摘要
拉萨作为一个典型的高原城市,研究其空气污染的变化对其他高原型城市具有一定借鉴意义。对拉萨市2001年~2012年的逐日污染指数时间序列进行一维连续Morlet小波变换分析,结果表明：拉萨市的PM10污染指数在不同的时间尺度上有＂冬高夏低＂变化规律,每年的12月~次年3月是污染的高峰期,夏季集中的降水对空气中PM10污染物有很好的净化作用。分析了不同时间尺度下污染指数的变化规律,得出波动变化的主周期为290d左右,近几年波动幅度有逐渐减弱的趋势。
As a typical plateau city,studying the air pollution changes of Lhasa has a great significance to other plateau cities.Based on the time series of daily pollution index during 2001 to 2012 of Lhasa city,the one-dimensional continuous Morlet wavelet transform was analysed. The results showed thatthe variations of PM10 pollution index in different time scales of Lhasa City presented high in winter and low in summer. The peak of pollution was between December and next March,and concentrated precipitation in summer has a good function of cleaning the PM10 pollutants in the air. The air pollution index variations in different time scales were analyzed. The main fluctuation period is about 290 days,and fluctuation range was gradually weakening.
出处
《四川环境》
2015年第2期52-58,共7页
Sichuan Environment
