乌鲁木齐辖区山谷风环流特征的分析

发布时间：2018-05-17 13:04

本文选题：山谷风 + 时空分布　；参考：《干旱区地理》2016年06期

【摘要】：乌鲁木齐辖区山谷风环流对大气污染物的聚集、扩散和输送具有重要影响,采用2011-2015年33个地面自动气象站观测的逐时10 min平均风资料,分析辖区山谷风的时空分布特征。辖区内山谷风年平均日数为245 d,山风22∶00~23∶00开始出现,08∶00~11∶00结束,持续时间达10~13 h。谷风11∶00~14∶00开始出现,19∶00~21∶00结束,持续时间达6~9 h。山风和谷风的平均强度为1.1 m·s~(-1)和1.6 m·s~(-1)。山风表现为下坡风,从山脉到谷底山风强度逐渐减弱,城区为风速风向的辐合区。城南企业排放的污染物在山风的作用下,向城区聚集。谷风与山风相反,表现为上坡风,城区为风向的辐合区。城北企业排放的污染物在谷风的作用下,部分在城区和城南聚集,部分被输送出去。
[Abstract]:Valley wind circulation in Urumqi district has an important influence on the accumulation, diffusion and transport of atmospheric pollutants. The temporal and spatial distribution characteristics of valley wind in Urumqi district are analyzed by using the hourly 10 min mean wind data observed by 33 ground automatic meteorological stations from 2011 to 2015. The average annual number of days of valley wind in the area is 245 days, and the wind of the mountains starts to appear at 22: 00 or 23: 00 and ends at 08: 00, 11: 00, and lasts for 10 minutes and 13 hours. The valley wind of 11: 00 and 14: 00 began to appear at 19: 00 and ended at 21: 00 and lasted for 6 or 9 hours. The average intensity of mountain wind and valley wind is 1.1 m / s ~ (-1) and 1.6 m ~ (s-1) ~ (-1). The mountain wind shows downhill wind, the intensity of mountain wind decreases gradually from the mountain range to the valley bottom, and the urban area is the convergence area of wind speed and wind direction. Under the action of the mountain wind, the pollutants emitted by the enterprises in the south of the city gather to the urban area. Valley wind and mountain wind contrary to the performance of uphill winds, urban areas for the convergence of wind direction. Under the action of valley wind, the pollutants emitted by enterprises in the north of the city gather partly in the urban area and south of the city, and some are transported out.
【作者单位】：中国气象局乌鲁木齐沙漠气象研究所;新疆维吾尔自治区气象台;新疆维吾尔自治区人工影响天气办公室;乌鲁木齐市气象局;
【基金】：中国沙漠气象科学基金-峡口城市风场的时空分布特征及数值模拟研究(Sqj2014007)资助
【分类号】：P425;X51

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