Multi-wavelength optical measurement to enhance thermal/optical analysis for carbonaceous aerosol

被引：110

作者：

Chen, L. -W. A. ^{[1
,2
,3
]}

Chow, J. C. ^{[2
,3
]}

Wang, X. L. ^{[2
]}

Robles, J. A. ^{[2
]}

Sumlin, B. J. ^{[2
]}

Lowenthal, D. H. ^{[2
]}

Zimmermann, R. ^{[4
]}

Watson, J. G. ^{[2
,3
]}

机构：

[1] Univ Nevada, Dept Environm & Occupat Hlth, Las Vegas, NV 89154 USA

[2] Desert Res Inst, Div Atmospher Sci, Reno, NV 89512 USA

[3] Chinese Acad Sci, Inst Earth Environm, SKLLQG, Key Lab Aerosol Sci & Technol, Xian, Peoples R China

[4] Univ Rostock, Inst Chem, Chair Analyt Chem, Joint Mass Spectrometry Ctr, D-18055 Rostock, Germany

来源：

ATMOSPHERIC MEASUREMENT TECHNIQUES | 2015年 / 8卷 / 01期

基金：

美国国家科学基金会;

关键词：

LIGHT-ABSORPTION MEASUREMENTS; ELEMENTAL CARBON; BLACK CARBON; ORGANIC-CARBON; BROWN CARBON; SOURCE APPORTIONMENT; SAMPLING ARTIFACTS; UNITED-STATES; INSTRUMENT; IMPROVE;

D O I：

10.5194/amt-8-451-2015

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

A thermal/optical carbon analyzer equipped with seven-wavelength light source/detector (405-980 nm) for monitoring spectral reflectance (R) and transmittance (T) of filter samples allowed "thermal spectral analysis (TSA)" and wavelength (lambda)-dependent organic-carbon (OC)-elemental-carbon (EC) measurements. Optical sensing was calibrated with transfer standards traceable to absolute R and T measurements, adjusted for loading effects to report spectral light absorption (as absorption optical depth (tau(a,lambda))), and verified using diesel exhaust samples. Tests on ambient and source samples show OC and EC concentrations equivalent to those from conventional carbon analysis when based on the same wavelength (similar to 635 nm) for pyrolysis adjustment. TSA provides additional information that evaluates black-carbon (BC) and brown-carbon (BrC) contributions and their optical properties in the near infrared to the near ultraviolet parts of the solar spectrum. The enhanced carbon analyzer can add value to current aerosol monitoring programs and provide insight into more accurate OC and EC measurements for climate, visibility, or health studies.

引用

页码：451 / 461

页数：11

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