TY  - GEN
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/7967/
ID  - heidok7967
KW  - Schwefeldioxid 
KW  -  Partikelneubildungsulfur dioxide 
KW  -  particle formation
N2  - Aircraft based measurements of tropospheric sulfur dioxide, SO2, have been carried out during four campaigns in South America (TROCCINOX), Australia (SCOUT-O3), Europe (INTEX/MEGAPLUME) and Africa (AMMA). SO2 has been measured by chemical ionization mass spectrometry (CIMS), permanently online calibrated with isotopically labelled SO2. The measurement method is described thoroughly in this work and the measured data are presented. Moreover, the data of the different regions are compared in general and typical air mass situations with SO2 enhancement are shown. A detailed analysis of four SO2 pollution plume cases emphasizes the main features: long-range transport, SO2 from metal smelters/volcanoes or from biomass burning. The SO2 measurements are analyzed in the light of simultaneously measured trace gas, particle and meteorological data. Air mass trajectory models (FLEXPART or HYSPLIT) are employed for a determination of the pollution origin. Further going evaluations with the aerosol model AEROFOR complete the analyses and point out, that the measured SO2 mole fractions are sufficient to explain new particle formation and growth. Finally, a first comparison of the measured SO2 to results from a global circulation model (ECHAM) with implemented sulfur chemistry showed a significant underestimation of the measured SO2 mole fraction by the model in the free troposphere.
Y1  - 2007///
TI  - Atmospheric SO 2 : Global Measurements using Aircraft-Based CIMS
A1  - Fiedler, Verena
AV  - public
ER  -