Evaluation of the characteristics of acid precipitation in Taipei, Taiwan using cluster analysis

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题名:	Evaluation of the characteristics of acid precipitation in Taipei, Taiwan using cluster analysis
作者:	Lin,NH;Lee,HM;Chang,MB
贡献者:	大氣物理研究所
关键词:	EASTERN NORTH-AMERICA;SYNOPTIC METEOROLOGICAL CONTROLS;WET DEPOSITION;DEFINE PERIODS;UNITED-STATES;CHEMISTRY;SULFATE;ASIA;RAIN;EMISSIONS
日期:	1999
上传时间:	2010-06-29 18:36:37 (UTC+8)
出版者:	中央大學
摘要:	This work investigated the characteristics of acid precipitation collected in Taipei, Taiwan during 1991-1995 by performing cluster analysis. The extent to which meteorological conditions influence precipitation chemistry was also elucidated. Three potential sources of water-soluble ions in rainwater were identified: seasalt aerosols (Na+, Cl- and Mg2+), anthropogenic pollutants (H+ and NO3-), and mixing sources associated with sulfate (nss-SO42-, NH4+ and Ca2+). As the northeast flow prevailed during the northeast monsoon season, the concentrations of seasalt and sulfate ions in rainwater were significantly high. During that season, a typically high ratio of nss-SO42-/NO3- was also observed, indicating that Taipei might receive foreign pollutants via a long-range transport. In contrast, when the Pacific high dominated the region, nitrate concentration in rainwater was significantly elevated. Also during that period, the ratio of nss-SO42-/NO3- was substantially lower, indicating the prominence of acidic substances contributed by local sources.
關聯:	WATER AIR AND SOIL POLLUTION
显示于类别:	[大氣物理研究所 ] 期刊論文

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