Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-9-6617-2009
http://www.atmos-chem-phys-discuss.net/9/6617/2009/
http://www.atmos-chem-phys-discuss.net/9/6617/2009/acpd-9-6617-2009.html
http://www.atmos-chem-phys-discuss.net/9/6617/2009/acpd-9-6617-2009.pdf
6617
6655
2009-03-10
Characterization of organic ambient aerosol during MIRAGE 2006 on three platforms
S. Gilardoni
L. Shang
S. Takahama
L. M. Russell
J. D. Allan
R. Steinbrecher
J. L. Jimenez
P. F. Decarlo
E. J. Dunlea
D. Baumgardner
Scripps Institution 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
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-west of
the metropolitan area (Altzomoni in the Cortes Pass), and on board the
NSF/NCAR aircraft C130. 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<sup>−3</sup>
at SIMAT, 6.6 μg m<sup>−3</sup> at Altzomoni, and 5.7 μg m<sup>−3</sup> 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, and amine NH<sub>2</sub>
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 plus
non-acid carbonyl to aliphatic saturated ratio was higher at Altzomoni
relative to SIMAT, reflecting a larger average contribution of carbonyl
functional groups (largely in carboxylic acids) at the mountain site.
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