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Titel Closure field observations and controlled laboratory studies demonstrate chemical aging affects optical and microphysical properties of carbonaceous aerosols significantly
VerfasserIn Manvendra Dubey, Bradley Flowers, Allison Aiken, Claudio Mazzoleni
Konferenz EGU General Assembly 2011
Medientyp Artikel
Sprache Englisch
Digitales Dokument PDF
Erschienen In: GRA - Volume 13 (2011)
Datensatznummer 250046070
 
Zusammenfassung
The direct and indirect radiative forcing by carbonaceous aerosols (black carbon and organics) is significant and uncertain. We will report field observations and laboratory measurements form recent campaigns by our group demonstrating that models substantially underestimate both carbonaceous aerosol abundances (e.g. secondary organic aerosols in Mexico City [1]) and their specific light-absorption (e.g. brown carbon, uv absorption and coating enhancements in the Jeju Korea [2] and the laboratory [3,4]). In addition we will illustrate carbonaceous aerosols are hydrophobic near source regions (e.g. in Houston [5]) and become hydrophilic in the far field (e.g. marine stratus [1]) but the timescales of these transformations are ill-quantified. Our talk will underscore the climatic significance of carbonaceous aerosols and the urgency to elucidate the underlying chemical mechanisms altering carbonaceous aerosol optical and microphysical. I will also discuss how new optical, chemical and microphysical instrument combinations (multi-wavelength photoacoustic, SP2, AMS, HTDMA) in upcoming field campaigns (Ganges Valley Aerosol Experiment in India in 2012), laboratory studies and innovative modeling strategies will accelerate quantitative accurate representations of carbonaceous aerosols in climate models. [1] Herndon S. C-€¦.Mazzoleni, C., Dubey. M. K. et al, Correlation of secondary organic aerosol with odd oxygen in Mexico City, 35, iss.15 L15804 Geophys. Res. Lett. 2008; Mazzoleni C., M. K. Dubey et al in preparation 2010 [2] Flowers B., Dubey, M. K., Mazzoleni C. et al Optical-chemical-microphysical relationships and closure studies for mixed carbonaceous aerosols observed at Jeju Island; 3-laser photoacoustic spectrometer, particle sizing, and filter analysis, Atmos. Chem. and Phy.. 10, 10387-10398, doi:10.5194/acp-10-10387, 2010 [3] Cross, E.,-€¦. Mazzoleni, C„ Dubey, M. K. et al, Soot particle studies – Instrument Intercomparisons Project Overview, Aerosol Sci. & Tech, 44, 8, 592-611, 2010 [4] Chakrabarty, R. K.,-€¦Mazzoleni, C., M. K. Dubey et al.  Brown Carbon in Tar Balls from Smoldering Biomass Combustion, 10, 13, 6373-6370, Atmos. Chem. & Phys., 2010 [5] Lance, S., A. Nenes, C. Mazzoleni, Dubey, M. K. et al, CCN Activity, Closure and Droplet Growth Kinetics of Houston Aerosol During the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) J. Geophys. Res., 114, D00F15, 10.1029/2008JD011699, 2009