单块积云对环境大气能量的转换和输送

本文建立了一个二维弹性积云数值模式,利用西太平洋考察的平均探空资料,采用能量学方法,讨论单块积云对环境大气能量的转换和传输,为积云参数化提供依据。 文中计算了积云发展演变过程中各种形式的能量的变化。结果表明在云演变过程中释放的凝结潜热是积云发展的主要能量来源,但积云对大尺度的反馈主要不是凝结潜热直接加热大气,而是通过对流及蒸发等过程使积云对流影响的整个区域内大气位势不稳定减小,而离云较远的地区层结变得更不稳定。

Transformation and rearrangement of Environmental Atmospheric Energy Caused by single Cumulus Cloud

A two-dimensional compressive numerical cloud model is established to simulate the cumulus cloud using the mean radio-sounde data obtained in the West Pacific Investigation. The energy method is adopted to discuss the transformation and rearangement of environmental atmospheric energy caused by single cumulus cloud. The results will be useful for studying the cumulus parameterization.The change of various forms of energy in the cloud evolution has been calcu -lated . The results show that although the release of condensation latent heat is the main energy source for cloud development, it does not exert influence directly on the environmental atmosphere . It is through the convection and evaporation the potential instability in the whole region of convection is decreased , and the stratification in regions far from the cloud becomes more unstable.