Determination of SO2, HNO3, NH3 and aerosol components at a high alpine background site with a filter pack method
1994; Elsevier BV; Volume: 291; Issue: 3 Linguagem: Inglês
10.1016/0003-2670(94)80025-1
ISSN1873-4324
AutoresAnne Kasper‐Giebl, H. Puxbaum,
Tópico(s)Atmospheric Ozone and Climate
ResumoIn the time period from November 1991 to November 1992 measurements of SO2, HNO3, NH3 and particulate SO2−4, NO−3 and NH+4 were conducted at the Sonnblick Observatory in the Austrian Alps. To allow continuous daily measurements a filter pack was used. The precision of the method was checked in respect to the harsh meteorological conditions at the high alpine site and showed acceptable coefficients of variance (< 20%) for particulate matter and nitric acid and slightly higher variations for the gases ammonia (25%) and sulphur dioxide (30%). The annual variations showed large seasonal differences for the aerosol components and for the gases nitric acid and ammonia. Maximum summer/winter ratios were 8, 11 and 17 for the aerosol species NO−3, SO2−4 and NH+4 respectively and 5 for HNO3 and NH3. No marked summer/winter differences could be determined for sulphur dioxide. During winter the absolute concentrations at Mt. Sonnblick were comparable with results reported for measurements of free tropospheric air. In summer a wide scatter of concentrations was determined ranging up to values typically for the planetary boundary layer in remote regions.
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