Independent and compound characteristics of PM2.5, ozone, and extreme heat pollution events in Korea

IF 2.9 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Yumeng Qiu, Libang Ma, Tianzhen Ju
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引用次数: 0

Abstract

In the context of global warming and rapid urbanization, the frequency of simultaneous occurrence of extreme high temperature, ozone pollution, and particulate matter pollution has increased. However, independent and composite characterization of PM2.5, ozone, and extreme heat pollution events has not been systematically analyzed so far. This study combines meteorological and pollutant data with the GTWR model in an attempt to reveal the patterns of independent heat days (IHD), compound PM2.5-ozone pollution (CPOP), and composite heat-PM2.5-ozone pollution (CHPOP). In this study, we found that in July and August in South Korea, the frequency of CPOP events, the frequency of CHPOP events, and the composite proportion of CHPOP events all show an overall pattern of east-high and west-low; the atmospheric circulation patterns of the three extreme events have brought about more stagnation conditions, which may be related to cyclone activity; the occurrence of CPOP events is mainly accompanied by a continuous decrease in relative humidity and cloud cover, both IHD and CHPOP events occur with increasing temperatures, decreasing cloudiness, and anomalously high pressures; under the same events, excluding relative humidity, PM2.5 and ozone showed similar conditions with respect to the dependence on temperature, wind speed, barometric pressure, cloudiness, and nitrogen dioxide. This study identified the independent and composite characteristics of PM2.5, ozone, and extreme heat pollution events, which can enhance early prediction and pollution prevention of these extreme events.

韩国PM2.5、臭氧和极端热污染事件的独立和复合特征
在全球变暖和快速城市化的背景下,极端高温、臭氧污染和颗粒物污染同时发生的频率有所增加。然而,PM2.5、臭氧和极端热污染事件的独立和复合表征迄今尚未得到系统分析。本研究将气象和污染物数据与GTWR模型相结合,试图揭示独立热日数(IHD)、复合pm2.5 -臭氧污染(CPOP)和复合热- pm2.5 -臭氧污染(CHPOP)的模式。本研究发现,韩国7月和8月的CPOP事件频次、CHPOP事件频次、CHPOP事件复合比例均呈现东高西低的总体格局;三次极端事件的大气环流型带来了更多的停滞条件,这可能与气旋活动有关;CPOP事件的发生主要伴随着相对湿度和云量的持续减少,IHD和CHPOP事件的发生都伴随着温度升高、云量减少和异常高压;在相同事件条件下,除相对湿度外,PM2.5和臭氧对温度、风速、气压、云量和二氧化氮的依赖情况相似。本研究确定了PM2.5、臭氧和极端热污染事件的独立和复合特征,可以增强这些极端事件的早期预测和污染预防。
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来源期刊
Environmental Monitoring and Assessment
Environmental Monitoring and Assessment 环境科学-环境科学
CiteScore
4.70
自引率
6.70%
发文量
1000
审稿时长
7.3 months
期刊介绍: Environmental Monitoring and Assessment emphasizes technical developments and data arising from environmental monitoring and assessment, the use of scientific principles in the design of monitoring systems at the local, regional and global scales, and the use of monitoring data in assessing the consequences of natural resource management actions and pollution risks to man and the environment.
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