广州南沙区O_3浓度变化及其与气象因子的关系

Analysis on the change of ozone concentration in Nansha district of Guangzhou and it relationship with meteorological factors

利用广州南沙区气象探测基地2010年O3浓度和常规气象观测资料,分析了O3浓度变化特征及其气象因子的关系。结果表明,广州南沙区2010年O3浓度最高时均值的最大值出现在8月,超标时数最多的是9月;O3浓度日变化呈单峰型分布,O3浓度日变化最大的季节是秋季,其次为夏季、春季、冬季;O3浓度呈现秋季>春季>夏季>冬季的变化特征。气温、相对湿度、日照时数和云量与O3浓度相关系数大,是影响南沙O3浓度的主要气象因子。秋季O3浓度高,O3主要以局地光化学反应生成为主;春季、夏季和冬季O3主要以外来源的输送为主。气团后向轨迹分析表明南沙区秋季气团主要来自污染的大陆地区,春季、夏季和冬季气团主要是来自东南沿海附近或较为清洁的南海。

Base on the O3 concentration and meteorological data collected in 2010 at Nansha meteorological ob servation base, the variation characteristics of O3 concentration and it relationship with meteorological factors are re- searched. The results show that the maximum hourly average O3concentration was found in August and the most ex- cessive hours were found in September. The diurnal variation of O3 was distributed in mono-peak pattern. The diurnal changes was biggest in autumn, which was followed by summer, spring and winter, the seasonal change of ozone was autumn〉spring〉summer〉winter. Temperature, relative humidity, cloud cover are the main meteorological factors that influenceO3concentration. O3 concentration is the highest in autumn when O3 was mainly produced by local pho- tochemistry reaction; ozone in spring, summer and winter was mainly transportation from outside. Backward trajecto- ry analysis shows that in the autumn air-mass is mainly from the continent, while in the spring, summer and winter, air-mass is mainly from the southeastern coast or relative clean South China sea.