基于EOF/SVD的2018年湖北省臭氧特征及其高值与气象要素关系研究

基于湖北省2018年4-10月臭氧、温度和相对湿度逐小时监测数据以及50 m风场逐小时再分析数据,采用经验正交函数(EOF)和奇异值分解(SVD)方法,分析了2018年湖北省臭氧特征及其高值与气象要素关系。结果表明:湖北省臭氧日最大8 h浓度距平呈现以武汉为正值中心、自鄂东向鄂西递减的主要空间分布型;15:00臭氧与温度呈现较好的正相关关系,以随州、襄阳及其周边最为明显;与14:00相对湿度呈现很好的负相关关系,以孝感、随州、荆门及其周边最为明显;襄阳西部和十堰北部地区15:00 50 m风场的纬向分量对本地臭氧高值有一定影响,武汉北部、黄冈北部以及孝感东部等地15:00 50 m风场的经向分量对本地臭氧高值影响较大。

EOF/SVD Based Characteristics of Ozone in Hubei Province in 2018 and the Relationship Between Its High Values and Meteorological Factors

Based on the ground observation dataset of the hourly O₃,temperature and relative humidity,and the reanalysis data of hourly wind at 50 m in Hubei Province from April to October in 2018,the characteristics of ozone over Hubei Province and the relationship between its high values and meteorological factors are analyzed with EOF/SVD methods. The results show that the anomaly of maximum 8 h average concentration of ozone over Hubei Province shows the main spatial distribution pattern with Wuhan as the positive center and decreasing from eastern Hubei to western Hubei. Ozone at 3 pm shows a good positive correlation with the temperature at 3 pm,most obvious in Suizhou,Xiangyang and its surroundings,and shows a good negative correlation with the relative humidity at 2 pm,most obvious in Xiaogan,Suizhou,Jingmen and its surroundings. The latitudinal component of the 50 m wind at 3 pm in the western Xiangyang and the northern Shiyan has certain influence on the high value of local ozone. The meridional component of the 50 m wind at 3 pm in northern Wuhan,northern Huanggang and eastern Xiaogan has a great influence on the high value of local ozone.