甘肃省区域颗粒物时空分布特征及传输路径

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Abstract Based on the monitoring data of particulate matter mass concentration, the spatial-temporal variation and emission characteristics of atmospheric particulate matter concentration were analyzed across the Gansu Province for the time period of 2018~2019, with a focus of the transport path of particulate matter using the HYSPLIT backward trajectory model. The results suggested that:Different spatial distribution of PM₁₀ and PM_2.5 were shown across the Gansu Province with a significant regional dependency. The peak value of PM₁₀ concentration was located at the Hexi Corridor area, with a strong step-decreasing from north to south. While, the high value center of PM_2.5 concentration was observed over Longzhong region, which experienced a extending decreasing to the north and south. Furthermore, Longnan region was identified as the noticeable clean area of particulate matter across the Gansu Province. Significant discrepancies were found in the seasonal variation of PM₁₀/PM_2.5 concentrations among different regions. The similar seasonal patterns of PM₁₀/PM_2.5 concentration were found over central Gansu, eastern Gansu and southern Gansu, with the concentration of PM₁₀ and PM_2.5 both peaking in winter (winter) but plunging in summer (autumn) at Longzhong and Longdong (Longnan). However, different seasonal variations of PM₁₀ and PM_2.5 concentrations were found over Hexi Corridor, where PM_2.5 was found to be experiencing high concentration in winter and low in summer, but high concentration of PM₁₀ was shown in spring and low in summer. The backward trajectory clustering results showed that the Gansu province was strongly governed by the west air current which come from central Asia and Xinjiang, especially in spring and winter time. This path is considered to be a typical dust transport pathway across the Gansu Province when considering the higher concentration of PM₁₀ than others, with which affecting. the four regions in the order of Hexi > Longzhong > Longdong > Longnan. The eastern path from Shanxi, Sichuan & Chongqing with PM_2.5/PM₁₀ ratio over 0.5which is significantly higher than the western one was deemed to be the dominant transmission path in Longnan area, which indicated that the contribution of man-made source pollution along the eastern path is significant. The results of this study can serve as a scientific reference for comprehensively understanding the characteristics of particulate pollution in the Gansu Province, formulating regional particulate pollution prevention and regional cooperative governance policies.

Key words： particulate matter spatial and temporal distribution PM_2.5/PM₁₀ HYSPLIT model transmission path

Received: 26 January 2020

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X513

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	GUO Chun-ye
	WANG Ying
	LIU Hao
	LIU Yang
	WANG Si-tong
	LI Bo

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GUO Chun-ye,WANG Ying,LIU Hao等. Spatial and temporal distribution characteristics and transport path analysis of regional particulate matter over Gansu Province[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 3990-4000.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/3990

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