嘉兴夏季臭氧污染的近地层垂直变化特征

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Abstract Based on O₃ surface data in 2018 from 14 monitor stations and meteorological factors of Jiaxing city, Zhejiang Province, this study analyzed the relationship between O₃ and meteorological factors. The vertical profile of O₃ was characterized by a differential absorption O₃ lidar. Temperature and relative humidity were the dominating factors for high concentration O₃ pollution, with the range of 24~36℃ and 36%~77%, respectively. The temperature above 24℃ and the relative humidity below 77% can be used as the meteorological threshold for early warning of O₃ pollution. The O₃ lidar results showed that the vertical O₃profiles were similar between episodic and clean days, which exhibited an O₃ peak between 600~800m, while the O₃ concentrations decreased beyond this range. During the O₃ episodic period, O₃ was transported downward to the ground~level from noon to afternoon. This superposition of near-surface ozone and ground-level ozone aggravates ground-level O₃ pollution, leading to an exceedance of air quality standard for O₃ at both near-surface and ground-level. The O₃ below 800m was relatively constant at night and in the early morning. Ground-level O₃ increased rapidly after sunrise until reaching a peak in the afternoon. O₃ decreased gradually in the later afternoon. The backward trajectories clustering analysis showed that there was a similarity in the clusters of air masses at 10m, 500m, and 1000m. Air masses that traveled along the coastline of Fujian and Zhejiang provinces at 500m exhibited higher O₃ than the air masses from the ocean at 10m. That was related to the transport accumulation of the precursors and the stronger ultraviolet radiation at 500m. During the episodic events, the near-surface air masses exhibited an unchanged height. The downdraft in the middle and upper boundary layer led to the accumulation of O₃ precursor near 500m. That was one of the reasons for the high O₃ near 500m observed in two typical pollution episodes.

Key words： differential absorption lidar ozone pollution meteorological factor vertical distribution Jiaxing

Received: 08 March 2020

PACS:

X515

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	Articles by authors
	HE Guo-wen
	WU Dui
	WU Cheng
	LI Mei
	DENG Tao
	WU Wei-chao
	LI Li
	CHENG Peng
	YUAN Qian
	ZHANG Ying-long
	SONG Lang
	SUN Jia-yin
	TAO Li-ping
	LIANG Yue
	TAN Jian
	ZHOU Zhen

Cite this article:

HE Guo-wen,WU Dui,WU Cheng等. Characterizing the near-surface vertical variations of summertime O₃ in Jiaxing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4265-4274.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4265

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