中文摘要：

分析处理复杂问题需要抓住主流,以珠三角地区发生的一次典型灰霾天气过程为例讨论了抽丝剥茧的资料分析方法。这次灰霾过程同期20日左右,中亚、蒙古国与我国北方发生了当年沙尘天气影响范围最广的一次强沙尘暴过程,冷空气前锋22日凌晨到达穗港地区,但穗港两地空气质量发生了相反的变化,香港空气质量急剧恶化,气溶胶浓度超过700μg/m3,而珠三角腹地的广州、佛山、东莞的能见度和空气质量明显好转,出现了穗港晴沙两重天的奇观,亦引发了关于这次过程定性的争议。文章从天气分析、流场分析、遥感分析和气溶胶物理特征分析,探讨了这次过程的成因,结论是香港地区从东到西受到了源于浮尘的重度灰霾天气影响,能见度和空气质量急剧恶化,而珠三角腹地受冷空气影响,清除了持续6天的灰霾天气,能见度和空气质量明显好转。

英文摘要：

Taking a typical haze weather occurred in Pearl River Delta region as an example,during the same period of this haze episode,the most extensive sand and dust storm of 2010 occurred in Central Asia,Mongolia and northern China.Cold front reached Hong Kong and Guangzhou on early morning,22 March 2010,resulting opposite impact on air quality at these two cities.Rapid deterioration of air quality in Hong Kong was observed,with the aerosol concentration exceeding 700 μg/m3.However,the quality and visibility of inland part of Pearl River Delta region including Guangzhou,Foshan and Dongguan improved significantly during this period.The opposite event triggered a controversy on the nature of this process.Weather analysis,flow field analysis,remote sensing analysis as well as physical and chemical characteristics of aerosols analysis were performed to discuss the causation of this event.Results indicated that Hong Kong experienced air quality and visibility impairment due to the haze weather caused by dust while Pearl River Delta hinterland region observed end of 5 days haze weather and visibility as well as air quality improvement in virtue of cold front passing by.