风廓线雷达在北京地区一次强沙尘天气分析中的应用

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Abstract A sand dust period occurred from May 3 to 7 2017 was studied based on wind profiles radar data hourly, atmospheric composition data, and ground surface observation data of Beijing. As the results showed that air quality reached heavy polluted level in many places, in which the concentration of PM₁₀ reached heavy polluted level in Beijing had lasted about more than 30 hours in this sand dust period. The horizontal wind, vertical velocity and the atmospheric refraction index structure constant in boundary layer were analyzed. The main results were given as follow:wind speed of the northwest wind jet core average reached 14.8m/s in the boundary layer, and the establishment of jet core could help dust particles to transfer from upper-level to the ground. It was revealed that the ventilation index in sand dust explosion period increased 31.6% than before, and ventilation index of the middle and low layers played an important role gradually, which leaded concentration of PM₁₀ to increase explosively. In addition, the weak descending motion was the main motion, and the vertical velocity was below 1m/s in this sand dust period, while the vertical velocity could reach 5.3m/s before sand dust explosion period. Meanwhile, atmospheric refraction index structure constant reached the maximum value(1.0×10^-16). Moreover, vertical velocity and atmospheric refraction index structure constant both were earlier than variation of pollutant concentration, and which had a forecast of about 8 to 9 hours in advance, which could play a reference role in forecasting sand dust in the future.

Key words： sand dust wind profiler ventilation index vertical velocity

Received: 17 October 2017

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	Articles by authors
	LIU Chao
	ZHANG Bi-hui
	HUA Cong
	ZHANG Heng-de
	WU Dong-li

Cite this article:

LIU Chao,ZHANG Bi-hui,HUA Cong等. Application of wind profiler radar in a strong sand dust weather analysis in Beijing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1663-1669.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I5/1663

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