Measuring And Modelling Of Aerosol Chemical Composition For The SANA Intensive Field Campaigns
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W. Seidl, G. Brunnemann, L. Kins, D. Kohler, E. Kohler, K. ReiBwig, K. RouB, Th. Seller & R. Dugli
During the intensive field campaign SANA 2 in August/September 1991, meas- urements of aerosol particles and related gases have been performed. The accu- mulation mode particles showed a diurnal cycle of their chemical composition due to the diurnal cycles of the temperature and relative humidity. Nitrate ap- peared in the accumulation mode particles in dependence on the temperature. During morning sampling periods with easterly winds, potassium has been de- tected in accumulation mode particles which was supposed to be externally mixed with sulfate. Model calculations showed different pH-values and different mass fractions of volatile compounds in the potassium and the sulfate particles.