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- W2160172845 abstract "The impact of ambient temperature on the levels and chemical composition of aerosols over the Eastern Mediterranean in July 2004 is investigated using the WRF/CMAQ model system coupled with the MEGAN biogenic emissions model. CMAQ is able to capture the observed mean aerosol concentrations over the studied period. Non-sea-salt sulfate (nss-SO42−) is calculated to be the major aerosol component contributing by 63%, 16% and 40% to the fine (PM2.5), coarse (PM2.5–10) and total particulate matter mass (PM10), respectively. PM2.5 to PM10 mass ratios reach more than 80% over the large urban agglomerations but decrease to 45% at downwind locations suggesting coagulation and condensation on coarse particles. Higher temperatures increase biogenic emissions, enhance spatially-averaged biogenic secondary organic aerosol (SOA, by 0.01 ± 0.00 μg m−3 K−1) and nitrate (NO3−) aerosol concentrations (by 0.02 ± 0.02 μg m−3 K−1). They reduce nss-SO42− (by −0.04 ± 0.07 μg m−3 K−1), induced by significant reduction in the cloud cover (90% K−1) and subsequent aqueous-phase production. The PM2.5 concentrations show a very small positive response to temperature changes, increasing by 0.003 ± 0.042 μg m−3 K−1 (0.04% K−1) due to the compensation of organic carbon increases by nss-SO42− reductions. Locally, larger changes are computed, with nss-SO42− and NO3− in fine aerosols reduced by up to 0.62 μg m−3 K−1 and 0.80 μg m−3 K−1, respectively. Increases as high as 0.097 μg m−3 K−1 and 0.034 μg m−3 K−1 are calculated for organic and elemental carbon, respectively. Results show that changes in temperature modify not only the aerosol mass but also its chemical composition." @default.
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- W2160172845 date "2012-04-01" @default.
- W2160172845 modified "2023-09-30" @default.
- W2160172845 title "Summertime aerosol chemical composition in the Eastern Mediterranean and its sensitivity to temperature" @default.
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- W2160172845 doi "https://doi.org/10.1016/j.atmosenv.2011.12.044" @default.
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