Modelling Activities at LAC PSI in Switzerland AndreaniAksoyolu

Modelling Activities at LAC (PSI) in Switzerland Ş. Andreani-Aksoyoğlu, J. Keller, I. Barmpadimos, D. Oderbolz, A. S. H. Prévôt Laboratory of Atmospheric Chemistry (LAC) Paul Scherrer Institute, Switzerland http: //lac. web. psi. ch TFMM Workshop, Larnaca May 2010 1

Components of the Air Quality Model Global Models em. CAMx Initial and Boundary Concentrations (Old) (New) COSMOECMWF MM 5 WRF CAMx 5 Regional Air Quality Model Meteorolo gy Emissions Air Pollutant Concentration s 2

Recent Applications §The impact of reducing the maximum speed limit on motorways in Switzerland to 80 km/h on emissions and peak ozone (Keller et al. , 2008, Environ. Mod & Soft. ) §Influence of various emission scenarios on ozone in Europe (Andreani et al. , 2008, Ecological Modelling) §Secondary aerosols in Switzerland northern Italy: Modelling and sensitivity studies for summer 2003. (Andreani et al. , 2008, JGR) 3

Most recent study : Modelling Summer and Winter Air Quality in Switzerland (Andreani et al. , in prep. ) Ozone Formation (June 2006): • Sensitivity to anthropogenic NOx and VOC emissions • Comparison of ozone sensitivity 1993 -2006 • Sensitivity to isoprene emissions Aerosol Formation (January, June 2006, January 2007): • Inorganic Aerosols: Sensitivity to NOx and NH 3 emissions • Organic Aerosols: Contribution of biogenic VOC 4

Modelling Method § 3 nested domains 27 x 27 km 2 § 1 -31 January 2006 1 -30 June 2006 1 -31 January 2007 9 x 9 km 2 3 x 3 km 2 § 31 layers in MM 5 14 layers in CAMx § PM 2. 5 § CB 05 gas -phase mechanism § 7 SOA classes § Oligomerization of SOA 5

Ozone : Sensitivity to Precursor Emissions O 3 (50% NOx) - O 3 (50% VOC) 1993 2006 Blue : NOx-sensitive Red : VOC-sensitive 6

Ozone : Sensitivity to Isoprene Emissions O 3 (isoprene x 20) - O 3 (Base Case) 7

Aerosols : Sensitivity to NOx, NH 3 emissions PM 2. 5 (50% NOx) - PM 2. 5 (50% NH 3) Blue : NOx-sensitive Red : NH 3 -sensitive 15 June 2006, afternoon 8

Aerosols: Relative contributions (winter 2006, Zurich) Measurements Model predictions Organic aerosols and particulate nitrate are the main components 9

Aerosols: Relative contributions (summer 2006, Payerne) Measurements Model predictions Organic aerosols are the main components 10

Aerosols: Absolute contributions winter summer 11

Aerosols : Modelled Composition of SOA winter 2006 (Zurich) AROM ISP TRP SQT POLB POLA summer 2006 (Payerne) : SOA from toluene and xylene : SOA from isoprene : SOA from monoterpenes : SOA from sesquiterpenes : oligomerized SOA from biogenic species (ISP, TRP) : oligomerized SOA from anthropogenic species (AROM 12

Acknowledgements BAFU, ENVIRON, EMPA/NABEL, INFRAS, Meteo. Swiss, Meteotest, FUB, TNO, UBA, ACCENT, M. Schultz, M. R. Alfarra 13

Emission Inventories Anthropogenic emissions Europe Lombardy Switzerland UBA/FUB/TNO City. Delta INFRAS, Meteotest, TRACT isoprene grassland temperature dependent) monoterpenes dependent) sesquiterpenes emissions from oak trees, spruce and (irradiation and Biogenic emissions Nitrogen oxide from conifers (temperature 10% of monoterpene from soils 14

Chemistry in CAMx Gas-phase chemistry §CB 05 mechanism : 156 reactions, 90 species §SAPRC 99 mechanism: 217 reactions, 77 species Aerosol Chemistry §Aqueous sulfate and nitrate formation RADM §Partitioning of condensable organic gases to secondary organic aerosols SOAP (7 SOA classes) §Partitioning of inorganic aerosol constituents ISORROPIA §Oligomerization Size distribution fine/coarse or sectional 15

Anthro Emiss Updated SOA module in CAMx Toluene Xylene TOLA XYLA Y 1 a Y 2 a Y 1 b Y 2 b Biogenic Emission Model Oxygenated semi-volatile organic compounds Isoprene ISP TRP SOA 1 FPOLY c*2 SOA 2 CG 3 c*3 SOA 3 CG 4 c*4 SOA 4 CG 5 c*5 SOA 5 CG 6 c*6 SOA 6 CG 2 Y 3 Y 4 Monoterpenes CG 1 c*1 SOPA Y 5 Y 6 FPOLY Sesquiterpenes SQT Y 7 CG 7 c*7 SOA 7 SOPB 16