Local circulation and aerosol water-soluble ions - A case study in Taiwan during Mei-yu season

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题名:	Local circulation and aerosol water-soluble ions - A case study in Taiwan during Mei-yu season
作者:	Lee,CT;Lin,NH;Hsu,WC;Chang,YL;Chang,SY
贡献者:	環境工程研究所
关键词:	PARTICULATE
日期:	1999
上传时间:	2010-06-29 18:21:10 (UTC+8)
出版者:	中央大學
摘要:	The Mei-yu (plum rain) season is a short but important period when the weather changes from spring to summer in Taiwan. In this study, size-segregated aerosols were collected alternately at 5 sampling sites in northwestern Taiwan from June 16 to 24, 1994. For the first time in Taiwan, this study revealed the aerosol mass spectra and water-soluble ions in the Mei-yu season. For all samples, a bi-modal aerosol mass spectra was found with modal diameters at 3.2 and 0.32 mu m, respectively. The aerosol samples were able to be divided into different groups to show their mass and ion spectra according to the calculated 5-hr backward air trajectory. The utilization of enrichment factors showed that aerosol Cl-, Na+, and Mg2+ for all sizes, and super-micron SO42- were related to the sea. Both the scheme of "chlorine loss" (Ohta and Okita, 1990) and a multivariate analysis (Thurston and Spengler, 1985) for categorizing water-soluble ions showed that sea-salts were major contributors in the prevalence of a sea breeze. In contrast, the secondary salts were significant for land breeze and a mix of land-sea breeze. In conclusion, the influence of local circulation on the distribution of aerosol mass and ionic species was found to be prominent. (C) 1998 Elsevier Science Ltd. All rights reserved.
關聯:	CHEMOSPHERE
显示于类别:	[環境工程研究所 ] 期刊論文

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