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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 1
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)

Abstract:

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


Verlagsausgabe §
DOI: 10.5445/IR/1000066049
Originalveröffentlichung
DOI: 10.3402/tellusb.v66.23428
Scopus
Zitationen: 18
Web of Science
Zitationen: 18
Dimensions
Zitationen: 21
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2014
Sprache Englisch
Identifikator ISSN: 1600-0889, 0280-6509
urn:nbn:de:swb:90-660492
KITopen-ID: 1000066049
HGF-Programm 12.03.01 (POF II, LK 01) Atmosphärische Variabilität und Trends
Erschienen in Tellus / B
Verlag Taylor & Francis Open Access
Band 66
Heft 1
Seiten 23428
Schlagwörter lowermost stratosphere, elemental composition, volcanic aerosol, sulphurous aerosol, carbonaceous aerosol
Nachgewiesen in Scopus
Web of Science
Dimensions
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