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“Towards the perfect instrument”

Thorsten Hohaus 1 , Andrew Lambe 1 , Brent Williams 5 , Leah Williams 1 , Joel Kimmel 1 , Donna Sueper 1 , Nathan Kreisberg 2 , Gabriel Isaacman 3 , David Worton 2,3 , Allen Goldstein 3,4 , Douglas Worsnop 1 , John Jayne 1 1 Aerodyne Research Inc, Billerica, MA

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“Towards the perfect instrument”

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  1. Thorsten Hohaus1, Andrew Lambe1, Brent Williams5, Leah Williams1, Joel Kimmel1, Donna Sueper1, Nathan Kreisberg2, Gabriel Isaacman3, David Worton2,3, Allen Goldstein3,4, Douglas Worsnop1, John Jayne1 1Aerodyne Research Inc, Billerica, MA 2Aerosol Dynamics Inc., Berkeley, CA 3Dept of Environmental Science, Policy, & Management, UC-Berkeley, Berkeley, CA 4University of California at Berkeley, Department of Civil and Environmental Engineering 5Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis Ambient aerosol measurement during CalNex2010 using a newly developed combined Thermal desorption Aerosol GC (TAG) and Aerodyne Aerosol Mass Spectrometer (AMS) instrument:TAG-AMS

  2. “Towards the perfect instrument” Hallequist et al, ACP, 2009 Thermal desorption aerosol GC/MS (TAG) (Williams et al, AS&T, 2006) + Aerosol Mass Spectrometer (AMS) (Jayne et al, AS&T, 2000) CalNex Data Analysis Workshop

  3. First TAG-AMS field deployment • 4 weeks’ operation • over 2 weeks of continuous measurements CalNex Data Analysis Workshop

  4. TAG-AMS design CalNex Data Analysis Workshop

  5. TAG-AMS CalNex design courtesy of Brent Williams • Measurement cycle (120 min): • 60 min AMS measurements (V-mode) + 60 min TAG sampling, 60 min TAG analysis CalNex Data Analysis Workshop

  6. CalNex Data Analysis Workshop CalNex AMS data sample overview

  7. CalNex Data Analysis Workshop HR-ToF-AMS comparison TAG-AMS bad filament TAG-AMS > CU-AMS, SMPS AMS data provided by Jose Jimenez group

  8. CalNex Data Analysis Workshop HR-ToF-AMS Total Aerosol Mass

  9. HR-ToF-AMS comparison CalNex Data Analysis Workshop

  10. HR-ToF-AMS comparison CalNex Data Analysis Workshop

  11. CalNex Data Analysis Workshop HR-ToF-AMS PMF

  12. CalNex Data Analysis Workshop HR-ToF-AMS PMF

  13. CalNex Data Analysis Workshop HR-ToF-AMS PMF

  14. CalNex Data Analysis Workshop CalNex chromatogram

  15. CalNex Data Analysis Workshop Compound Specific Time Trends

  16. CalNex Data Analysis Workshop Compound Specific Time Trends

  17. CalNex Data Analysis Workshop HR analysis of TAG data m/z 44, m/z 57 are distinctive tracers for OOA, HOA m/z 57 ion fragment is dominated by C4H9+ (HOA) non-negligible oxygenated Fragment C3H5O+ (OOA) Aiken et al., ACP 2009

  18. CalNex Data Analysis Workshop HR analysis of TAG data

  19. CalNex Data Analysis Workshop HR analysis of TAG data

  20. CalNex Data Analysis Workshop HR analysis of TAG data

  21. CalNex Data Analysis Workshop HR analysis of TAG data

  22. CalNex Data Analysis Workshop HR ion Time Trends

  23. CalNex Data Analysis Workshop HR ion Time Trends

  24. Summary & Outlook • Standalone automated TAG-AMS measurements • Very good agreement with CU-AMS • TAG Analysis tool will be further developed/improved • Technical improvements / modularize • CTD cell, GC oven, control unit, TAG-AMS interface • → BEACHON 2011 • PMF analysis • TAG compounds & retention time & AMS HOA,OOA • Extend to High Resolution analysis (PMF & H/C,O/C ratios) • Comparisons • HR analysis of CU AMS and TAG-AMS • Filter and TAG-AMS comparison CalNex Data Analysis Workshop

  25. Acknowledgment • Thanks for support and hosting: • California’s Air Resources Board (CARB) and the California Institute of Technology • Support by the U.S. Department of Energy (DOE), Grant. No. DE-FG02-08ER85160 • Thanks to: • Manjula Canagaratna (PMF) • Jose Jimenez group and Allen Goldsteins group for data and discussions • Thank you for your atttention! CalNex Data Analysis Workshop

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