| 摘要: |
| 本文通过观测陕西师范大学长安校区52 m高度范围内的臭氧浓度和相关气象条件，研究了西安市长安区O3浓度的昼夜变化和垂直变化规律，探究O3浓度与NOx浓度、与气象条件之间相关性，为客观地掌握西安市长安区O3污染特征提供参考和依据。观测结果表明：（1）西安市长安区52 m高度范围内夏季的臭氧浓度比冬季高，大约是冬季浓度2倍。冬季和夏季的臭氧浓度昼夜变化趋向大致相同，将变化特点分为3个阶段，分别是04:00 — 08:00、10:00 — 20:00和22:00 —次日02:00，呈现一高一低的阶段变化。（2）西安市长安区夏季与冬季臭氧浓度垂直变化规律各有2种类型。夏季第1种类型出现在08:00 — 18:00，其变化特点是臭氧浓度在1 — 16 m、19 — 28 m、31 — 52 m高度分别随着高度增加而呈现递增、递减再递增的变化规律。冬季08:00 — 18:00出现第1种类型，在1 — 16 m、19 — 37 m、40 — 52 m高度臭氧浓度也随着高度增加而呈现递增、递减再递增的变化规律。夏季与冬季20:00 — 次日06:00均出现第2种类型，臭氧浓度在1 — 16 m、19 — 52 m高度随高度增加而呈现先递增后递减的变化规律。（3）西安市长安区夏季与冬季臭氧浓度与风速、相对湿度以及氮氧化物浓度呈负相关，与温度呈正相关，与气压的相关性较低。 |
| 关键词: 臭氧浓度 昼夜变化 垂直变化 季节变化 西安市长安区 |
| DOI：10.7515/JEE201706008 |
| 分类号: |
| 基金项目:中国科学院国际合作局对外合作重点项目（GJHZ1543） |
| 英文基金项目:Key Program for External Cooperation of Bureau of International Cooperation, Chinese Academy of Sciences (GJHZ1543) |
|
| Temporal and vertical variation of ozone in the Chang’an campus of Shaanxi Normal University |
|
CHEN Jiayuan1, ZHAO Jingbo1,2
|
|
1. College of Geography and Tourism, Shaanxi Normal University, Xi’an 710119, China
2. Key Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
|
| Abstract: |
| Background, aim, and scope In many cities, the ozone concentrations exceeds the standard, and even in some cities, the ozone has gradually become the main pollutants in air pollution. The aim of this study was to study the diurnal variation and vertical variation of ozone concentrations in Xi’an, Chang’an District, and to explore the correlation between the concentrations of ozone and nitrogen oxides, and meteorological conditions. Materials and methods We observed the ozone concentrations and related meteorological conditions in the 52 m height range of the Chang’an campus of Shaanxi Normal University. The Professional Gas Detector was used to measure the concentrations of O3x3Results (1) The diurnal variation trend of ozone concentrations in summer and winter was approximately the same, and the change trend was divided into three stages: 04:00 — 08:00, 10:00 — 20:00 and 22:00 — 02:00, showing high and low stage changes. (2) The Chang’an District of Xi’an city in summer and winter ozone concentrations has two types of change regulation on vertical direction. It is characterized by ozone concentrations in the range of 1 — 16 m, 19 — 28 m,31 — 52 m, respectively, with the increase of height, decline and then increase. The first type of winter also appeared in the 08:00 — 18:00, 1 — 16 m, 19 — 37 m, 40 — 52 m range of ozone concentrations also increased with height, decreased and then increased. The second changes in summer and winter appeared in 20:00 — 06:00, the ozone concentrations in 1 — 16 m increase with height, and then decreased in the range of 19 — 52 m with height. Discussion The change of ozone concentration reflects the intensity of ultraviolet radiation on the one hand, and on the other hand shows the change of diffusion conditions. Conclusions The concentration of O3 in summer exceeded the second national level standards, and the concentration of O3 in winter did not exceed the second national level standards. Recommendations and perspectives It should be considered the diffusion conditions when we want to deal with the ozone pollution. |
| Key words: ozone concentrations diurnal variation vertical change seasonal variation Chang’an District of Xi’an city |
