秋季珠江口地区海风对城市群空气污染的影响

 根据2004年10月珠江三角洲大气边界层和空气污染物观测资料，分析了位于城市群下风向的珠江口地区的海风对珠江三角洲城市群空气污染的影响。结果表明，秋季珠江口地区海风将抑制城市群空气污染物向下风向输送，而导致城市群空气污染物在向下风向“迁移”过程中“减速”或在城市群短期“堆积”，使城市群空气污染物浓度随海风的出现显著上升，珠江口地区出现海风日城市群空气污染物日平均和日最高浓度与非海风日相比上升了2到4倍；而珠江口地区空气污染物浓度随海风的出现而降低。

Effect of Sea Breeze on Air Pollution of City Clusters in the Pearl River Delta in Autumn

Observational data of atmospheric boundary layer and air pollutant concentration in the Pearl River Delta in October, 2004, were used to analyze the effect of sea breeze on air pollution in cities. Results showed that sea breeze restrained the transportation of air pollutants to the downwind in autumn.It slowed down the transportation of air pollutants to the downwind or caused the temporary accumulation of air pollutants in the city clusters.The concentration of air pollutants in the city clusters increased obviously with the appearence of sea breeze.The mean and the maximum concentrations of air pollutants in the city clusters on sea breeze days increased to two to four times in comparison with no sea breeze days. Sea breeze reduced the concentration of air pollutants in the Mouth of the Pearl River.