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Sources of increase in lowermost stratospheric sulphurous and carbonaceous aerosol background concentrations during 1999–2008 derived from CARIBIC flights

Friberg, Johan; Martinsson, Bengt G.; Andersson, Sandra M.; Brenninkmeijer, Carl A. M.; Hermann, Markus; Van Velthoven, Peter F. J.; Zahn, Andreas

This study focuses on sulphurous and carbonaceous aerosol, the major constituents of particulate matter in the lowermost stratosphere (LMS), based on in situ measurements from 1999 to 2008. Aerosol particles in the size range of 0.08-2 μm were collected monthly during intercontinental flights with the CARIBIC passenger aircraft, presenting the first long-term study on carbonaceous aerosol in the LMS. Elemental concentrations were derived via subsequent laboratory-based ion beam analysis. The stoichiometry indicates that the sulphurous fraction is sulphate, while an O/C ratio of 0.2 indicates that the carbonaceous aerosol is organic. The concentration of the carbonaceous component corresponded on average to approximately 25% of that of the sulphurous, and could not be explained by forest fires or biomass burning, since the average mass ratio of Fe to K was 16 times higher than typical ratios in effluents from biomass burning. The data reveal increasing concentrations of particulate sulphur and carbon with a doubling of particulate sulphur from 1999 to 2008 in the northern hemisphere LMS. Periods of elevated concentrations of particulate sulphur in the LMS are linked to downward transport of aerosol from higher altitudes, using ozone as a tracer for stratospheric air. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000066049
Veröffentlicht am 11.05.2018
DOI: 10.3402/tellusb.v66.23428
Zitationen: 11
Web of Science
Zitationen: 12
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1600-0889, 0280-6509
KITopen-ID: 1000066049
HGF-Programm 12.03.01 (POF II, LK 01)
Erschienen in Tellus / B
Band 66
Heft 1
Seiten 23428
Schlagworte lowermost stratosphere, elemental composition, volcanic aerosol, sulphurous aerosol, carbonaceous aerosol
Nachgewiesen in Web of Science
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