湄洲湾沿海能见度和大气烟尘污染的变化

On variation of visibility and air pollution in Meizhou Bay

利用1985~2004年能见度和有烟日观测资料,统计分析了20 a当中,湄洲湾沿海能见度和大气受烟尘污染的变化。结果表明：湄洲湾夏季沿海能见度明显好于冬季,这可能与冬夏盛行风向不同,输送排放污染源地不同以及不同季节天气气候条件相关。湄洲湾冬季和夏季沿海能见度呈显著下降趋势,尤以夏季为突出。污染日在86~199d之间徘徊;1985~1988年是污染“轻微期”,年平均污染日101d;1997~2000年是污染“严重期”,年平均污染日达186 d。

Based on visibility and light fog data from 1985 to 2004, the variation of visibility and air pollution by aerosols are studied. The results show that visibility is better in summer than that in winter, which may be caused by different prevailing wind, the transportation of pollutants, and the circulation of atmosphere between winter and summer. Visibility decreases from 1985 to 2004 in Meizhou baywith increasing ofsmoke days. The air pollution occurred about 86 - 199 days in 1985-2004. The mean annual days of air pollution is 101 and 186 days in 1985 to 1988 and 1997 to 2000, respectively. Therefore, the two periods are defined to light and serious air pollution.