摘要:
利用2017年1~12月间连续监测数据,分析了遵义市城郊O3浓度变化特征。结果表明,遵义市郊区O3浓度高于城区,O3日均浓度主要集中于40~120μg·m-3之间。城郊O3浓度季节性特征表现为夏季>秋季>春季>冬季;城郊O3浓度日变化均呈单峰型,且表现出显著的"周末效应",其中夏、秋季郊区峰值明显高于城区,冬、春季夜间城区O3浓度显著高于郊区。冬季城区日变化峰值出现早于郊区,具有明显的O3输送特征。相关性研究表明,O3浓度与相对湿度及气压呈显著负相关性,而与风速和气温呈显著正相关性;相对湿度对O3浓度影响相对较大,而风速对城区背景评价点O3浓度影响相对较小。
Abstract:
Based on the continuous monitoring data from January to December in 2017, the variation characteristics of ozone concentration in urban and suburban areas of Zunyi City were analyzed. The results showed that the concentration of ozone in the suburbs was higher than that the urban areas, and the daily average concentration of ozone mainly appeared in 40~120μg·m-3. The ozone concentration in suburbs had obvious seasonal variation characteristics, which was as following order:summer > autumn > spring > winter. And the daily variation of ozone concentration showed unimodal type distribution and obviously "weekend effect", which meant that the ozone concentrations in daytime of weekend was higher than that in weekday. The peak value of ozone in suburbs in summer and autumn was significantly higher than that in urban areas, while the concentration of ozone in urban in winter and spring at night was significantly higher than that in suburbs. In addition, the occurrence of the peaks of ozone concentration in the city was earlier than that in the suburbs in winter, which exhibited significant ozone transmission characteristic. The relevant studies showed that ozone concentration had a significant negative correlation with relative humidity and pressure and had a positive correlation with wind speed and temperature. Additionally, the relative humidity had high effect on the concentration of ozone and the effect of wind speed on the urban background evaluation point was relatively small.
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