Indication of aerosol aging by Aethalometer optical absorption measurements Luka Drinovec 1 , Griša Močnik 1 , Irena Ježek 1 , Jean-Eudes Petit 2,3 , Jean Sciare 2 , Olivier Favez 3 , Peter Zotter 4 , Robert Wolf 4 , André S.H. Prévôt 4 , and Anthony D.A. Hansen 1,5 1. Aerosol d.o.o., Kamniška 41, SI-1000 Ljubljana, Slovenia 2. LSCE (CEA-CNRS-UVSQ), Orme des Merisiers, Gif-sur-Yvette, France; 3. INERIS, Verneuil-en-Halatte, France 4. Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland 5. Magee Scientific, 1916A M.L. King Jr. Way, Berkeley, CA 94704, USA Keywords: Aethalometer, source apportionment, ACSM, AMS, PSCF Contact author email: [email protected]Presenting author email: [email protected]ACCENT Symposium 2013, Urbino (Italy)
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Indication of aerosol aging by Aethalometer optical absorption measurements Luka Drinovec 1, Griša Močnik 1, Irena Ježek 1, Jean-Eudes Petit 2,3, Jean.
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Indication of aerosol aging by Aethalometer optical absorption measurements
Luka Drinovec1, Griša Močnik1, Irena Ježek1, Jean-Eudes Petit2,3, Jean Sciare2, Olivier Favez3, Peter Zotter4, Robert Wolf4, André S.H. Prévôt4, and Anthony D.A. Hansen1,5
1. Aerosol d.o.o., Kamniška 41, SI-1000 Ljubljana, Slovenia2. LSCE (CEA-CNRS-UVSQ), Orme des Merisiers, Gif-sur-Yvette, France;
J. Sandradewi et al., A study of wood burning and traffic aerosols in an Alpine valley using a multi-wavelength Aethalometer, Atmospheric Environment (2008) 101–112
Paris site - SIRTA Atmospheric Research Observatory- located in a semi-urban environment- 25 km south of the Paris city center
Site Campaign BC (ng/m3) Biomass burning (%)
Payerne Winter 2013 789 29
Summer 2012 593 10
Paris Winter 2013 968 25
Summer 2012 671 4
Back trajectory analysis
Back trajectory analysis using Potential Source Contribution Function (PSCF)• Represents the probability that an air parcel may be responsible for high
concentrations observed at the receptor site• 72h back trajectories calculated with Hysplit v4.9• starting at 500m AGL
An example:- PSCF analysis of BC- Paris winter 2013
Indentification of source locations
- Angstrom exponent α obtained from AE33 spectral data - PSCF (Back trajectory analysis using Potential Source Contribution Function)
Aerosol mass spectrometers: ACSM & AMS (Aerodyne)-> Aerosol chemical composition is obtained
16.6.2012 23.6.2012 30.6.2012 7.7.20120
2
4
6
8
10
12
Co
nc.
(g
/m3 )
Org NH
4
SO4
NO3
Coating factor (CF) – ratio between the sum of nonrefractory aerosol mass to BC:
CF = (Org + NH4 + SO4 +NO3)/BC
13.6.2012 20.6.2012 27.6.2012 4.7.2012 11.7.20120
5
10
15
20
25
30
(SO 4 +
NH 4 +
OR
G)
/ B
C
0,005
0,004
0,003
0,002
0,001
0,000
-0,001
-0,002
-0,003
k 88
0 n
m
Particle coating hypotesis – summer data
AE33 compensation parameter
ACSM
Paris Summer2012 campaign
Compensation parameter k880nm and coating factor correlate well.
Summary
Spectral absorption data from Aethalometer AE33 was used for BC source apportionment during EMEP campaigns in Paris (France) and Payerne (Switzerland).
Back trajectory analysis using Potential Source Contribution Function (PSCF) was used to determine fossil fuel and biomass burning locations.
PSCF: Aged aerosols have small k880nm
Aethalometer and ACSM/AMS measurements were used for calculation of the coating factor (CF): Big CF = Small k880nm
Acknowledgements
The work described herein was co-financed by the EUROSTARS grant E!4825 and JR-KROP grant 3211-11-000519. Measurements performed at SIRTA (LSCE) were funded by CNRS, CEA, the EU-FP7(2007-2013) 'ATRIS' project under grant agreement n°262254, the Primequal Predit 'PREQUALIF' project (ADEME contract n°1132C0020), and the DIM R2DS (AAP 2010) 'PARTICUL'AIR' project. Measurements in Payerne were conducted by the Swiss Federal Office for the Environment (FOEN).