Poussi , Peylin et al., ICOS Carbon Portal Comparison of three different inversions: LSCE (v2.0): Peylin et al. JENA (S96): Roedenbeck et al. Carbon Tracker (EU): Wouters et al.

  6. Atmospheric inversions Fossil emission Fire emission Biosphere (inversion) Total flux LSCE JENA CTracker Poussi , Peylin et al., ICOS Carbon Portal LSCE GtC/Yr CTracker JENA

  7. Finokalia Lampedusa Negev Tenerife Assekrem Hombori Lamto Mt Kenya Ascension To fill in the observational gap in Africa

  8. LAMTO station Run from University of Cocody, Abidjan Staff ~14 people • Primary station of • CTBT network seismic and infrasound) • IDAF network (wet and dry deposition fluxes) • Biomass burning campaigns

  9. From the 50m high tower South view North view

  10. Local challenges • High temperature • High humidity • High content in aerosols

  11. The parts of the analyzer Inlet Pump & filters Calibration Air distribution No drying Air distribution Computer Picarro CRDS Picarro pump UPS (20min autonomy)

  12. Schematic view of the installation

  13. Calibration protocol

  14. CO2~ 0.01 ppm / week CH4~ 0.20 ppb / week WMO recommendation for precision: CO2: ±0.1ppm CH4: ±2 ppb 1 calibration / month Calibrations drift

  15. Picarro Com Prototype for the future European network ?

  16. First measurements

  17. CH4 peaks

  18. Model validation

  19. Preliminary conclusions Analyzer CO2/CH4/H2O  Analyzer ESP running since Aug. 29th  Monthly calibration should be enough CO2:  Strong diurnal CO2 cycle (30-50 ppm) CH4: Synoptic events (50-80 ppb)  70 ppb increase in November Fire season just starting Let's challenge the models...

  20. Thanks for your attention. Annual Meeting 25-27 Nov 2008 Accra, Ghana

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