Analysis of meteorological conditions of a continuous heavy pollution process affecting Lanzhou

YE Yan-hua; ZHANG Ning; WANG Ji-xin; GAN Ze-wen; TIAN Yi-nan

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6281-6289.

Air Pollution Control

Analysis of meteorological conditions of a continuous heavy pollution process affecting Lanzhou

YE Yan-hua¹, ZHANG Ning¹, WANG Ji-xin², GAN Ze-wen¹, TIAN Yi-nan¹

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Abstract

Based on the analysis of a persistent heavy pollution process in Lanzhou from March 14 to 21 in 2021, several conclusions were drawn that the main pollutant was PM₁₀, and the main source was imported dust, there were three sand-releasing processes in the west of Hexi, the west of Inner Mongolia and the middle of Mongolia. The main reasons for the long and heavy pollution process was that the dust continuous input and slowly settled. The main transport routes were Hetao-Ningxia-Lanzhou and Alxa-Southern Ningxia-Lanzhou. The height of dust transport was mainly 1.5~3km. The location and moving direction of the upper surface wind speed, the great value of mixed layer thickness and the local dry and warm index could help to predict dust weather in Lanzhou.

Key words

dust transport / heavy pollution process / mixed layer thickness / persistent dust weather / stability Index

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YE Yan-hua, ZHANG Ning, WANG Ji-xin, GAN Ze-wen, TIAN Yi-nan. Analysis of meteorological conditions of a continuous heavy pollution process affecting Lanzhou[J]. China Environmental Science. 2023, 43(12): 6281-6289

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