气候变化领域集成服务门户(CCPortal): Rapid reappearance of air pollution after cold air outbreaks in northern and eastern China

CCPortal

DOI	10.5194/acp-22-13371-2022
	Rapid reappearance of air pollution after cold air outbreaks in northern and eastern China
	Liu, Qian; Chen, Guixing; Sheng, Lifang; Iwasaki, Toshiki
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	13371
结束页码	13388
卷号	22 期号:20 页码:18
英文摘要	The cold air outbreak (CAO) is the most important way to reduce air pollution during the winter over northern and eastern China. However, a rapid reappearance of air pollution is usually observed during its decay phase. Is there any relationship between the reappearance of air pollution and the properties of CAO? To address this issue, we investigated the possible connection between air pollution reappearance and CAO by quantifying the properties of the residual cold air mass after CAO. Based on the analyses of recent winters (2014-2022), we found that the rapid reappearance of air pollution in the CAO decay phase has an occurrence frequency of 63 %, and the air quality in more than 50 % of CAOs worsens compared to that before CAO. The reappearance of air pollution tends to occur in the residual cold air mass with a weak horizontal flux during the first 2 d after CAO. By categorizing the CAOs into groups of rapid and slow air pollution reappearance, we found that the residual cold air mass with a moderate depth of 150-180 hPa, a large negative heat content, and small slopes of isentropes is favorable for the rapid reappearance of air pollution. Among these factors, the cold air mass depth is highly consistent with the mixing layer height, below which most air pollutants are found; the negative heat content and slope of isentropes in the cold air mass jointly determine the intensity of low-level vertical stability. The rapid reappearance of air pollution is also attributed to the maintenance of the residual cold air mass and the above conditions, which are mainly regulated by the dynamic transport process rather than diabatic cooling or heating. Furthermore, analysis of the large-scale circulation of CAOs in their initial stage shows that the anticyclonic (cyclonic) pattern in northern Siberia (northeastern Asia) can be recognized as a precursor for the rapid (slow) reappearance of air pollution after the CAO.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000869380400001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272986
作者单位	Sun Yat Sen University; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai); Ocean University of China; Tohoku University
推荐引用方式 GB/T 7714	Liu, Qian,Chen, Guixing,Sheng, Lifang,et al. Rapid reappearance of air pollution after cold air outbreaks in northern and eastern China[J],2022,22(20):18.
APA	Liu, Qian,Chen, Guixing,Sheng, Lifang,&Iwasaki, Toshiki.(2022).Rapid reappearance of air pollution after cold air outbreaks in northern and eastern China.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(20),18.
MLA	Liu, Qian,et al."Rapid reappearance of air pollution after cold air outbreaks in northern and eastern China".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.20(2022):18.