Researches of Weather Pattern and Boundary Layer Structure Characteristic on Serious Air Pollution Days in Urumqi

LI Xia;YANG Jing;MA Jun;WANG Jiang;ZHAO Ke-Ming;REN Quan;ZHAO Yong

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Plateau Meteorology
Plateau Meteorology ›› 2012, Vol. 31 ›› Issue (5) : 1414.
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Researches of Weather Pattern and Boundary Layer Structure Characteristic on Serious Air Pollution Days in Urumqi

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Using the real time meteorological observational data and daily air pollution index (API) from January 2004 to April 2009, the statistics were performed with regard to temperal distribution, 500 hPa circulation pattern, surface pressure pattern and corresponding boundary layer structure on serious air pollutiondays  with daily API above Ⅳ level. The results show that the occurrence frequencies of serious air pollution lasting for one, two, three and four days are 32.2%, 23.3%, 18.5% and 11.0%,respectively. The proportion of  500 hPa zonal circulation  is relatively high with value of 86.3%, but for the meridional circulation only below 9.6% on high air pollution days. According to the location of surface high pressure center (SHPC), the occurrence frequency reaches 86.3% when Urumqi is in the rear of the SHPC, and then  the frequency of 9.6% is for the location at the bottom of the SHPC. The frequencies of the other two patterns are relatively low. The vertical structures of the average profiles such as temperature, relatively humidity and wind of grade Ⅲ air quality days are almost in agreement with that of average  profiles in winter. Furthermore, the strong temperature inversion, lower wind speed and relatively deep easterly or southeasterly flows make great contributions to formation of serious air pollution. The relationship between serious air pollution and fog is significant with the  fog occurrence frequency of 81.3%. Moreover, the air quality tends to be poor under conditions of the vertical structure with wet at low level but dry at upper level and inversion at 20:00(Beijing  time) on the  day before that day.

Key words

Serious air pollutio / Circulation situatio / Surface pressure fie / Boundary layer struc / Atmospheric profile

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LI Xia , YANG Jing , MA Jun , WANG Jiang , ZHAO Ke-Ming , REN Quan , ZHAO Yong. Researches of Weather Pattern and Boundary Layer Structure Characteristic on Serious Air Pollution Days in Urumqi. Plateau Meteorology. 2012, 31(5): 1414

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