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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
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 13 (2011) |
Datensatznummer |
250046070
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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 |
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