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Using Synoptic Classification and Trajectory Analysis to Assess Air Quality during the Winter Heating Period in rümqi, China

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Advances in Atmospheric Sciences 2012年第2期29卷 307-319页

作者： WANG Lili WANG Yuesi SUN Yang LI Yuanyuan State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China Xinjiang Weather Office Ürümqi830002China

Synoptic patterns identified by an automated procedure employing principal- component analysis and a two-stage cluster analysis, and backward trajectory analysis clustered by the HYSPLIT4.9 model were used to examine air quality patterns over¨ Uru¨mqi, China, one of the most heavily polluted cities in the world. Six synoptic patterns representing different atmospheric circulation patterns and air-mass characteristics were classified during the winter heating periods from 2001 to 2008, and seven trajectory clusters representing different paths of air masses arriving at ürümqi were calculated during the winter heating periods from 2005 to 2008. Then air quality was evaluated using these two approaches, and significant variations were found across both synoptic patterns and trajectory clusters. The heaviest air-pollution episodes occurred when ürümqi was either in an extremely cold, strong anticyclone or at the front of a migrating cyclone. Both conditions were characterized by with light winds, cold, wet surface air, and relatively dry upper air. ürümqi was predominately influenced by air masses from the southwest and from local areas. Air pollution index （API） levels were highest for air masses originating from the southwest with a longer path or for the local area, because of transport from semi-desert/desert regions by strong winds and because of local heavy pollution emissions, respectively. The interactions between these two analytical approaches showed that poor diffusion conditions, together with local circulation, enhanced air pollution, besides, regional air-mass transport caused by strong winds contributed to serious air quality under relatively good diffusion conditions.

关键词： synoptic climatology backward trajectory automated meteorological classification air pollu- tion index (API) ürümqi

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Analysis on the coupling law between economic development and the environment in ürümqi city

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Science China Earth Sciences 2007年第S1期 149-158页

作者： WANG HongWei1,2, ZHANG XiaoLei1, WEI ShanFeng3 & KANG Hong4 1 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, ürümqi 830011, China 2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China 3 China National Environmental Monitoring Centre, Beijing 100029, China 4 Xinjiang Environmental Monitoring Station, ürümqi 830011, China

The inter-coupling relationship between urban economic development and the ecological environment refers to the total of interactive, inter-influenced and other non-linear relations between economic and environmental systems in the course of economic development. Taking ürümqi, an oasis city in arid region, as an example, we collected the data of environmental quality & pollutants discharge and information on economic development in the 20 years, analyzed the correlation between the two, con-ducted a fitted regression with quadratic and cubic equations, and acquired 14 mathematic models that could describe the relationship between the environment and economic development. The results show that there exists a coordinated and interactive relationship between the environment and economic development. On the basis of these quantity analyses, conceptional frame model is built to explain the fundamental basis of this environmental coupling in ürümqi city. Both a quantitative analysis of the coupling law and a good command of the internal law between them are useful for making com-prehensive decisions about the environment and economic development and harmonizing the urban sustainable development.

关键词： oasis city ürümqi environmental Kuznets curve coupling law

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