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    National Tsing Hua University Institutional Repository > 原子科學院  > 生醫工程與環境科學系 > 期刊論文 >  The effects of synoptical weather pattern and complex terrain on the formation of aerosol events in the Greater Taipei area

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/61831

    Title: The effects of synoptical weather pattern and complex terrain on the formation of aerosol events in the Greater Taipei area
    Authors: Chuang MT;Chiang PC;Chan CC;Wang CF;Chang EE;Lee CT
    教師: 王竹方
    Date: 2008
    Publisher: Elsevier
    Relation: SCIENCE OF THE TOTAL ENVIRONMENT, Volume: 399, Issue: 1-3, Pages: 128-146
    Keywords: atmospheric aerosols
    aerosol properties
    aerosol event
    synoptical weather pattern
    complex terrain
    Abstract: The aerosol in the Taipei basin is difficult to transport outward under specific weather patterns owing to complex terrain blocking. In this study, seven weather patterns are identified from synoptic weather maps for aerosol events, which occur-red from March 2002 to February 2005. Among the identified weather patterns, High Pressure Peripheral Circulation (HPPC), Warm area Ahead of a cold Front (WAF), TYPhoon (TYP), Pacific High Pressure system stretching westerly (PHP), Weak High Pressure system (WHP), and Weak Southern Wind (WSW) are related to terrain blocking. The remaining pattern is High Pressure system Pushing (HPP). The classification of the pollution origin of the air masses shows that 15% of event days were contributed by long-range transport (LRT), 20% by local pollution (LP), and 65% by LRT/LP mix. Terrain blocking causes aerosol accumulation from high atmospheric stability and weak winds occurring under HPPC, TYP, and PHP weather patterns when the Taipei basin is situated on the lee side of the Snow Mountains Chain (SMC). Terrain blocking also occurs when the Taipei basin is situated on the upwind of SMC and Mt. Da-Twen under WAF and WSW patterns.

    To study the variation of aerosol properties under the mixed influence of terrain and pollution origin, we conducted a field observation simultaneously at the urban, suburban, and background sites in the Greater Taipei area from April 14 to 23, 2004. Terrain blocking plays an important role in aerosol accumulation in the stagnant environment when the Taipei basin is on the lee side of SMC. On the other hand, the PM2.5 sulfate level is stable with a fraction of 30% in PM2.5 during the observation period at the urban (25%-33%) and background (25%-41%) sites. It indicates that background PM2.5 sulfate is high on the West Pacific in winter.
    URI: http://www.elsevier.com/
    Appears in Collections:[生醫工程與環境科學系] 期刊論文

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