GSTDTAP  > 地球科学
DOI10.5194/acp-18-2139-2018
Downwind evolution of the volatility and mixing state of near-road aerosols near a US interstate highway
Saha, Provat K.1; Khlystov, Andrey2; Grieshop, Andrew P.1
2018-02-14
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2018
卷号18期号:3页码:2139-2154
文章类型Article
语种英语
国家USA
英文摘要

We present spatial measurements of particle volatility and mixing state at a site near a North Carolina interstate highway (I-40) applying several heating (thermodenuder; TD) experimental approaches. Measurements were conducted in summer 2015 and winter 2016 in a roadside trailer (10m from road edge) and during downwind transects at different distances from the highway under favorable wind conditions using a mobile platform. Results show that the relative abundance of semi-volatile species (SVOCs) in ultrafine particles decreases with downwind distance, which is consistent with the dilution and mixing of traffic-sourced particles with background air and evaporation of semi-volatile species during downwind transport. An evaporation kinetics model was used to derive particle volatility distributions by fitting TD data. While the TD-derived distribution apportions about 20-30% of particle mass as semi-volatile (SVOCs; effective saturation concentration, C* >= 1 mu m(-3)) at 10m from the road edge, approximately 10% of particle mass is attributed to SVOCs at 220 m, showing that the particle-phase semi-volatile fraction decreases with downwind distance. The relative abundance of semi-volatile material in the particle phase increased during winter. Downwind spatial gradients of the less volatile particle fraction (that remaining after heating at 180 degrees C) were strongly correlated with black carbon (BC). BC size distribution and mixing state measured using a single-particle soot photometer (SP2) at the roadside trailer showed that a large fraction (70-80 %) of BC particles were externally mixed. Heating experiments with a volatility tandem differential mobility analyzer (V-TDMA) also showed that the nonvolatile fraction in roadside aerosols is mostly externally mixed. V-TDMA measurements at different dis-tances downwind from the highway indicate that the mixing state of roadside aerosols does not change significantly (e.g., BC mostly remains externally mixed) within a few hundred meters from the highway. Our analysis indicates that a superposition of volatility distributions measured in laboratory vehicle tests and of "background" aerosol can be used to represent the observed partitioning of near-road particles. The results from this study show that exposures and impacts of BC and semi-volatile organics-containing particles in a roadside microenvironment may differ across seasons and under changing ambient conditions.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000425160800003
WOS关键词SECONDARY ORGANIC AEROSOL ; PARTICULATE MATTER EMISSIONS ; LASER-INDUCED INCANDESCENCE ; ALPHA-PINENE OZONOLYSIS ; DUTY GASOLINE VEHICLES ; BLACK CARBON AEROSOL ; THERMODENUDER MEASUREMENTS ; COMBUSTION AEROSOLS ; PARTICLE VOLATILITY ; OPTICAL-PROPERTIES
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/29470
专题地球科学
作者单位1.North Carolina State Univ, Dept Civil Construct & Environm Engn, Raleigh, NC 27695 USA;
2.Desert Res Inst, Div Atmospher Sci, Reno, NV USA
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Saha, Provat K.,Khlystov, Andrey,Grieshop, Andrew P.. Downwind evolution of the volatility and mixing state of near-road aerosols near a US interstate highway[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(3):2139-2154.
APA Saha, Provat K.,Khlystov, Andrey,&Grieshop, Andrew P..(2018).Downwind evolution of the volatility and mixing state of near-road aerosols near a US interstate highway.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(3),2139-2154.
MLA Saha, Provat K.,et al."Downwind evolution of the volatility and mixing state of near-road aerosols near a US interstate highway".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.3(2018):2139-2154.
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