2015—2019年蘇州臭氧時(shí)空特征及氣象影響因子研究

doi:10.12306/2022jms.0100

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2015—2019年蘇州臭氧時(shí)空特征及氣象影響因子研究
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                        10.12306/2022jms.0100
                    
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中圖分類號:X511
基金項(xiàng)目:北極閣基金面上項(xiàng)目(BJG202308);江蘇省氣象局面上基金項(xiàng)目(KM202311);江蘇省氣象局青年基金項(xiàng)目(KQ202125);蘇州市氣象局自立課題(SZKJ201701)

Analysis of temporal and spatial characteristics and impact meteorological factors of ozone in Suzhou during 2015 to 2019

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基于2015—2019年蘇州17個(gè)環(huán)境監(jiān)測站的臭氧(O₃)監(jiān)測資料和7個(gè)國家氣象站的氣象資料,開展了蘇州O₃時(shí)空特征及氣象影響因子的研究。結(jié)果表明:(1)2015—2019年O₃超標(biāo)率先升后降,空間呈南(20.9%)高北(18.7%)低;O₃污染天氣型中低壓型占比最高(34.3%),均壓型下(占比18.6%) O₃平均濃度最高,達(dá)190.0 μg·m^-3。(2)2016—2017年O₃濃度全市平均增長15.6%,2017—2018年平均下降10.0%,2018—2019年北部O₃濃度平均下降4.1%,東部下降3.0%,市區(qū)以南平均增長6.9%;O₃濃度呈"雙峰"月分布(5月和8月是峰值)和"單峰型"日變化,早晨07時(shí)(北京時(shí),下同)為谷值,最低為34.4 μg·m^-3(2018年),下午15—16時(shí)達(dá)峰值,最高為119.3 μg·m^-3(2017年)。(3)2017年和2019年全市的"周末效應(yīng)"明顯,由于其周末的氣象條件更利于O₃濃度升高,2016年北部沿江的"周末效應(yīng)"主要與工業(yè)分布和人為活動有關(guān)。(4)多種氣象條件與O₃濃度呈顯著相關(guān)性,當(dāng)最高氣溫超過28℃、日照8 h以上、相對濕度62%以下、日降水量10 mm以下,易發(fā)生O₃二級超標(biāo)污染;區(qū)域O₃濃度的變化主要受不同風(fēng)向的傳輸影響。

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The temporal and spatial characteristics of ozone and meteorological impact factors in Suzhou were analyzed in this paper based on the ozone data of 17 air quality monitoring stations and meteorological data of 7 national meteorological observation stations from 2015 to 2019. Results showed that O₃ exceeding rate of pollution first increased and then decreased during 2015 to 2019, with the spatial distribution of O₃ exceeding rate was higher in the south (20.9%) than in the north (18.7%). The O₃ pollution synoptic type of low pressure accounted for the highest proportion with 34.3%, while the average O₃ concentration was the highest by reaching 190.0 μg·m^-3 under the synoptic type of homogeneous pressure accounted for the proportion with 18.6%. O₃ concentration increased by 15.6% on average in the whole city from 2015 to 2017, and decreased by 10.0% from 2017 to 2018, then from 2018 to 2019, O₃ concentration decreased in the north and east, with the decline rates were 4.1% and 3.1%, respectively, while in the south of the urban area increased by 6.9%. The O₃ concentration presents a bimodal monthly variation with the peaks in May and August.The diurnal variations of O₃ were unimodal. The lowest valley value was 34.4 μg·m^-3 appeared at 7 am in 2018, and the peak value was 119.3 μg·m^-3 appeared between 3 and 4 pm in 2017. The "weekend effect" was obvious during 2017 and 2019 across the city, because the meteorological conditions on weekends were more conducive to the increase of O₃ concentration.While the "weekend effect" during 2016 in the northern part of the city along Yangtze River, which was mainly related to industrial distribution and human activities. There is a significant correlation between multiple meteorological conditions and O₃ concentration. O₃ pollution frequently occurred with temperature exceeding 28℃, duration of sunshine more than 8 hours, the relative humidity below 62%, and the daily precipitation less than 10 millimetres. The variation of regional O₃ concentration is mainly affected by the transmission of different wind directions.

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何琰,曹舒婭,陳慧敏,陸家豪,楊倩.2015—2019年蘇州臭氧時(shí)空特征及氣象影響因子研究.氣象科學(xué),2025,45(2):216-228 HE Yan, CAO Shuya, CHEN Huimin, LU Jiahao, YANG Qian. Analysis of temporal and spatial characteristics and impact meteorological factors of ozone in Suzhou during 2015 to 2019. Journal of the Meteorological Sciences,2025,45(2):216-228

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收稿日期:2022-09-06
最后修改日期:2022-12-19
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在線發(fā)布日期: 2025-07-03
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