Impact Analysis of Atmospheric Circulation Patterns for Regional Hazes at Upper and Lower Levels in Guangxi
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Abstract:
By using the reanalysis grid data from 1980 to 2015 provided by NCEP/NCAR (National Centers for Environmental Prediction), the surface weather data of 80 stations in Guangxi, and the LambJenkinson atmospheric circulation classification method, we analyze the regular patterns of regional haze events and corresponding atmospheric circulation characteristics. The results show that the probability of hazes is the greatest while the circulation is the southeast wind type at the sealevel pressure field and west wind type at 500 hPa. The pattern with the east wind type at sealevel pressure field and the west wind type at 500 hPa makes the maximum contribution to the annual total hazes. The pattern of the southeast wind type at sea level and the west wind type at 500 hPa mainly occurs in spring, the transition period of cold air and warm air. The pattern of the cyclone type at sea level and the anticyclone type at 500 hPa mainly occurs in summer with the significantly strengthened western Pacific High and weak lowpressure on the ground. The pattern of the easterly type at sea level and west wind type at 500 hPa occurs in autumn with stable and straight circulation. The pattern of the easterly wind at sea level and anticyclone type at 500 hPa mainly occurs in winter with significantly increasing meridional circulation. The probability of hazes is the highest in winter, the lowest in summer. In the past 36 years, the haze contribution rate of east wind type at sea level and the anticyclone type at 500 hPa is increasing, which is the dominant circulation pattern for the trend of morethannormal hazes in the Guangxi.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.