A Lagrangian model with simple primary and secondary aerosol scheme 1: comparison with UK PM10 data

[摘要] A Lagrangian trajectory model used to simulate photochemistry has beenextended to include a simple parameterisation of primary and secondaryaerosol particles. The model uses emission inventories of primary particlesfor the UK from the NAEI (National Atmospheric Emissions Inventory for theUK), and for Europe from the TNO (Institute of Environmental Sciences,Energy Research and Process Innovation, the Netherlands) respectively, totransport tracers representing PM₁₀. One biogenic and two anthropogenicorganic compounds were chosen as surrogates to model the formation ofcondensable material suitable for the production of secondary organicaerosol (SOA). The SOA is added to the primary PM₁₀ and compared tomeasured PM₁₀ at one urban and two rural UK receptor sites. The resultsshow an average under-prediction by factors of 4.5 and 8.9 in the urban andrural cases respectively. The model is also used to simulate production oftwo secondary inorganic species, H₂SO₄ and HNO₃, which areassumed, as a limiting case, to be present in the particle phase. Therelationships between modelled and measured total PM₁₀ improved withthe addition of secondary inorganic compounds, and the overall modelunder-prediction factors are reduced to 3.5 and 3.9 in the urban and ruralcases respectively. Nevertheless, our conclusion is that current emissionsand chemistry do not appear to provide sufficient information to modelPM₁₀ well (i.e. to within a factor of two). There is a need for furtherprocess studies to inform global climate modelling that includes climateforcing by aerosol.

[学科分类] 大气科学