【摘要】 应用天气尺度运动,讨论梅雨期间暴雨区内的涡度平衡。在对流层下层有一个涡度的积累,对流层上层有涡度的亏损。积云对流在涡度平衡中起重要作用。给出了一个基于一维定常积云模式的对流涡度参数化方案,并和天气尺度运动的计算结果作了比较。更多还原

【Abstract】 Synoptic-scale variables are used to determine the vorticity budget in the heavy precipitation region during the Mei-Yu season. In this region there exists a vorticity accumulation in the lower half of the troposphere and a sink in the upper troposphere. This result implies that convective-scale motion exert a significant effect on the vorticity budget and suggests that in the modelling of the summer precipitation weather systems, attention must be given to parameterizing convective effects in the momentum equation as well as in the thermodynamic energy and water mass continuity equations.A vorticity parameterization scheme for cumulus convection is derived by using a one dimensional steady cumulus model. The result is compared with that determined by synoptic-scale variables.更多还原