塔克拉玛干沙漠南缘沙尘气溶胶的垂直分布及其传输特征

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Abstract The seasonal vertical distribution of aerosols in the southern margin of the Taklamakan Desert was analysed using aerosol LiDAR data from the Minfeng meteorological station from June 2023 to May 2024, and the HYSPLIT backward trajectory model was employed to identify the transport paths of aerosols at different altitude layers. Finally, the vertical distribution of aerosols and their transport paths at different stages of dust pollution are analysed by taking a dust pollution event as an example.The results show that: ①The dust aerosols can be lifted up to a maximum height of 3~4km (4.4~5.4km above sea level) above the ground surface, which is comparable to the average elevation of the Tibetan Plateau (>4km), and suggests the possibility of transport of dust aerosols from the study site to the outside of the Tarim Basin. ②The extinction coefficients of the four seasons show a decreasing trend with height in the vertical direction, and the maximum values are all located at the low altitude of 150m. The highest values are found in spring (0.69km^-1, 0.20), followed by winter (0.52km^-1, 0.18) and summer (0.40km^-1, 0.16), and the lowest values are found in autumn (0.25km^-1, 0.11). ③The dust aerosols are mainly affected by the east-west transport, except for the 1500 and 3000m altitude layers in winter which are affected by the westerly transport, the 500, 1500 and 3000m altitude layers in the rest of the seasons are affected by the northeasterly and westerly transport at the same time. ④The extinction coefficients carried by the northeasterly jet are significantly higher than those carried by the westerly jet at different altitudes in all seasons, making the northeasterly jet the main dust transporting jet. ⑤The study of a dust pollution event shows that the extinction coefficient of the near-surface aerosols is greater than 1km^-1, the depolarization ratio exceeds 0.3, and the vertical trend is decreasing with height during the dust pollution process. The northeastern airflow in the Tarim Basin is the main transport airflow for dust aerosols during this dust event.

Key words： dust aerosols LiDAR vertical distribution HYSPLIT model Minfeng

Received: 25 October 2024

PACS:

X515

Corresponding Authors: 何清,责任作者,研究员,qinghe@idm.cn E-mail: qinghe@idm.cn

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	LI Jing-jing
	HE Qing
	ZHANG Hai-liang
	XU Yue-yue

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LI Jing-jing,HE Qing,ZHANG Hai-liang等. Vertical distribution and transport characteristics of dust aerosols in the southern edge of the Taklamakan Desert[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(4): 1844-1857.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I4/1844

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