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Determination of physical and chemical properties of the aerosol from 1972 to 1982 at a north-alpine pure air station at 1780 m a.s.l. Part III - aerosol size spectra

: Sladkovic, R.; Carnuth, W.; Reiter, R.

Archives for meteorology, geophysics, and bioclimatology. Series B (1984), Nr.35, S.170-201 : Abb.
ISSN: 0066-6424
Fraunhofer IFU; 2002 in Helmholtz-Gesellschaft integriert

Since 1970, measurements of aerosol spectra have been and are being by our institute simultaneously at three stations. We report here on results of the first 11 years, a total of 1500 expositions being available per station. Measurements were made at the northern edge of the Alps, about 90 km south of Munich, at the valley station Garmisch-Partenkirchen (740 m a.s.l.), on the neighboring Wank peak (1780 m a.s.l.) and the peak of the nearby Zugspitze (2964 m a.s.l.). The measurements were performed by means of a fivefold double-stage impactor after Junge-Jaenicke. Two series-connected impactors with equal slit-width form one unit and each of the five impactor pairs is exposed separately at optimum air flow, corresponding to the slith width. This system of five separate units offers the essential advantage that the impactors for fine particles can be operated with short exposure time which can, however, be extended for impactors for coarser particles. Thereby a homogeneous and optimum de position is achieved for counting the separated particles on the microscope slides. Theoretical bases are explained. The particles deposited on the microscope slide are counted by an automatic microscope image analyzer, being computer-controlled and permitting automatic scanning of particle traces on the slides. (IFU)