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List of Abstracts 91particles, from biogenic origin, dominate the volume size spectra, either at dry or wet season. The volumeratio between coarse and fine mode increases greatly at night, suggesting a nocturnal release of biogenicparticles as a result of the ecosystem natural metabolism. Occasionally we observed long range transport soildust from the Sahara, that occurs mainly from February to May.P-Observations 1.11 ID:4243 15:35Satellite multispectral observations of carbon monoxide from a geostationary perspectiveDavid Edwards, Avellino Arellano, Merritt DeeterNCARContact: edwards@ucar.eduThe 2007 US National Research Council Decadal Survey calls for a geostationary satellite mission foratmospheric composition and air quality applications (GEO- CAPE, Geostationary Coastal and Air PollutionEvents Mission). The requirement includes a multispectral (near- and thermal infrared) measurement ofcarbon monoxide (CO), a primary pollutant that plays an important role in tropospheric chemistry. CO isalso an important precursor of tropospheric ozone and serves as an excellent tracer of transport processes. Inthis paper we analyze the temporal and spatial variability of CO with the aid of regional models andobservations and discuss a role for observing system simulation experiments (OSSEs) in helping to definethe CO measurement requirements for GEO-CAPE. Compared with the current capability of low-Earth orbitsensors, CO measurements from GEO-CAPE would have the advantages of increased spatiotemporalresolution and sampling, and enhanced measurement sensitivity to the lowermost troposphere with amultispectral retrieval. We illustrate this with OSSE case studies showing the improvement in surface COforecasts.P-Observations 1.12 ID:4254 15:35The Monitoring Atmospheric Composition and Climate MACC ProjectClaire Granier 1 , Adrian Simmons 2 , The MACC Management Board 31 LATMOS/IPSL, Paris, France2 ECMWF, REading, UK3 MACC Management BoardContact: claire.granier@latmos.ipsl.frThe goal of the MACC (Monitoring Atmospheric Composition and Climate) project is to operate andimprove data-analysis and modelling systems for a range of atmospheric constituents that are important forclimate, air quality and surface solar radiation. Product lines include data records on atmosphericcomposition for recent years, data for monitoring present conditions and forecasts of the distribution of keyconstituents for a few days ahead.MACC is funded by the European Union and provides the pre-operational atmospheric environmentalservice of the European Global Monitoring for Environment and Security (GMES). This servicecomplements the weather analysis and forecasting services provided by European and national organisationsby addressing the composition of the atmosphere.The building blocks of MACC are a set of components with specific functions that are grouped into fourclusters. The input data cluster acquires the satellite and in-situ observations and carries out preparatoryprocessing of them. It also provides improved estimates of surface emissions of key species, with a particularemphasis on the highly variable emissions from fires. The primary global and regional clusters operate andiCACGP-IGAC 2010 12 July, 2010