1. 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
VI-ACI2007

2. 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)
Work Package L4: Milestones VI-ACI2007

3. 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
Instrumentation VI-ACI2007

4. 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)
Instrumentation VI-ACI2007

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

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

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

8. 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
On-site cooperations VI-ACI2007

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

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

11. 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
SAPHIR VI-ACI2007

12. The SAPHIR Chamber Instrumentation
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.)
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 ?!
SAPHIR VI-ACI2007

13. 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
Chemically Aged
Aerosols
Number
- CCN Spec.
- HTDMA
- OPTICAL ?!
Pollutants / Nutrients
SAPHIR VI-ACI2007
Eco Systems

14. 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
SAPHIR VI-ACI2007

15. a-Pinene + NO3
SAPHIR VI-ACI2007

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

17. Results from the AMS MS-mode
SAPHIR VI-ACI2007

18. Comparison of Mass Spectra
SAPHIR VI-ACI2007

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

20. Comparison of Mass Spectra
HOA and OOA values:
Qi Zhang pers. com.
a-pinene + O3
vs.
a-pinene + NO3
SAPHIR VI-ACI2007

21. 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
Focus FZJ VI-ACI2007