| Atmospheric boundary layer (ABL) is an air layer in the bottom of troposphere, it's lower interface is directly connected with the surface of the earth. And it is a media in which the material and energy exchange between atmosphere and the earth serface. Natural phenomenon and atmospheric pollution we always saw occur in this layer of atmosphere.As the acceleration of urbanization in the twenty-first century, the development of individual cities has reached "bottleneck", thus urban agglomeration in the economic circle development becames necessary, Chengdu Economic Circle(CDEC) is formed in such a big background.Meanwhile, air pollution control was also promoted to a macro platform, that is jiont prevention and control. To do so of air pollution we must find the regular of air pollutants conveying in the CDEC,but the pollutants convey and diffuse in the ABL,so we must survey the ABL features among the agglomeration. The circle originally included a large scope of cities of Chengdu, Mianyang, Meyang, Ziyang and Meishan, the so-called mesoscale cities. The atmosphere flow in mesoscale ABL of Urban agglomeration is complex, in a turbulent status. At home and-abroad, after many years study the scientists concluded a series of atmospheric motion equations which contain atmospheric boundary characteristic parameters. It is not easy using analytic methods to solve the equations, up to now we can research atmospheric boundary layer by using the numerical simulation only. In this paper I used MM5-Calmet coupling numerical model to simulate CDEC mesoscale ABL meteorological characteristics, to extract the pollution meteorological conditions factors such as wind direction, wind speed, temperature, humidity and so on, then draw the outline of air flow field in CDEC, and then depict the regular of air pollutants conveying in the whole circle, at last provide references for the CDEC (urban agglomeration) atmospheric pollution research and regional layout. |
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