| 摘要: |
| 利用郴州市区2017-2020年臭氧（O3）观测资料及地面气象资料，分析O3浓度时空分布特征及其与气象因子的关系，结果表明：郴州市区O3质量等级以优为主，占全年的62 %~73 %，相比2017-2019年，2020年受新冠疫情影响污染物排放有所降低，但O3作为首要污染物总天数明显上升，占全年51%；郴州市区2017-2020年O3-8h月均值浓度范围为32~175 μg/m3，月变化大致呈双峰型，出现在5月和10月，O3-8h浓度和NO2浓度月变化呈负相关关系。O3-1h日变化呈单峰型，白天浓度明显高于夜间，与NO2小时数据成显著负相关关系。O3浓度与温度、日照时数成正相关，与气压、湿度、降水成负相关，与日照时数相关性最好；风向的影响主要分布在偏南和偏北方向上；当郴州市区O3浓度出现超标时，气温的范围为22.7~34.5 ℃，本站气压变化范围为960.9~973.7 hPa，相对湿度变化范围为26 %~72 %，风速变化范围为1.7~10.2 m/s。以2020年4月27-30日郴州市区一次臭氧轻度污染过程为例，结合气象资料分析，结果表明：该次污染过程发生在高层为平直西风环流，低层处高压底部控制的天气形势下。温度偏高，湿度较低，日照时间长，近地面有风向辐合。此次O3污染过程主要受本地生成及南方外源输送的共同影响。 |
| 关键词: 臭氧浓度；时空分布；气象因子；污染过程；郴州； |
| DOI： |
| 投稿时间：2023-02-03修订日期：2023-05-08 |
| 基金项目: |
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| Analysis of Atmospheric Ozone Pollution Characteristics and Meteorological Conditions in Chenzhou China |
| zhouqiying,yuantao,liuhui |
| (Yongxing County Meteorological Bureau of Hunan Province;Chenzhou Meteorological Bureau) |
| Abstract: |
| The spatial and temporal distribution characteristics of O3 concentration are explored by using the observation and meteorological data of ozone (O3) in Chenzhou City during 2017-2020. The relationships between O3 and meteorological factors are further analyzed. The results shows that the quality of O3 in Chenzhou city is mainly excellent, accounting for 62 %-73 % of the whole year. In 2020, the concentration of pollutants is significantly reduced by COVID-19, and the mean value of O3-8h during 2017-2020 is 32-175 μg/m3, the monthly variation shows roughly bimodal distribution, peak value occurs in May and October. There is a negative correlation between the monthly variation of O3-8h concentration and NO2 concentration. The daily variation of O3-1h shows a single peak, the concentration in daytime is significantly higher than that of at night, and O3-1h shows significant negative correlation with NO2 hourly data. O3 concentration is positively correlated with temperature, negatively correlated with air pressure, humidity and precipitation, and show highest correlation with humidity; The influence of wind direction is mainly distributed in the south and north directions; When the O3 concentration in Chenzhou urban area exceeds the standard value, the temperature range is 22.7-34.5 ℃, the pressure variation range of the station is 960.9-973.7 hPa, the relative humidity variation range is 26 %-72 %, and the wind speed variation range is 1.7-10.2 m/s. Taking a slight ozone pollution process in Chenzhou urban area from April 27 to 30, 2020 as an example, combined with the analysis of meteorological data, the results show that the pollution process occurs under the weather condition of a flat westerly circulation in the upper layer and high pressure control at the bottom of the lower layer. The temperature is high, the humidity is low, the sunshine time is long, and there is wind convergence near the ground. This O3 pollution process is mainly affected by local generation and external transportation in the south direction. |
| Key words: ozone concentration; temporal and spatial distribution; meteorological factors; convergence of pollution processes；Chenzhou; |
