利用HYSPLIT模型研究珠三角地区VOCs时空分布特征

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Abstract Based on the long time observation of VOCs at Guangdong Atmospheric Supersite (GAS) in the four seasons of 2016, 2142 sets of valid data were obtained. Using HYSPLIT model, the spatial and temporal distribution characteristics of VOCs in the Pearl River Delta region were analyzed. Mixing ratios and chemical reactivities of VOCs had obvious seasonal variation characteristics. The average concentration of VOCs was (18.523±20.978)×10^-9 during the observation period. Though the mixing ratios of C2~C5 alkenes and BTEX accounted for only 46%, they contributed 85% of·OH loss rate (L_OH)、82% of Ozone Formation Potential (OFP) and 97% of Secondary Oragnic Aerosol Formation Potential (SOAFP). The observation sites were mainly affected by the air masses from the northern inland areas (1#), the western inland areas (2#), the southern tip of the Taiwan Strait (3#) and the southern marine areas (4#). The mixing ratios of alkynes and BTEX of 1# air masses were both the highest, respectively, 10% and 37%, and the concentration of C2~C5 alkanes of 3# air masses was the highest, reaching (8.437±5.561)×10^-9. By estimating the chemical reactivities of VOCs of air masses, it was found that the chemical reactivities of VOCs of 1# air masses were the strongest, and their contributions to O₃ and SOA production were the highest. The chemical reactivities of VOCs of air masses of 1#, 2#, 3# and 4# were mainly contributed by BTEX and C2~C5 alkenes.

Key words： secondary organic aerosol ·OH loss rate ozone formation potential secondary oragnic aerosol formation potential trajectory clustering

Received: 26 February 2020

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X513

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	ZHANG Tao
	WANG Xin-ming
	ZHOU Yan
	YUE Ding-li
	CHEN Duo-hong
	OU Yu-bo

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ZHANG Tao,WANG Xin-ming,ZHOU Yan等. Spatial and temporal distribution characteristics of VOCs in the Pearl River Delta region using HYSPLIT model[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4216-4223.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4216

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