| 中国高温下臭氧抑制事件的时空特征及其影响因素 |
| 摘要点击 1427 全文点击 391 投稿时间：2022-11-17 修订日期：2023-02-01 |
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| 中文关键词 臭氧抑制事件 高温 时空特征 影响因素 中国 Z检验 |
| 英文关键词 ozone suppression events high temperatures space-time characteristics influencing factors China Z test |
| 作者 | 单位 | E-mail | | 欧林冲 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 511443 | oulc1998@stu2020.jnu.edu.cn | | 陈伟华 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 511443 | chenwh26@163.com | | 伍永康 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 511443 | | | 吴乐敏 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 511443 | | | 王雪梅 | 暨南大学环境与气候研究院, 粤港澳环境质量协同创新联合实验室, 广州 511443 | |
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| 中文摘要 |
| 温度是影响臭氧生成的关键气象因子，通常情况下，臭氧和温度呈显著正相关关系，即臭氧浓度随着温度的升高而上升.然而这种关系在极高温时可能发生改变，当温度超过某个阈值时，臭氧浓度呈下降趋势，称为臭氧抑制事件.臭氧抑制事件导致气候变化背景下未来空气质量预测具有更多不确定性.基于全国空气质量监测数据和气象观测数据，采用Z检验方法，系统分析了2013~2020年暖季（4~9月）我国臭氧抑制事件频次及临界温度（Tx）的时空特征，并分析了引起臭氧抑制事件发生的可能影响因素.结果表明，2013~2020年暖季，我国约有18%的站点发生臭氧抑制事件，发生频率较高的站点主要分布在四川、新疆、陕西等中国中西部地区，平均达到10次·a-1.发生臭氧抑制事件的Tx介于19.2~39.3℃，且大多数站点的Tx呈逐年上升趋势；Tx高值区主要分布在四川、重庆、湖南和湖北等中西部地区，而Tx低值区则集中在青藏高原一带.与Tx年变化趋势相反，2013~2020年暖季京津冀的臭氧抑制事件频率显著下降，汾渭平原、长三角和成渝地区的臭氧抑制事件频率呈"升高-降低-升高"变化特征.珠三角城市群极端高温抑制臭氧的作用最显著.此外，臭氧前体物（例如NO2）和气象条件（风速、风向）是导致臭氧抑制事件的可能原因. |
| 英文摘要 |
| Temperature is a key meteorological factor affecting ozone formation. In general, a positive correlation is observed between ozone and temperature, that is, ozone concentration increases with the increase in temperature. However, this relationship may change at extremely high temperatures. When the temperature exceeds a threshold value, the ozone concentration tends to decrease, which is referred to as an ozone suppression event. Ozone suppression events lead to greater uncertainties in the prediction of future air quality under climate change. Based on the national air quality monitoring data, reanalysis data, and meteorological observation data, this study used the Z test to systematically analyze the spatio-temporal characteristics of the critical temperature(Tx) and frequency of ozone suppression events in China during the warm season(April to September) from 2013 to 2020 and further analyzed the possible influencing factors for the occurrence of ozone suppression events. The results showed that approximately 18% of the sites in China experienced ozone suppression events in the warm season from 2013 to 2020. The sites with a high frequency of ozone suppression events were mainly distributed in the central and western regions of China, such as Sichuan, Xinjiang, and Shaanxi, with an average frequency of ten times per year. The critical temperature(Tx) ranged from 19.2 to 39.3℃, and the Tx of most sites showed an increasing trend from 2013 to 2020. The high values of Tx were mainly distributed in the central and western regions such as Sichuan, Chongqing, Hunan, and Hubei, whereas the low values of Tx were concentrated in the Qinghai-Tibet Plateau. Contrary to the interannual trend of Tx, the frequency of ozone suppression events decreased significantly in the Beijing-Tianjin-Hebei Region and exhibited a characteristic of "increase-decrease-increase" in the Fenwei Plain, the Yangtze River Delta, and the Chengdu-Chongqing regions. The most significant effect of extreme high temperature on ozone suppresion was found in the Pearl River Delta Region. In addition, ozone precursors(e.g., NO2) and meteorological conditions(wind speed and direction) were possible factors affecting the occurrence of ozone suppression events. |
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