Effects of Sources and Meteorology on Ambient Particulate Matter in Austin, Texas

被引：10

作者：

Patel, Kanan ^{[1
]}

Wang, Dongyu ^{[1
]}

Chhabra, Puneet ^{[1
]}

Bean, Jeffrey ^{[1
]}

Dhulipala, Surya Venkatesh ^{[1
]}

Hildebrandt Ruiz, Lea ^{[1
]}

机构：

[1] Univ Texas Austin, McKetta Dept Chem Engn, Austin, TX 78712 USA

来源：

ACS EARTH AND SPACE CHEMISTRY | 2020年 / 4卷 / 04期

关键词：

PM1; source apportionment; positive matrix factorization; meteorology; photochemical formation; new particle formation; SECONDARY ORGANIC AEROSOL; POSITIVE MATRIX FACTORIZATION; AIR-POLLUTANT CONCENTRATIONS; HIGH-RESOLUTION; MASS-SPECTROMETER; ISOPRENE EPOXYDIOLS; PARTICLE FORMATION; SULFURIC-ACID; HUMAN HEALTH; COMPONENTS;

D O I：

10.1021/acsearthspacechem.0c00016

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We measured ambient submicron aerosol at an urban background site in Austin, Texas in June 2018 (summer) and October-November 2014 (fall). We report the NR-PM1 (non-refractory particulate matter with aerodynamic diameter under 1 mu m) concentration, size distribution, and bulk composition measured with a quadrupole-aerosol chemical speciation monitor and a scanning electrical mobility spectrometer. Source apportionment of organic aerosol (OA) using positive matrix factorization (PMF) resolved two oxidized factors, local and regional-OOA, for the summer period and an additional factor, hydrocarbon-like OA (HOA), for the fall period. Differences in the diurnal variation of the local-OOA factor during the two periods and the absence of an HOA factor in the summer indicate that photochemical processing played an important role in governing summer OA composition and diurnal variation. Concentrations of particulate sulfate (SO42-) were higher in summer than fall, which may be due to emissions from cement kilns located upwind of the measurement location under the summer wind conditions. Size distribution data suggest frequent nucleation events in summer afternoons, possibly initiated by SO2 and high photochemical activity, and supported by low particle loading and, therefore, a low condensational sink. Overall, we demonstrate the importance of sources, meteorological conditions, and photochemistry in governing the composition and concentration of PM1 at this urban background site.

引用

页码：602 / 613

页数：12

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