2014-2020年河南省PM2.5-O3复合污染特征及气象成因分析
Analysis on characteristics of PM2.5-O3 compound pollution and meteorological causes in Henan Province from 2014 to 2020
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摘要: 为揭示河南省PM2.5-O3复合污染特征及气象成因，基于2014-2020年河南省18个地市的国控大气环境监测站数据，对河南省PM2.5-O3的复合污染特征、污染物浓度分布以及关键气象因子进行分析。结果表明：①PM2.5-O3复合污染日在空间分布上呈现河南省中北部向周围逐渐减少的特点，而单O3和单PM2.5污染主要集中于豫北地区。从年尺度分析，2014~2020年PM2.5-O3复合污染有波折，2014~2015年PM2.5-O3复合污染上升，2016年不存在PM2.5-O3复合污染，2017~2020年呈现下降趋势；从月际变化看，PM2.5-O3复合污染天数主要集中在4-7月份以及10月份；从季节角度分析，夏季污染程度最低，春季和冬季复合污染频发；在日变化方面，单O3污染和PM2.5-O3复合污染浓度变化趋势一致， 呈“单峰”分布，下午15:00达到最大值。②PM2.5-O3复合污染下气温平均值为24℃，相对湿度平均值为58%，日风向主要以偏北风为主，在所有风向中占比达51.75%，全年整体风速平均值为 2.65m/s，春季平均风速最大（3.09 m/s），夏季平均风速最小（2.40 m/s）。当气温为13.67~23.44℃，相对湿度区间为40%~65%，风向为北风-东北风以及风速为有利于PM2.5-O3复合污染的发生。Abstract: Abstract: In order to reveal the characteristics and meteorological causes of PM2.5-O3 compound pollution in Henan Province, based on the data of state-controlled atmospheric environment monitoring stations in 18 prefectures and cities in Henan Province from 2014 to 2020, the characteristics, pollutant concentration distribution and key meteorological factors of PM2.5-O3 compound pollution in Henan Province were analyzed. The results show that: (1) the spatial distribution of PM2.5-O3 compound pollution day shows the characteristics of gradually decreasing from the central and northern part of Henan Province to the surrounding area, while the single O3 and single PM2.5 pollution are mainly concentrated in the northern part of Henan Province. From the annual scale analysis, the PM2.5-O3 composite pollution has twists and turns from 2014 to 2020, the PM2.5-O3 composite pollution increased from 2014 to 2015, there was no PM2.5-O3 composite pollution in 2016, and it showed a downward trend from 2017 to 2020; From the monthly variation, the PM2.5-O3 compound pollution days are mainly concentrated in April July and October; From the perspective of season, the pollution degree is the lowest in summer, and the compound pollution occurs frequently in spring and winter; In terms of daily variation, the variation trend of single O3 pollution and PM2.5-O3 compound pollution concentration is consistent, showing a "single peak" distribution, reaching the maximum at 15:00 PM. ② Under the combined pollution of PM2.5-O3, the average temperature is 24 ℃ , the average relative humidity is 58%, and the daily wind direction is mainly northerly, accounting for 51.75% of all wind directions. The average annual wind speed is 2.65m/s, the maximum average wind speed in spring (3.09 M / s) and the minimum average wind speed in summer (2.40 M / s). When the temperature is 13.67 ~ 23.44 ℃ , the relative humidity range is 40% ~ 65%, the wind direction is north wind northeast wind and the wind speed is favorable for the occurrence of PM2.5-O3 compound pollution.
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Key words:
- PM2.5-O3 /
- space-time variation /
- meteorological factors /
- Henan Province
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