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Engineering    2017, Vol. 3 Issue (2) : 266 -271
Research |
Environmental and Dynamic Conditions for the Occurrence of Persistent Haze Events in North China
Yihui Ding1(),Ping Wu1,2,3,Yanju Liu1,Yafang Song1
1. National Climate Center, Beijing 100081, China
2. Chinese Academy of Meteorological Sciences, Beijing 100081, China
3. College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China

This paper presents a concise summary of recent studies on the long-term variations of haze in North China and on the environmental and dynamic conditions for severe persistent haze events. Results indicate that haze days have an obviously rising trend over the past 50 years in North China. The occurrence frequency of persistent haze events has a similar rising trend due to the continuous rise of winter temperatures, decrease of surface wind speeds, and aggravation of atmospheric stability. In North China, when severe persistent haze events occur, anomalous southwesterly winds prevail in the lower troposphere, providing sufficient moisture for the formation of haze. Moreover, North China is mainly controlled by a deep downdraft in the mid-lower troposphere, which contributes to reducing the thickness of the planetary boundary layer, obviously reducing the atmospheric capacity for pollutants. This atmospheric circulation and sinking motion provide favorable conditions for the formation and maintenance of haze in North China.

Keywords North China      Persistent haze events      Environmental conditions      Dynamic conditions     
Corresponding Authors: Yihui Ding   
Just Accepted Date: 13 March 2017   Online First Date: 07 April 2017    Issue Date: 27 April 2017
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Yihui Ding,Ping Wu,Yanju Liu, et al. Environmental and Dynamic Conditions for the Occurrence of Persistent Haze Events in North China[J]. Engineering, 2017, 3(2): 266 -271 .
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