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Optimisation of CHIMERE configuration in the frame of an ozone sensitivity study

Optimisation of CHIMERE configuration in the frame of an ozone sensitivity study. Fanny Lasry, Isabelle Coll. CHIMERE workshop 21 – 22 March 2005.

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Optimisation of CHIMERE configuration in the frame of an ozone sensitivity study

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  1. Optimisation of CHIMERE configuration in the frame of an ozone sensitivity study Fanny Lasry, Isabelle Coll CHIMERE workshop 21 – 22 March 2005

  2. Action engaged in order to reduce ozone concentrations in the troposphere (Göteborg protocol) Efficiency of these measures on ozone concentrations? Study focused on the Berre-Marseilles area (South of France), frame of the ESCOMPTE program Industrial area • Diversity of the emitters => variety of primary compounds Urban area • Coastal site => small scale phenomena such as sea-breeze Problematic Ozone: harmful pollutant - respiratory troubles - yield decrease

  3. Strategy Research of an optimized configuration of CHIMERE in order to simulate ozone episodes in such a complex area Characteristics of the region Model configuration • Small scale dynamic • (sea breeze phenomenon) • Variety of the emitted compounds Dynamical fields ECMWF (0.5°) -> RAMS, MM5 (3km) Emission inventory GENEMIS -> ESCOMPTE Chemical mechanism MELCHIOR (44 species) -> SAPRC (80 species)

  4. SAPRC99 (Carter) • “A detailed mechanism for the gas-phase atmospheric reactions of VOCs and NOx in urban and regional atmospheres” (documentation of the SAPRC99 chemical mechanism for VOC reactivity assessment, Carter, 2000) • Used to “determine the absolute and relative ozone impact of the many types of VOCs that can be emitted into the atmosphere, and for other control strategy and research applications” • Used to calculate the various ozone reactivity scales developed by Carter (MIR, 1994) Implantation in CHIMERE 82 species – 30 VOCs 241 reactions Representation of the radicals chemistry Detailed speciation of VOCs and RO2

  5. Impact of a better resolved dynamic on ozonefields Boundary layer height ECMWF (0.5°) MM5 (3km) Boundary layer better resolved Better restitution of the sea breeze – wind fields perpendicular to the coast

  6. RAMS Bias on maximal values ECMWF MM5 Model overestimation Sea breezes days Synoptic conditions days Impact of a better resolved dynamic on ozonefields

  7. ESCOMPTE Higher Nox emissions in town Higher biogenic VOCs emissions Impact of a more accurate emission inventory on ozonefields GENEMIS NOx VOC

  8. Better restitution of the diurnal cycle of ozone: - Better titration by the NOx at night - Increase of ozone maximal values up to 10 ppb locally Better restitution of primary compounds levels, especially in urban areas Impact of a more accurate emission inventory on ozonefields ESCOMPTE GENEMIS

  9. Overestimation of ozone maximal values with MELCHIOR: too productive? SAPRC: better scores, less false alert Success index – 90ppb threshold Success index – 90ppb threshold MM5+ESC+MELCHIOR MM5+ESC+SAPRC Missed alert Correct alert False alert Impact of the chemical mechanism on ozonefields

  10. Initial configuration ECMWF+GENEMIS+MELCHIOR Scenario configuration MM5+PRIMEQUAL+SAPRC Final configuration MM5+ESCOMPTE+SAPRC

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