Aerosol Composition in Los Angeles During the 2010 CalNex Campaign Studied by High Resolution Aerosol Mass Spectrometry CalNex Data Analysis Workshop,

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Presentation transcript:

Aerosol Composition in Los Angeles During the 2010 CalNex Campaign Studied by High Resolution Aerosol Mass Spectrometry CalNex Data Analysis Workshop, May 16 th – 19 th 2011, Sacramento Patrick L. Hayes 1,2, Amber M. Ortega 1,3, Michael J. Cubison 1,2, Weiwei Hu 4, Darin W. Toohey 3, James H. Flynn 5, Barry L. Lefer 5, Sergio Alvarez 5, Bernhard Rappenglück 5, James D. Allan 6, John S. Holloway 1,7, Jessica B. Gilman 1,7, William C. Kuster 7, Joost A. de Gouw 1,7, Paola Massoli 8, Xiaolu Zhang 9, Rodney J. Weber 9, Ashley Corrigan 10, Lynn M. Russell 10, Jose L. Jimenez 1,2 (1)CIRES, Boulder, USA; (2) Department of Chemistry and Biochemistry, University of Colorado, Boulder, USA; (3) Department of Atmospheric and Oceanic Science, University of Colorado, Boulder, USA; (4) College of Environmental Sciences and Engineering, Peking University, China; (5) Department of Earth and Atmospheric Sciences, University of Houston, USA; (6) National Centre for Atmospheric Science, The University of Manchester, UK; (7) NOAA, Boulder, USA; (8) Aerodyne Research Inc., Billerica, USA; (9) Georgia Institute of Technology, Atlanta, USA; (10) Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA.

Chemical Composition of PM 1 Aerosols for Pasadena Build up of organic aerosol concentrations over a period of several days. Residual organic aerosols and precursor species in the Pasadena area appear to undergo multiple days of aging. Organic Nitrate Sulfate Ammonium Black Carbon Chloride

Chemical Composition of Non-Refractory PM 1 Aerosols for Pasadena Diurnal Average (6/3 – 6/9): Organic diurnal trend consistent with transport times from source-rich western basin and the expected timescale of secondary production. Nitrate diurnal trend influenced by dilution due to rising planetary boundary layer and evaporation of ammonium nitrate.

Positive Matrix Factorization (PMF): Time Series & Mass Spectra (LV-OOA) (SV-OOA) (LOA) (HOA-ND) (HOA-D) PMF Background: Ulbrich et al. Atmos. Chem. Phys. 2009, 9, Diesel Hydrocarbon-like Organic Aerosol (HOA-D) Non-Diesel Hydrocarbon-like Organic Aerosol (HOA-ND) Semi-Volatile Oxygenated Organic Aerosol (SV-OOA) Low-Volatility Oxygenated Organic Aerosol (LV-OOA) Local Organic Aerosol (LOA)

Positive Matrix Factorization (PMF): Time Series & Mass Spectra (LV-OOA) (SV-OOA) (LOA) (HOA-ND) (HOA-D) PMF Background: Ulbrich et al. Atmos. Chem. Phys. 2009, 9, Diesel Hydrocarbon-like Organic Aerosol (HOA-D) Non-Diesel Hydrocarbon-like Organic Aerosol (HOA-ND) Semi-Volatile Oxygenated Organic Aerosol (SV-OOA) Low-Volatility Oxygenated Organic Aerosol (LV-OOA) Local Organic Aerosol (LOA)

Diesel Hydrocarbon-like Organic Aerosol (HOA-D) Non-Diesel Hydrocarbon-like Organic Aerosol (HOA-ND) Semi-Volatile Oxygenated Organic Aerosol (SV-OOA) Low-Volatility Oxygenated Organic Aerosol (LV-OOA) Local Organic Aerosol (LOA) Positive Matrix Factorization (PMF): Time Series & Mass Spectra

O x (O 3 + NO 2 ) vs OOA Slope of OOA vs. Ox plot is steeper for Pasadena in comparison to Riverside (SOAR-1). The OOA vs. Ox slope is similar to that found in Mexico City for less aged aerosol (MILAGRO). Reference for OOA vs. Ox plots: Herndon et al. Geophys. Res. Lett. 2008, 35, L Wood et al. Atmos. Chem. Phys. 2010, 10, 8947.

