An inter-comparison of two black carbon aerosol instruments and a semi-continuous elemental carbon instrument in the urban environment

被引：47

作者：

Environmental Chemistry and Technology Program, University of Wisconsin - Madison, Madison, WI, United States ^{[1
]}

不详 ^{[2
]}

机构：

[1] Environmental Chemistry and Technology Program, University of Wisconsin - Madison, Madison, WI

[2] Environmental Chemistry and Technology Program, University of Wisconsin - Madison, Madison, WI 53706

来源：

Aerosol Sci. Technol. | 2007年 / 5卷 / 463-474期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1080/02786820701222819

中图分类号：

学科分类号：

摘要：

Aerosol absorption coefficients were obtained using two versions of the Magee Scientific Aethalometer and a Particle Soot Absorption Photometer (PSAP) in Riverside, California during July and August of 2005. These measurements were subsequently compared to each other and to hourly elemental carbon (EC) mass concentrations as determined by a Sunset Labs semi-continuous OCEC analyzer. Measurements from all four instruments were shown to be highly correlated (R2 = 0.83 to 0.92). Differences between absorption values measured by the PSAP and the Aethalometer were found to be dominated by differences in the filter media used by the respective instruments. Comparison of optical and thermal measurements revealed that the specific attenuation cross section (σATN) of light absorbing carbon (LAC) varied as a function of the time of the day, most notably during weekdays. Minimum σATN values were observed during morning rush hour when EC concentrations were at their greatest and maxima were seen in the late afternoon. These variations correlated with changes in the OC/EC ratio and the Angstrom exponent for absorption, which is consistent with changes in the mixing state of elemental carbon associated with secondary aerosol condensation on primary EC particles. Copyright © American Association for Aerosol Research.

引用

页码：463 / 474

页数：11

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