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Chemical Characterization of CCN and IN in Tropospheric Research

Explore the chemical properties of carbonaceous aerosols and their influences on cloud condensation nuclei and ice nuclei formation, utilizing advanced instrumentation and collaboration with research centers.

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Chemical Characterization of CCN and IN in Tropospheric Research

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  1. VI-ACI2007 WP L4: Chemical Characterization of CCN and IN Thomas F. Mentel Astrid Kiendler-Scharr, and Andreas Wahner Institute for Chemistry and Dynamics of the Geospere Institute 2: Troposphere Research Center Jülich

  2. Work Package L4: Milestones VI-ACI2007 WP L4: Chemical Characterization of CCN and IN • Milestones WP L4 • MS L4A Chemical characterisation of particles at AIDA (ICG-II, Uni-MZ, month 24) • MS L4B Chemical characterisation of particles at LACIS (IfT, ICG-II, Uni-MZ, month 24) • MS L4C Process understanding for in-situ coating of pre-existing CCN and IN assessed (ICG-II, month 30) • MS L4D Couple ZINC chamber to mass spectrometers (ETH, Uni-MZ, month 24)

  3. Instrumentation VI-ACI2007 The Jülich Travel Package PTR-MS Reactive VOC Organic Vapors Density Shape factors Chem. Composition Q-AMS Chem. Composition O/C ratio N/C ratio WToF-AMS

  4. Instrumentation VI-ACI2007 The Jülich Travel Package • Hygroscopicity Tandem - DMA • Master Thesis Angela Buchholz • - RH > 95% • DRH Succinic Acid: 97.5±2% (LACIS 99%) • Humidograms of Oxalic Acid, Oxalates • renew Vaisala's • improve T measurement • DMT CCN Spectrometer • PhD Thesis Angela Buchholz • Test Set up (2006) • Calibration Setup • Compact Set up • (12/2007)

  5. Plant Chamber Jülich: HT-DMA results VI-ACI2007 Hygroscopic Growth Measurement: SOA - 3 Trees

  6. Plant Chamber Jülich: CCN results VI-ACI2007 CCN-Measurement: CCN/CN + Cumulative Size Distribution ss 0.4% ss 0.6% ss 0.8% ss 1.0%

  7. Supersaturation [%] #060516 #060518 early event late event early event late event 0.2 nd nd nd nd 0.4 nd 76±14 nm 90±10 nm 91±8 nm 0.6 50 ±6 nm 63±5 nm 67±4 nm 72±4 nm 0.8 46±3 nm 54±3 nm - 62±3 nm 1.0 43±2 nm 47±1 nm - 57±3 nm Plant Chamber Jülich: CCN results VI-ACI2007 Comparison of Critical Diameters of 2 Events with Pines Compound Classes MT: Monoterpenes SQT: Sesquiterpenes OVOC: Other VOC

  8. On-site cooperations VI-ACI2007 AIDA Chemical Characterization LACIS • close cooperation with Johannes Schneider Uni Mainz • Modification of CCN and IN by inorganic and organic coatings • (LExNO2005) • Q-AMS, WtoF-AMS • HTDMA • CCN-Spectrometer • Modification of CCN and IN properties by SOA components • (SOA2005 and SOA2006) • PTR-MS • Q-AMS, WtoF-AMS • HTDMA • CCN-Spectrometer

  9. PTR-MS: Reactand Product Vapor Scavenging AMS: Particulate Organic Mass and Composition SOA Density ~1.3 g/cm3 On-site Collaboration at AIDA SOA formation – f(T)

  10. On-site cooperations: LACIS VI-ACI2007 AMS at LACIS (IfT): CCN activity of coated soot Non Compacted – Compacted m/z=60 m/z=73

  11. SAPHIR VI-ACI2007 The SAPHIR Chamber at FZ-Jülich Cylindrical shape V=280 m3 SAPHIR geöffnet • Formation and processing of CCN (and IN) • Natural light • Low concentration levels • Long time scales

  12. OH (DOAS) OH, HO2, RO2 LIF NO3 (DOAS) NO, NOX, NOY(chemiluminiscence) O3 (UV absorption) Photolysis rates (spectral photometer, filter radiometer) "Meteorology" (T, P, convection, r.H.) SAPHIR VI-ACI2007 The SAPHIR Chamber Instrumentation • VOCs: • GC/FID • GC-MS • PTR-MS • Aerosols: • UCPC • SMPS • Q-AMS • WToF-AMS • HTDMA • CCN-Spectrometer VI-ACI P/ZINC -> SAPHIR Chamber LACIS field -> SAPHIR Chamber ?!

  13. Chemically Aged Aerosols SAPHIR VI-ACI2007 SOA Formation and Aging in SAPHIR Chamber in Jülich: First Experiments Quantification of aerosol processes on long time scales Climate Isoprene Follow up from AIDA 03/2005 Cloud Formation POM Volume Interaction With Water Vapor Number - CCN Spec. - HTDMA - OPTICAL ?! Pollutants / Nutrients Eco Systems

  14. SAPHIR VI-ACI2007 SAPHIR Chamber in Jülich: Monoterpene Oxidation, SOA Formation and Aging a-Pinene 10/2005 Product and direct OH radical measurements, low ambient concentration range, comparison with gas phase chemistry model PTR-MS SMPS particle size distribution DOAS

  15. SAPHIR VI-ACI2007 a-Pinene + NO3

  16. SAPHIR VI-ACI2007 a-Pinene + NO3 NH4NO3 / HNO3

  17. SAPHIR VI-ACI2007 Comparison of Mass Spectra

  18. HOA and OOA values: Qi Zhang pers. com. SAPHIR VI-ACI2007 Comparison of Mass Spectra isoprene + OH vs. a-pinene + O3

  19. Focus FZJ VI-ACI2007 • Interests of FZJ group: • CCN activity – Precursors and Formation • CCN activity – Chemical Composition • Focus on secondary organic components • CCN activity – Modification by coatings • IN – Modifications by coatings • IN/CCN – Characterization of coatings

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