乌鲁木齐大气混合层厚度和稳定度与大气污染的关系

doi:10.12118/j.issn.1000-6060.2019.03.03

Abstract

Abstract: The meteorological observation data from four meteorological towers each of which is 100 meters high with ten layers,and [WTBX]AQI[WTBZ] observation data from seven environmental monitoring stations in Urumqi City,Xinjiang,China during the period from June 2013 to April 2014 were collected and used to analyze the characteristics of the thickness and stability of the atmospheric mixed layer in this region,and their relationship with the atmospheric pollution was also analyzed.The results indicated that the thickness of the mixed layer was higher in suburbs and lower in urban areas in summer,and it was decreased along with the decrease of the terrain from the southern suburbs to the urban areas,and then to the place of the northern suburbs in winter.The thickness of the mixed layer was between 1 559 and 1 772 meters in the summer,and it was between 526 and 1 156 meters in the winter.When the thickness of the mixed layer was measured at the interval of 500 meters from the ground up to 2 km,it had the highest frequency of emergence with the height between 500 and 1 000 meters.In terms of the monthly change it was basically above 500 meters from June to September with the probability at each height interval being more than 10%.The probability at the interval above 1 500 meters was significantly reduced from October to next February.In terms of the daily variation,it was the highest from 13:00 PM to 16:00 PM and dropped rapidly after 16:00 PM.A large sensible heat transfer provided sufficient thermal conditions during the day,which was also reflected by the fact that the unstable stratification was mainly in the daytime but the stable stratification at night.When the atmospheric stability was classified,it showed that the percentage of the unstable (AC) was almost the same between the suburban and urban areas in the summer,but in the winter the percentage of the stable (E,F) was the biggest in the northern suburbs while it was the weakest in urban areas.The AQI index was the largest in the winter,and it was increased along with the decrease of the terrain from the southern suburb to the urban area,and then to the northern suburb,which was related to the fact that there were more pollutants during the heating period,and the higher terrain in the southern suburbs is in favor of diffusing pollutants.In general,the spatial distribution of the thickness of atmospheric mixed layer was related to the meteorological elements,atmospheric stability and the terrain and it had the great influence on the distribution of AQI index.This study provided important information to the prediction of air pollution condition.

Key words: Urumqi, pollution, thickness of atmospheric mixed layer, atmospheric stability

LI Zhenjie, JIN Lili, H E Qing, MIAO Qilong, ALI Mamtimin.

Characteristics of atmospheric mixing layer height and atmospheric stability in Urumqi region and their relationship with the atmospheric pollution [J].Arid Land Geography, 2019, 42(3): 478-491.

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Characteristics of atmospheric mixing layer height and atmospheric stability in Urumqi region and their relationship with the atmospheric pollution

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