1 University of California, Davis, CA.

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Presentation transcript:

1 University of California, Davis, CA. Insights from the CARES Campaign in Northern California - Biogenic SOA formation and roles in New Particle Growth Ari Setyan1, Qi Zhang1, M. Merkel2, Y. Sun1, C. Song3, B. Knighton4, T.B. Onasch5, J. Jayne5, D.R. Worsnop5, S. Herndon5, A. Wiedensohler2, J.E. Shilling3, B.A. Flowers6, M.K. Dubey6, D. Vovchuk1 1 University of California, Davis, CA. 2 Leibniz Institute for Tropospheric Research, Leipzig, Germany. 3 Pacific Northwest National Laboratory, Richland, WA. 4 University of Montana, MT. 5 Aerodyne Research Inc., Billerica, MA. 6 Los Alamos National Laboratory, Los Alamos, NM

Carbonaceous Aerosols and Radiative Effects Introduction T0 T1 Carbonaceous Aerosols and Radiative Effects Study Objectives: - To investigate the evolution and aging of carbonaceous aerosols (anthropogenic and biogenic); - To use field data to improve models.

Instrumentation TD – AMS / SMPS Aerodyne HR-ToF-AMS Thermodenuder SMPS Bypass: ambient T Aerosol Inlet PM1 Aerodyne HR-ToF-AMS Nafion dryer Thermodenuder (35 – 200 oC) SMPS CCN counter PILS PM1 composition Size distributions (number and chemical species) Volatility distribution

AMS mass agree well with SMPS volume PM1 density = 1.4 E:\2010.06_CARES\DataTreatment\CARES_parts1_2.pxp AMStotal_vs_SMPSvolume ()

PM1 concentration, composition & size vary dynamically Organics dominate PM1 composition E:\2010.06_CARES\DataTreatment\CARES_parts1_2.pxp TimeSeries_Contribution_3() PieChart_Species() CO2 and O3 data: B. Flowers, M. Dubey

Sulfate and organics are externally mixed, due to different sources and formation mechanisms E:\2010.06_CARES\DataTreatment\CARES_SizeDistr.pxp PToF_SizeDistr()

New particle formation & growth events AAS_Plot_1()

Organics and sulfate are important in new particle growth

PMF analysis of HR spectra T0 data: C. Song ~ Biogenic influenced SOA ~ Urban transport SOA

Biogenic influenced vs urban transport SOA LV-OOA Sally_TrianglePlot_PMF() Sally_TrianglePlot_PMF_2() SV-OOA Ng et al., Atmos Chem Phys, 10 (10), 4625-4641, 2010.

Biogenic influenced vs urban transport SOA CalNex_20110519_C() CalNex_20110519_D PTR-MS data: B. Knighton, S. Herndon

Conclusions Organics (76%) are the major components of PM1. Nucleation events observed almost every day. Both organics and sulfate play a key-role for the new particle growth 3 OA components identified by HR-PMF: OOA-1 (O/C = 0.47): 56%, Urban transport OOA-2 (O/C = 0.41): 32% Biogenic influenced HOA (12%): combustion POA (local + transport) Unique case studies will be performed to study biogenic SOA production, SOA’s role in new particle growth, and transport of urban plumes.

Acknowledgements Financial support: Department of Energy (DOE) Atmospheric Aerosol Health (AAH) program of UC Davis Thank you for your attention Any questions?