基于Matlab小波分析的南京北郊大气O3浓度变化特征研究

以2008年南京北郊大气中O₃ 质量浓度观测资料和常规观测资料为基础，利用Matlab小波分析工具，对O₃浓度的年时间序列进行分析，得出该地区的O₃ 日均浓度的变化特征：春、夏季节O3浓度大于秋、冬季节，最高浓度出现在春末夏初，最低浓度出现在冬季；并且全年共有5个突变点；弱高压的天气系统、较高的温度、较低的湿度和晴朗少云的天气是造成南京北郊O₃浓度突变的主要气象因素。结合HYSPLIT气流后向轨迹模拟，对污染源来源进行追踪，结果表明：南京北郊O₃高浓度污染来源主要分为本地局地污染和外来污染物输送两类；垂直方向上，O₃的区域尺度或中尺度的输送主要稳定在混合层的底层。

Observational study of ozone concentrations in northern suburb of Nanjing based on Matlab wavelet analysis

Based on the O₃ and meteorological data observed in northern suburb of Nanjing in 2008, the time series and the variation characteristics of the daily averaged O₃ was analyzed with a Matlab wavelet method, the results indicated that the O₃ concentration in spring and summer were higher than that in autumn and winter . And the daily maximum and minimum values were presented in late spring to early summer and winter respectively. There were five O₃ concentration mutation points during the whole year.. The mutational variation of the O₃ concentration was caused by the high-pressure system, high temperature, low humidity and the sunny and cloudless climate. The source of the pollutants was studied with a HYSPLIT-4 pollutant dispersion model, the results showed that the pollution source leaded to the higher level of O₃ concentration was mostly come form the local pollutant and transportation of outer pollutant, the transportation of the O₃ in regional scale or mesoscale was mainly stabilized at the bottom of mixing layer in the vertical direction.