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Analysis of a Persistent Haze Weather Process in Western Zhejiang of the End of 2013

Lan Junqian;Wang Jianjiang;Zhang Haochuan;The Quzhou Meteorological Bureau;Meteorological observatory of Unit 94855;  
By using the conventional observation data and 6h NCEP 1°×1° reanalysis data, a persistent haze weather process in West Zhejiang during the end of 2013 was analyzed. The results indicated that the process had a relatively stable circulation of the air and the ground level with poor humidity condition at middle and low level. At low-level there was mainly a weak divergence and vertical motion, and the persistence of shallow inversion layer below 1000 hPa was conducive to the maintenance of haze.During the dry cold air effect, the increasing cold advection intensity, low layer convergence and the vertical ascending motion were the main causes of less diffusion conditions haze. The western Zhejiang is the basin topography, and is not conducive to the spread of pollutants.
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