References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-9-5417-2009

Characterization of organic ambient aerosol during MIRAGE 2006 on three platforms

Gilardoni

¹ ⁶ Liu

¹ Takahama

¹ Russell

L. M.

¹ Allan

J. D.

² Steinbrecher

³ Jimenez

J. L.

⁴ De Carlo

P. F.

⁴ ⁷ Dunlea

E. J.

⁴ Baumgardner

⁵

Scripps Inst. of Oceanography, University of California, San Diego, La Jolla, California, USA

National Centre for Atmospheric Science, School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester, UK

Institute of Meteorology and Climate Research, Forschungszentrum, Karlsruhe GmbH (IMK-IFU), Germany

Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado, USA

Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City, Mexico

now at: Joint Research Center, Institute of Environment and Sustainability, Climate Change Unit, Ispra, Italy

now at: Paul Scherrer Institut, Switzerland

03 08 2009

9 15 5417 5432

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/9/5417/2009/acp-9-5417-2009.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/5417/2009/acp-9-5417-2009.pdf

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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