Annual Meeting 25-27 Nov 2008 Accra, Ghana LAMTO, Ivory Coast (6°13'N / 5°01'W) Monitoring Atmospheric CO 2 and CH 4 concentrations in Western Africa M.Ramonet,

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Presentation transcript:

Annual Meeting Nov 2008 Accra, Ghana 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

Annual Meeting Nov 2008 Accra, Ghana One atmospheric site: global carbon budget Keeling et al. From one background atmospheric site we know the CO 2 accumulation in the atmosphere, from which we can deduced precisely the global carbon sink and its variability.

Annual Meeting Nov 2008 Accra, Ghana Large scale Spatial distribution Reduction of the C sink at mid north latitude and of the tropical C source New observation data (aircraft)

Annual Meeting Nov 2008 Accra, Ghana Continental/Regional inversions

Annual Meeting Nov 2008 Accra, Ghana CARBON PORTAL Comparison of three different inversions: LSCE (v2.0): Peylin et al. JENA (S96): Roedenbeck et al. Carbon Tracker (EU): Wouters et al. Atmosphericinversions GtC/yr2003 LSCE_V2.0JENA_S96 Carbon Tracker EU Poussi, Peylin et al., ICOS Carbon Portal

Annual Meeting Nov 2008 Accra, Ghana Atmosphericinversions Fossil emission Fire emission Biosphere (inversion) Total flux GtC/Yr LSCE JENA CTracker LSCE JENA CTracker Poussi, Peylin et al., ICOS Carbon Portal

Annual Meeting Nov 2008 Accra, Ghana To fill in the observational gap in Africa Ascension Lamto Mt Kenya Assekrem Lampedusa Tenerife Hombori Negev Finokalia

Annual Meeting Nov 2008 Accra, Ghana LAMTO station Primary station of CTBT network seismic and infrasound) IDAF network (wet and dry deposition fluxes) Biomass burning campaigns Run from University of Cocody, Abidjan Staff ~14 people

Annual Meeting Nov 2008 Accra, Ghana North view From the 50m high tower South view

Annual Meeting Nov 2008 Accra, Ghana Local challenges High temperature High humidity High content in aerosols

Annual Meeting Nov 2008 Accra, Ghana InletPump & filtersCalibrationAir distribution Computer Picarro CRDS Picarro pump UPS (20min autonomy) The parts of the analyzer No drying

Annual Meeting Nov 2008 Accra, Ghana Schematic view of the installation

Annual Meeting Nov 2008 Accra, Ghana Calibration protocol

Annual Meeting Nov 2008 Accra, Ghana Calibrations drift CO 2 ~ 0.01 ppm / week CH 4 ~ 0.20 ppb / week 1 calibration / month WMO recommendation for precision: CO 2 : ±0.1ppm CH 4 : ±2 ppb

Annual Meeting Nov 2008 Accra, Ghana Picarro Com Prototype for the future European network ?

Annual Meeting Nov 2008 Accra, Ghana First measurements

Annual Meeting Nov 2008 Accra, Ghana CH 4 peaks

Annual Meeting Nov 2008 Accra, Ghana Model validation

Annual Meeting Nov 2008 Accra, Ghana Analyzer CO 2 /CH 4 /H 2 O  Analyzer ESP running since Aug. 29 th  Monthly calibration should be enough CO 2 :  Strong diurnal CO 2 cycle (30-50 ppm) CH 4 :  Synoptic events (50-80 ppb)  70 ppb increase in November Fire season just starting Let's challenge the models... Preliminary conclusions

Annual Meeting Nov 2008 Accra, Ghana Annual Meeting Nov 2008 Accra, Ghana Thanks for your attention.