城市大气臭氧柱浓度时空变化研究——以天水为例

城市臭氧发生发展规律的研究将为城市环境管理提供理论依据。文章利用卫星OMITO3e数据产品,解译和分析了天水市2006~2014年臭氧柱浓度的时空动态信息。结果表明:(1)空间分布呈现东北、西北高,中部、南部低的倒"V"字形;(2)年变化呈单峰曲线,从2006年至2010年为上升期,每年的增长率为3.98%,2010年至2014年为下降期,年均下降率为2.52%;(3)四季变化明显分为两个阶段,前三年为冬季春季夏季秋季;后六年以夏、春季变化为主,冬、秋季为辅,夏季春季冬季秋季。夏、春两季在第二阶段明显升高与当地经济的快速发展有密切的关系;(4)9年间臭氧柱浓度平均值为301.177 DU,最大值为325.829 DU,最小值为279.093 DU,臭氧柱浓度指示的多年空气质量等级为良好。

Temporal and Spatial Variation of Ozone Concentration in Urban Atmosphere: A Case Study of the City of Tianshui

Study on the law of development of urban ozone can provide theoretical basis for urban environmental management. In this paper, temporal and spatial information of the concentration of ozone in Tianshui City during 2006-2014 were analyzed by using satellite OMITO3e data products. Results show that:(1) the spatial distribution shows "V" shape with high contents in northeast and northwest and low contents in the middle and south; (2) the air quality grade of the study area is good for many years;(3) annual change shows a single peak curve, for 9 years the average concentration of ozone column value is 301.177 DU; the maximum value is 325.829 DU; the minimum value is 279.093 DU. From 2006 to 2010, the trend is rising with annual growth rate of 3.98%. From 2010 to 2014 is the period of decline, with an average annual decline rate of 2.52%; (4) nine study years could divided into two stages, in the first three years, ozone distribution is in the order of winter > summer > autumn > spring, and summer > autumn > winter > spring in the last six years. The two stages of ozone column concentration is closely related to the rapid development of local economy.