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From results of two large-eddy simulation of stratus-topped boundary layer,the structure,thermodynamic prop-erties and role of thermals are investigated by using conditional sampling methods,which divided the thermals into thewarm/moist,cool/dry,warm/dry and cool/moist events.The results show that the main turbulent circulation in thestratus-topped boundary layer is composed of the warm/moist updraft and cool/dry downdraft.Below entrainmentregion,the warm/moist updrafts and cool/dry downdrafts are,respectively,positively and negatively buoyant andcontribute most to total fluxes and variances.Evaporative cooling has important effect on the structure and thermodynamic properties of thermals instratus-topped boundary layer. 相似文献
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对流层气溶胶和云的大气辐射加热特征 总被引：5，自引：3，他引：5
本文利用建立的辐射模式研究了在一般天气和沙尘暴天气条件下,有云气溶胶大气的辐射加热特征。结果表明:在不同的天气条件下,云和气溶胶对大气的辐射加热的影响是不同的,它依赖于云的状况(云高、云厚和云内含水量)以及气溶胶浓度的大小、气溶胶的垂直分布和气溶胶的光学性质。 相似文献
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本文采用二维中尺度模式,并结合沙尘气溶胶模式研究了当沙尘暴袭击海岸时,沙尘的辐射效应对海陆风环流的强迫作用.结果表明:沙尘的辐射效应对海陆风环流的发展、变化、消亡有着重要的影响,沙尘暴区移到海陆上空不同的位置,沙尘对海陆风环流的辐射强迫作用是不同的. 相似文献
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In this paper,the frontogenesis forced by dust radiative heating and the radiative effects of an isolated duststorrn ona frontal circulation system are examined by means of two-and three-dimensional numerical models.Results indicatethat as a duststorm breaks out, frontogenesis is caused in by dust radiative heating in the lower atmosphere.A markedisentropic potential temperature layer is formed in the middle troposphere.The low-level convergence occurs along thedirection of the front movement.Atnight,dust radiative cooling results in frontolysis in the lower atmosphere.An obvious vertical circulation is forced by radiative heating of an isolated duststorm along the direction of the pre-vailing wind.It is stronger at day,weaker and reverse at night.The response of the horizontal wind field to dust radiativeforcing is different at different levels. 相似文献
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