Spatial and temporal variations of particulate precursor gases and photochemical reaction products during SJVAQS/AUSPEX ozone episodes

被引:30
作者
Chow, JC
Watson, JG
Lowenthal, DH
Egami, RT
Solomon, PA
Thuillier, RH
Magliano, K
Ranzieri, A
机构
[1] Univ Nevada, Desert Res Inst, Reno, NV 89506 USA
[2] Desert Res Inst, Community Coll Syst Nevada, Reno, NV 89506 USA
[3] Pacific Gas & Elect Co, San Ramon, CA 94583 USA
[4] Calif Air Resources Board, Sacramento, CA 95814 USA
关键词
SJVAQS/AUSPEX; secondary aerosols; ozone; precursors;
D O I
10.1016/S1352-2310(97)00449-4
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
SJVAQS/AUSPEX acquired PM2.5, PM10, and gas samples at ten sites in central California during five ozone episodes over a period of 14 intensive sampling days. Four sample sets per day were collected for 5- and 7-hour durations during this period and analyzed for particulate mass, elements, ions, and organic and elemental carbon (OC and EC). Gaseous ammonia, nitric acid, and sulfur dioxide were collected with absorbing filters. Ozone (O-3), nitrogen oxides (NOx), and peroxyacetyl nitrate (PAN) were measured continuously. Concentrations varied by sampling site, time of the day, and ozone episode. The highest concentrations of most chemical species were found at sites in the southern San Joaquin Valley. Nitrate occurred mainly in the gas phase during the daytime when temperatures exceeded 25 degrees C, and in the particulate phase during the nighttime when temperatures decreased to less than 10 degrees C. Significant amounts of nitrate volatilized from particles collected on quartz-fiber filters. Diurnal patterns of ozone, nitrogen oxides, PAN, nitric acid, and total particle citrate were similar at most of the sites, which were separated by hundreds of kilometers, showing evidence of both photochemical conversion and transport of polluted air masses. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2835 / 2844
页数:10
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