Characterization of organic ambient aerosol during MIRAGE 2006 on three platforms

被引：89

作者：

Gilardoni, S. ^{[1
]}

Liu, S. ^{[1
]}

Takahama, S. ^{[1
]}

Russell, L. M. ^{[1
]}

Allan, J. D. ^{[2
]}

Steinbrecher, R. ^{[3
]}

Jimenez, J. L. ^{[4
]}

De Carlo, P. F. ^{[4
]}

Dunlea, E. J. ^{[4
]}

Baumgardner, D. ^{[5
]}

机构：

[1] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA

[2] Univ Manchester, Sch Earth Atmospher & Environm Sci, Natl Ctr Atmospher Sci, Manchester, Lancs, England

[3] Karlsruhe GmbH IMK IFU, Forschungszentrum, Inst Meteorol & Climate Res, Karlsruhe, Germany

[4] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA

[5] Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Mexico City 04510, DF, Mexico

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2009年 / 9卷 / 15期

关键词：

PARTICLE-BEAM COLLIMATION; PARTICULATE AIR-POLLUTION; BIOMASS BURNING AEROSOLS; MEXICO-CITY; HIGH-RESOLUTION; CHEMICAL-COMPOSITION; SOURCE APPORTIONMENT; MASS-SPECTROMETER; NUMERICAL CHARACTERIZATION; DICARBOXYLIC-ACIDS;

D O I：

10.5194/acp-9-5417-2009

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 mu g m(-3) at SIMAT, 6.6 mu g m(-3) at Altzomoni, and 5.7 mu g 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.

引用

页码：5417 / 5432

页数：16

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