Diurnal Variation of Atmospheric Boundary Layer in Urumqi
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Abstract:
The clear day observation data of the CFL03 wind profiler radar (WPR) collected in Urumqi are used to analyze the characteristics of the diurnal variation of the atmospheric boundary layerThe results show that the seasonal variation of the boundary layer is obviousBelow the 300-600 m height, the wind speed is weak (<3 m/s), and the nearer the surface the smaller the wind speed is While wind speed is larger, the wind direction is constant in southeast above 300 to 600 mThe wind speeds in summer and autumn are smaller than those in winter and springThe characteristics of the flow field in summer and autumn are more complex, in which the horizontal wind speed and direction are more volatile, and there is obvious wind shearThe magnitude of structural parameter of turbulence reflectivity in spring (autumn or winter) is one magnitude (three magnitudes or 1 to 3 magnitudes) less than that in summer In summer, the structural parameter of turbulence reflectivity is maximum, which is 10-16 to 10-13m-2/3Under the condition of clear sky, the dissipation rate of turbulent kinetic energy is 10-6 to 10-2, 10-4 to 10-3 and 10-6 to 10-3m2〖DK〗·s-3, respectively, in spring, summer, and autumnThe magnitude of dissipation rate of turbulent kinetic energy in daytime is one magnitude more than that at nightThe diurnal variation of structural parameter of turbulence reflectivity and dissipation rate of turbulent kinetic energy is correlated well to wind field in clear daysThat is, the region of strong turbulence development is consistent with the larger wind velocityThe diurnal boundarylayer feature in spring and summer can be better monitored by the dissipation rate of turbulent kinetic energy using a new product of WPR In summer, under the condition of clear sky, the height of the stable boundary layer, residual layer, convective boundary layer, mixed layer, and entrainment layer are 400 to 500, 1800, 2500, 2200 and 300 to 400 m, respectivelyThe diurnal variation of the boundary layer height is positively related to surface temperature
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.