Trends of surface ozone based on hourly concentrations in the Beijing–Tianjin–Hebei region during 2017–2021

IF 2.3 4区地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric and Oceanic Science Letters Pub Date : 2024-11-01 DOI:10.1016/j.aosl.2024.100514

Xiaoyan Wang, Huihui Zheng, Bing Liu, Shuyan Xie, Yonghai Huang, Shuai Wang

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Abstract

As a typical secondary air pollutant, surface ozone has been monitored routinely since 2013 in China. Most studies on the spatiotemporal variation of ozone have been centered around the daily maximum 8-h average, with little attention paid to the trends of hourly ozone, especially hourly ozone exceedances. Focusing on hourly ozone exceedances and peak values, the spatiotemporal trends of hourly ozone at 77 sites in 13 cities of the Beijing–Tianjin–Hebei (BTH) region during 2017–2021 were analyzed in this study. The number of hours with exceedances (N_H200) in 2019 was nearly three times that of 2021. On a five-year average, the percentage of cumulative N_H200 in June accounted for up to 40.5 % of all hourly exceedances. Cities in central Hebei Province had the highest cumulative annual N_H200. June had the highest average hourly ozone exceeded multiples of 0.158. The top two cities with the highest average exceeded multiple were Tangshan (0.166) and Beijing (0.158). Tangshan and Xingtai ranked as the top two in terms of the mean of the 10 highest daily maximum ozone concentrations (MTDM), with 286.74 and 285.37 µg m⁻³, respectively. The gap between the MTDM and the daily maximum of hourly ozone averaged over all sites had narrowed to 97.88 µg m⁻³ in 2021, much lower than that in other years, which indicated that the stability and convergence of ozone pollution in BTH region had been enhanced in 2021 to some extent.

摘要

本文以京津冀地区为研究对象, 采用国际常用的评价指标, 在分析2017–2021年臭氧小时浓度变化趋势的基础上, 重点讨论了小时浓度超标情况及其峰值水平. 结果显示, 2019年臭氧小时浓度超标数约为2021年的3倍, 6月份小时浓度超标数占比高达40.5%, 河北中部城市小时浓度超标情况突出; 2017年和2019年臭氧小时浓度超标倍数在高位区间的占比相对最高, 唐山和邢台的小时浓度峰值水平相对较高. 本文可为后续进一步研究局地臭氧污染特征和异常污染事件提供基础参考.

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2017-2021 年京津冀地区基于小时浓度的地表臭氧变化趋势

作为典型的二次空气污染物，地表臭氧自 2013 年起在中国开始常规监测。对臭氧时空变化的研究大多围绕臭氧日最大值的 8 小时平均值展开，很少关注臭氧小时值的变化趋势，尤其是臭氧小时超标情况。本研究以臭氧小时超标和峰值为重点，分析了 2017-2021 年京津冀地区 13 个城市 77 个站点的臭氧小时时空变化趋势。2019年的超标小时数（NH200）是2021年的近3倍。从五年平均值来看，6 月份累计 NH200 小时数占所有超标小时数的比例高达 40.5%。河北省中部城市的 NH200 年累计值最高。6 月份臭氧平均小时超标倍数最高，为 0.158。平均超标倍数最高的前两个城市是唐山（0.166）和北京（0.158）。唐山和邢台分别以 286.74 微克/立方米和 285.37 微克/立方米的 10 个最高日臭氧浓度（MTDM）平均值位居前两位。2021 年，所有站点臭氧日最大小时浓度平均值与臭氧日最大小时浓度平均值的差距缩小至 97.88 µg m-3，远低于其他年份，这表明 2021 年京津冀地区臭氧污染的稳定性和趋同性得到了一定程度的增强。摘要本文以京津冀地区为研究对象，采用国际常用的评价指标，在分析 2017-2021 年臭氧小时浓度变化趋势的基础上，重点讨论了小时浓度超标情况及其峰值水平。结果显示，2019年臭氧小时浓度超标数约为2021年的3倍，6月份臭氧小时浓度超标数占比高达40.5%，河北中部城市臭氧小时浓度超标情况突出；2017年和2019年臭氧小时浓度超标倍数在高位区间的占比相对最高，唐山和邢台的臭氧小时浓度峰值水平相对较高。本文可为后续进一步研究局地臭氧污染特征和异常污染事件提供基础参考。

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