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Influence of volcanic eruptions on midlatitude upper tropospheric aerosol and consequences for cirrus clouds – Volc Affects S Aerosol in UT and Cirrus

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


The influence of downwelling stratospheric sulfurous aerosol on the UT (upper troposphere) aerosol concentrations and on cirrus clouds is investigated using CARIBIC (Civil Aircraft for Regular Investigation of the Atmosphere Based on an Instrument Container observations) (between 1999–2002 and 2005–2013) and the cirrus reflectance product from Moderate Resolution Imaging Spectroradiometer (MODIS). The initial period, 1999–2002, was volcanically quiescent after which the sulfurous aerosol in the LMS (lowermost stratosphere) (S$_{LMS}$) became enhanced by several volcanic eruptions starting 2005. From 2005 to 2008 and in 2013, volcanic aerosol from several tropical eruptions increased S$_{LMS}$. Due to consequent subsidence, the sulfur loading of the upper troposphere (S$_{UT}$) was increased by a factor of 2.5 compared to background levels. Comparison of SLMS and S$_{UT}$ during the seasons March–July and August–November shows a close coupling of the UT and LMS. Finally, the relationship between S$_{LMS}$ and the cirrus cloud reflectance (CR) retrieved from MODIS spectrometer (on board the satellites Terra and Aqua) is studied. S$_{LMS}$ and CR show a strong anticorrelation, with a factor of 3.5 increase in SLMS and decrease of CR by 8 ± 2% over the period 2001–2011. ... mehr

Volltext §
DOI: 10.5445/IR/1000066046
DOI: 10.1002/2015EA000110
Zitationen: 13
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 2015
Sprache Englisch
Identifikator ISSN: 2333-5084
KITopen-ID: 1000066046
HGF-Programm 12.03.01 (POF III, LK 01) Long term observations of tropospheric
Erschienen in Earth and Space Science
Verlag American Geophysical Union (AGU)
Band 2
Heft 7
Seiten 285–300
Nachgewiesen in Dimensions
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