IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
Wintertime particulate pollution episodes in anurban valley of the Western US: a case study
Chen,LWA(Chen,L.-W. A.)[1,2]; Watson,JG(Watson,J.G.)[1,2]; Chow,JC(Chow.J.C.)[1,2]; Green,MC(Green,M.c.)[1]; Inouye,D(Inouye,D)[3]; Dick,K(Dick,K.)[3]
Source PublicationAtmospheric Chemistry and Physics
AbstractThis study investigates the causes of elevated PM2.5 episodes and potential exceedences of the US National Ambient Air Quality Standards (NAAQS) in Truckee Meadows, Nevada, an urban valley of the Western US, during winter 2009/2010, an unusually cold and snowy winter. Continuous PM2.5 mass and time-integrated chemical speciation data were acquired from a central valley monitoring site, along with meteorological measurements from nearby sites. All nine days with PM2.5 > 35 µg m−3 showed 24-h average temperature inversion of 1.5–4.5 ◦C and snow cover of 8–18 cm. Stagnant atmospheric conditions limited wind ventilation while highly reflective snow cover reduced daytime surface heating creating persistent inversion. Elevated ammonium nitrate (NH4NO3) and water associated with it are found to be main reasons for the PM2.5 exceedances. An effective-variance chemical mass balance (EV-CMB) receptor model using locally-derived geological profiles and inorganic/organic markers confirmed secondary NH4NO3 (27– 37 %), residential wood combustion (RWC; 11–51 %), and diesel engine exhaust (7–22 %) as the dominant PM2.5 contributors. Paved road dust and de-icing materials were minor, but detectable contributors. RWC is a more important source than diesel for organic carbon (OC), but vice versa for elemental carbon (EC). A majority of secondary NH4NO3 is also attributed to RWC and diesel engines (including snow removal equipment) through oxides of nitrogen (NOx) emissions from these sources. Findings from this study may apply to similar situations experienced by other urban valleys.
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Document Type期刊论文
Corresponding AuthorChen,LWA(Chen,L.-W. A.)[1,2]
Affiliation1.Division of Atmospheric Sciences, Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512, USA;
2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences,Xi’an, China;
3.Washoe County District Health Department Air Quality Management Division, Reno, NV, USA
Recommended Citation
GB/T 7714
Chen,LWA,Watson,JG,Chow,JC,et al. Wintertime particulate pollution episodes in anurban valley of the Western US: a case study[J]. Atmospheric Chemistry and Physics,2012,12:10051-10064.
APA Chen,LWA,Watson,JG,Chow,JC,Green,MC,Inouye,D,&Dick,K.(2012).Wintertime particulate pollution episodes in anurban valley of the Western US: a case study.Atmospheric Chemistry and Physics,12,10051-10064.
MLA Chen,LWA,et al."Wintertime particulate pollution episodes in anurban valley of the Western US: a case study".Atmospheric Chemistry and Physics 12(2012):10051-10064.
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