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|標題:||Causes of the elevated nitrate aerosol levels during episodic days in Taichung urban area, Taiwan||作者:||Lin, Y.C.
|關鍵字:||Nitrate aerosol;Annular denuder system;High particulate days;Low;particulate days;Formation rate;plume trajectory model;ammonium-nitrate;source/receptor relationship;dissociation-constant;secondary aerosols;primary pollutants;relative-humidity;new-york;pm2.5;quantification||Project:||Atmospheric Environment||期刊/報告no：:||Atmospheric Environment, Volume 44, Issue 13, Page(s) 1632-1640.||摘要:||
The purpose of this study is to explore the possible reasons accounting for elevated nitrate aerosol levels during high particulate days (HPD) in Taichung urban area of central Taiwan. To achieve this goal, simultaneous measurements of particulate and gaseous pollutants were carried out from September 2004 to April 2005 using an annular denuder system (ADS). The formation rate of NO(2) to nitrate aerosol, calculated using the relevant chemical reactions, was employed to interpret enhanced nitrate aerosol concentrations during HPD. The observations showed that nitrate concentration during HPD was 14 times higher than that during low particulate days (LPD). The average formation rate during HPD was 4.0% h(-1), which was 3.1 times higher than that during LPD. The quantitative analysis showed that the formation rate was mainly influenced by temperature and relative humidity. Lower temperature and higher relative humidity led much nitrate aerosol formation in HPD. Moreover, the residence time analysis of air masses staying over the studied area showed that the slow-motion air retained high nitrate concentrations due to more nitrate aerosol converted from the precursors in NOx-rich areas. (C) 2010 Elsevier Ltd. All rights reserved.
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