Development of a new hybrid cumulus parameterization scheme for use in nonhydrostatic weather prediction models

开发用于非静水力天气预报模型的新型混合积云参数化方案

• 批准号: 5426541
• 负责人: Professor Dr. Andreas Bott
• 金额: --
• 依托单位: Abteilung Meteorologie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5426541?language=en
• 关键词: Development; new; hybrid; cumulus; parameterization

The purpose of the proposed research project is to develop a new nonlocal and hybrid cumulus parameterization (NHCP) scheme for use in nonhydrostatic numerical weather prediction (NWP) models. NHCP will be based on a mass flux approach. By implementing NHCP in a NWP model the following forecast skills shall be improved: i) spatial and temporal distribution of convective clouds and precipitation, ii) stratiform precipitation as induced by convective overturning, iii) subgrid-scale peak values of convective precipitation, iv) mesoscale organization of cumulus convection. The nonlocal character of the NHCP scheme is given by the fact that the evolving cumulus cloud will not be fixed to a particular grid point, instead it may be transported over several grid points so that cloud mass fluxes are locally not balanced. Furthermore, cumulus convection will be treated in a hybrid way, that is only parts of a cumulus convection event will be parameterized, certain cloud processes will be directly considered in the dynamic model. During the first two years of the proposed research the principle core of the NHCP scheme shall be developed.

研究项目的目的是发展一种新的非局地混合积云参数化(NHCP)方案，用于非静力数值天气预报(NWP)模式。NHCP将以质量流方法为基础。通过在NWP模式中实施NHCP，将提高以下预报技巧：1)对流云和降水的时空分布，2)对流翻转引起的层状降水，3)对流降水的亚网格尺度峰值，4)积云对流的中尺度组织。NHCP方案的非局地特征是，演变的积云不会固定在一个特定的网格点上，而是可以通过几个网格点输送，从而使云质量通量在局部不平衡。此外，积云对流将以混合的方式处理，即只对积云对流事件的部分进行参数化，某些云过程将直接在动力模式中考虑。在拟议研究的头两年期间，应制定NHCP计划的原则核心。