Comparison of HOA Components with Combustion Emission Tracers Gasoline Dominated Diesel Dominated More-Diesel Influenced Less-Diesel Influenced

Taken from: Zhang et al. Geophys. Res. Lett. 2007, 34, L13801 Positive Matrix Factorization (PMF): Time Series & Campaign Averages LV-OOA SV-OOA HOA-D HOA-ND LOA

Evolution of Org/  CO 30 Taken From: Dzepina et al. Atmos. Chem. Phys. 2009, 9, Mexico City: Kleinman et al. (2008) de Gouw et al. (2008) Dzepina et al. (2009)

Evolution of Org/  CO 30 Taken From: Dzepina et al. Atmos. Chem. Phys. 2009, 9, Mexico City: Pasadena: For 6/2 -6/6 30 HOA SOA from previous day? Kleinman et al. (2008) de Gouw et al. (2008) Dzepina et al. (2009)

Organic Aerosol Elemental Composition from High Resolution AMS data HR-ToF-AMS Elemental Analysis Background: Aiken et al. Anal. Chem. 2007, 79, 8350.

The Van Krevelen Diagram, Pasadena vs. Riverside Reference for Van Krevelen Diagrams: Heald et al. Geophys. Res. Lett. 2010, 37, L A shallower slope significantly less than -1 for Pasadena could be due to a greater tendency for alcohol addition, or C-C bond breaking (fragmentation) reactions during aerosol aging. Alternatively, slope may be due to different mixing of primary and secondary organic aerosol components.

The Van Krevelen Diagram, Pasadena vs. Riverside Reference for Van Krevelen Diagrams: Heald et al. Geophys. Res. Lett. 2010, 37, L A shallower slope significantly less than -1 for Pasadena could be due to a greater tendency for alcohol addition, or C-C bond breaking (fragmentation) reactions during aerosol aging. Alternatively, slope may be due to different mixing of primary and secondary organic aerosol components.

Thermodenuder + AMS and Volatility Distributions Total OA: POA (using C 4 H 9 as surrogate): Method From: Faulhaber et al. Atmos. Meas. Tech. 2009, 2, 15.

Acknowledgements Funding: CalNex Pasadena Ground-Site Team & CalNex Scientific Community

Back-Up

HOA-D vs. Black Carbon, ‘HOA-D + HOA-ND’ vs. CO(g) Slope = 1.25 Slope = 1.41 Mexico City Slope = 5.71 Slope = 3.33 Me Mexico City

O x (O 3 + NO 2 ) vs SV-OOA, Back-Up

f44 vs. f43 plot (with PMF Results)

AMS Comparison with SMPS, UHSAS (Part 1)

AMS Comparison with SMPS, UHSAS (Part 2)

AMS Comparison with SMPS, UHSAS (Part 3)

Calculated Mie Scattering vs. CAPS (Part 1)

Calculated Mie Scattering vs. CAPS (Part 2)

AMS OM vs. Sunset Online OC Online Sunset OC data was corrected by multiplying the data by This value was calculated from correlation plots of online and HiVol OC data. Without this correction the (AMS OM):(online OC) is unrealistically high.

Comparison of AMS OM vs FTIR OM (Russell Group UCSD)

Comparison Plots: TAG-AMS OM (Aerodyne) vs. AMS OM (Univ. CO.)

Comparison Weekday vs. Sunday – HOA Components & Tracers References on Weekday/Weekend Effect in LA-area: Millstein et al. Atmos. Environ. 2008, 42, 632. Marr et al. Atmos. Environ. 2002, 36, Solid – Mean Dashed – Median