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| Titel |
Characterization of organic ambient aerosol during MIRAGE 2006 on three platforms |
| VerfasserIn |
S. Gilardoni, S. Liu, S. Takahama, L. M. Russell, J. D. Allan, R. Steinbrecher, J. L. Jimenez, P. F. Carlo, E. J. Dunlea, D. Baumgardner |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 15 ; Nr. 9, no. 15 (2009-08-03), S.5417-5432 |
| Datensatznummer |
250007550
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| Publikation (Nr.) |
 copernicus.org/acp-9-5417-2009.pdf |
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| Zusammenfassung |
| Submicron atmospheric aerosol particles were collected during the Megacity
Initiative: Local and Global Research Observation (MILAGRO) in March 2006 at
three platforms located in the Mexico City urban area (at the Mexico City
Atmospheric Monitoring System building – SIMAT), at about 60 km south-east
of the metropolitan area (Altzomoni in the Cortes Pass), and on board the
NCAR C130 aircraft. Organic functional group and elemental composition were
measured by FTIR and XRF. The average organic mass (OM) concentration,
calculated as the sum of organic functional group concentrations, was
9.9 μg m−3 at SIMAT, 6.6 μg m−3 at Altzomoni, and
5.7 μg m−3 on the C130. Aliphatic saturated C-C-H and carboxylic
acid COOH groups dominated OM (more than 60%) at the ground sites. On the
C130, a non-acid carbonyl C=O, carboxylic acid COOH, and amine NH2
groups were observed in concentrations above detection limit only outside the
Mexico City basin. From the elemental composition of SIMAT samples, we
estimated the upper bound of average contribution of biomass burning to the
organic carbon (OC) as 33–39%. The average OM/OC ratio was 1.8 at SIMAT,
2.0 at Altzomoni, and 1.6–1.8 on the C130. On the aircraft, higher OM/OC
ratios were measured outside of the Mexico City basin, north of the urban
area, along the city outflow direction. The average carboxylic acid to
aliphatic saturated ratio at SIMAT reflected a local increase of oxidized
functional group concentration in aged particles. |
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