梁延刚,胡文志,杨敬基. 2008. 香港能见度、大气悬浮粒子浓度与气象条件的关系[J]. 气象学报, 66(3):461-469, doi:10.11676/qxxb2008.042
香港能见度、大气悬浮粒子浓度与气象条件的关系
A study on the relationship among visibility, atmospheric suspended particulate concentration and meteorological conditions in Hong Kong
投稿时间:2007-03-21  
DOI:10.11676/qxxb2008.042
中文关键词:  能见度, 悬浮粒子PM2.5, 反轨迹, 热带气旋
英文关键词:Visibility, Suspended particulate PM2.5, Backward trajectory, Tropical cyclone
基金项目:
作者单位
梁延刚 香港天文台, 中国香港 
胡文志 香港天文台, 中国香港 
杨敬基 香港天文台, 中国香港 
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中文摘要:
      利用2005年赤鱲角能见度及东涌悬浮粒子 (PM2.5) 浓度的每小时数据,发现PM2.5 浓度与能见度 (撇除雨雾及相对湿度≥95%的个例) 呈倒数关系,相关系数约为0.8。此外,出现低能见度 (能见度低于8 km,而雨雾及相对湿度≥95%的个例不计) 的每月总时数与月平均PM2.5浓度都呈现相类似的季节趋势,即冬季较高,夏季较低。利用HYSPLIT作反轨迹图分析显示这现象跟影响香港的空气来源有关。来自内陆的轨迹中,出现低能见度的日平均时数及日平均PM2.5的浓度,分别远高于来自海洋的轨迹。文中还分析了一个有热带气旋接近本港的个例,论证气象条件对能见度及PM2.5浓度的重要性。
英文摘要:
      By making use of the 2005 hourly data of visibility at Chek Lap Kok and suspended particulate (PM2.5) at Tung Chung, PM2.5 concentration and visibility (excluding cases with mist, fog, rain or relative humidity≥95%) are found to have a reciprocal relationship with a correlation coefficient about 0.8. Besides, similar seasonal trends are exhibited in both the number of hours of reduced visibility (visibility below 8 km and excluding cases with mist, fog, rain or relative humidity≥95%) and PM2.5 concentration, i.e. with higher value attained in winter and lower value in summer. Backward trajectory analysis using HYSPLIT indicates that this phenomenon is related to the source of air mass affecting Hong Kong. For continental trajectories, the average daily occurrence of reduced visibility and the daily mean PM2.5 concentration were much higher than the corresponding occurrence of reduced visibility and mean PM2.5 concentration for maritime trajectories. A case study on an event with a tropical cyclone approaching Hong Kong is included to demonstrate the significance of meteorological conditions in determining the visibility and PM2.5 concentration.
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