| 南京市O3污染时空演变特征及气象因素影响分析 |
| Analysis of Ozone Temporal and Spatial Variation Characteristics and Meteorological Factors in Nanjing |
| 投稿时间：2023-03-16 修订日期：2024-05-10 |
| DOI：10.19316/j.issn.1002-6002.2024.05.03 |
| 中文关键词: O3 时空演变 日变化分型 气象因素 |
| 英文关键词:O3 temporal and spatial evolution classification of diurnal variation meteorological factors |
| 基金项目:国家自然科学基金资助项目(41805120);江苏省环境监测科研基金资助项目(2112);南京环保科技项目(202111);江苏省南京环境监测中心内设课题(202303) |
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| 通讯作者:丁峰* 江苏省南京环境监测中心, 江苏 南京 210013 |
| 摘要点击次数: 283 |
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| 中文摘要: |
| 利用南京市2016—2022年空气自动监测网数据,详细分析了南京市O3时空分布特征及气象因素影响。结果表明:2016—2022年O3日最大8 h滑动平均质量浓度(O3-8 h)超标天数占总超标天数比例呈明显上升趋势,上升了32.3个百分点;O3污染月份有所增加,由4—9月延长至3—11月。O3-1 h日变化总体呈单峰型,峰值出现时间由15:00延后至16:00,O3污染持续时间有所延长,2019—2022年各时段平均O3小时质量浓度比2016—2018年高1~10 μg/m3,污染总体抬升。2016—2022年O3-8 h北部郊区点位年均增长率约为8.7 μg/m3,南部郊区点位约为5.6 μg/m3,均高于全市的0.5 μg/m3;O3超标时间北部郊区点位年均增长率约为7 d,南部郊区点位约为5 d,均高于全市的2 d。当气温超过27 ℃时O3超标率增长迅速,气温区间为(30,35］℃时O3超标率最高(超过50%)。当气温小于33 ℃、相对湿度小于40%时,O3平均浓度和超标率随气温和相对湿度的升高而升高;气温大于35 ℃、相对湿度大于60%时,O3平均浓度和超标率随气温和相对湿度的升高而降低。风速区间为(4,5］m/s、风向为SE和S时,O3超标率和平均浓度最高。 |
| 英文摘要: |
| Based on the data of Nanjing automatic air monitoring network from 2016 to 2022,the spatial and temporal distribution characteristics and the influence of meteorological factors on O3 in Nanjing were analyzed in detail.The results showed that the proportion of days with O3-8 h exceeding the standard from 2016 to 2022 had significantly increased by 32.3 percentage points.The months with O3 pollution had increased from April to September to March to November.The daily variation of O3 concentration showed a unimodal pattern,with the peak postponing from 15:00 to 16:00.The duration of O3 pollution had increased,and the average hourly concentration of O3 in each time period from 2019 to 2022 was higher than that from 2016 to 2018,ranging from 1 to 10 μg/m3,indicating an overall increase in O3 pollution.The average annual increase of O3-8 h in the northern suburban areas from 2016 to 2022 was about 8.7 μg/m3 and that in the southern suburban areas was about 5.6 μg/m3,both higher than the city's average annual increase of 0.5 μg/m3.The average annual increase of the number of days with O3 exceeding the standard in the northern suburban areas was about 7 days,and that in the southern suburban areas was about 5 days,both higher than the city's average annual increase of 2 days.When the temperature exceeded 27 ℃,the O3 exceeding standard rate increased rapidly.The O3 exceeding standard rate was the highest with the temperature range of (30,35］ ℃,exceeding 50%.When the temperature was less than 33 ℃ and the relative humidity was less than 40%,the average concentration of O3 and the rate of exceeding the standard would increase with the increase of the air temperature and relative humidity.When the temperature was more than 35 ℃ and the relative humidity was more than 60%,the average concentration of O3 would decrease with the increase of the air temperature and relative humidity.When the wind speed was in the range of (4,5］m/s,and the wind direction was SE and S,the O3 excess rate and average concentration were the highest. |
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