EMEP/MSC-W How can EMEP Intensive measurement periods help to improve modelling of acidification, eutrophication, O3 and PM? Views from MSC-W H. Fagerli and MSC-W team, TFMM, Paris 15-17th June 2009

Large uncertainty – dry deposition fluxes I EMEP/MSC-W Large uncertainty – dry deposition fluxes I The EMEP model is evaluated using wet deposition measurements and concentrations in air, but to have the full budget we need to evaluate the dry deposition. Too high dry deposition would imply too short long range transport: S-R matrices

Large uncertainty – dry deposition fluxes I EMEP/MSC-W Large uncertainty – dry deposition fluxes I What is the reason for the underestimation? Gas-particle distribution? Dry deposition? Vertical distribution of components? ?

Large uncertainty – dry deposition fluxes II EMEP/MSC-W Large uncertainty – dry deposition fluxes II Co-ordination with other European projects (NEU?)? Co-locate measurements of air concentrations to sites where flux measurements are undertaken? (CarboEurope, FluxNet?) Micro meteorology + concentrations would help to evaluate if dry deposition is reasonable

EMEP/MSC-W Vertical profiles To help interpreting processes (dynamic and chemistry)

Import into target regions as compared to domestic contribution NA EU SA EA ns Credibility of model results? Courtesy Michael Schulz

Spatial measurement data coverage EMEP/MSC-W Spatial measurement data coverage Much less data for Mediterrenean and South-East Europe. Could sites that only have partially coverage of the program have additional measurements during the measurement period? Could countries/sites that not report to EMEP be involved for e.g. level 1 type measurements?

SOA and O3 BVOC difficult? Co-operation with other projects? EMEP/MSC-W SOA and O3 BVOC difficult? Co-operation with other projects? Measurements of VOC, possibly co-located with OC/EC and tracers (levoglucosan, 14C) in a summer campaign? Isoprene, terpene ? Products; HCHO, Methyl-vinyl ketone, machroein ?

PM Full chemical speciation (mass closure) Fine versus coarse nitrate EMEP/MSC-W PM Full chemical speciation (mass closure) Dust Fine versus coarse nitrate Gas versus particle phase

What have we learned? NH3 HNO3 NO3- (PM25) Site: Auchencort (GB48) Improving diurnal variation of ammonia emissions helps – but does not solve the problem Site: Auchencort (GB48) NO3- (PM25)

Coarse nitrate in standard EMEP model, june 2006 Dots: measurements Field: EMEP model

New parametrisation of formation of coarse nitrate based (on dust and sea salt) Montelibretti (IT01), june 2006

Wish list Dry deposition Vertical profiles VOC’s Spatial coverage EMEP/MSC-W Wish list Dry deposition Vertical profiles VOC’s Spatial coverage Mass closure (chemical speciation) Coarse versus fine nitrate Gas-particle