 |
| Titel |
Chemical mass balance of 300 °C non-volatile particles at the tropospheric research site Melpitz, Germany |
| VerfasserIn |
L. Poulain, W. Birmili, F. Canonaco, M. Crippa, Z. J. Wu, S. Nordmann, G. Spindler, A. S. H. Prévôt, A. Wiedensohler, H. Herrmann |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 18 ; Nr. 14, no. 18 (2014-09-23), S.10145-10162 |
| Datensatznummer |
250119061
|
| Publikation (Nr.) |
 copernicus.org/acp-14-10145-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| In the fine-particle mode (aerodynamic diameter < 1 μm) non-volatile material has been associated with black carbon (BC) and
low-volatile organics and, to a lesser extent, with sea salt and mineral
dust. This work analyzes non-volatile particles at the tropospheric research
station Melpitz (Germany), combining experimental methods such as a mobility
particle-size spectrometer (3–800 nm), a thermodenuder operating at
300 °C, a multi-angle absorption photometer (MAAP), and an aerosol
mass spectrometer (AMS). The data were collected during two atmospheric
field experiments in May–June 2008 as well as February–March 2009. As a
basic result, we detected average non-volatile particle–volume fractions of
11 ± 3% (2008) and 17 ± 8% (2009). In both periods, BC was
in close linear correlation with the non-volatile fraction, but not
sufficient to quantitatively explain the non-volatile particle mass
concentration. Based on the assumption that BC is not altered by the heating
process, the non-volatile particle mass fraction could be explained by the
sum of black carbon (47% in summer, 59% in winter) and a non-volatile
organic contribution estimated as part of the low-volatility
oxygenated organic aerosol (LV-OOA) (53% in summer, 41% in winter);
the latter was identified from AMS data by factor analysis. Our results
suggest that LV-OOA was more volatile in summer (May–June 2008) than in
winter (February–March 2009) which was linked to a difference in oxidation
levels (lower in summer). Although carbonaceous compounds dominated the
sub-μm non-volatile particle mass fraction most of the time, a
cross-sensitivity to partially volatile aerosol particles of maritime origin
could be seen. These marine particles could be distinguished, however from
the carbonaceous particles by a characteristic particle volume–size
distribution. The paper discusses the uncertainty of the volatility
measurements and outlines the possible merits of volatility analysis as part
of continuous atmospheric aerosol measurements. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|