A new convective cloud field model based on principles of self-organisation
A new convective cloud field model based on principles of self-organisation
复制标题
基于自组织原理的新型对流云场模型
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
H. Graf
中科院分区：
文献类型：
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作者：
F. Nober;H. Graf
本文提出了一种新的积云对流参数化。与其他对流方案不同，参数化使用显式光谱方法，并针对每个对流事件确定与给定垂直温度和湿度剖面有关的新云分布函数。这是通过使用一维云模型创建一系列不同的云来完成的。考虑 AGCM 中所有非对流物理过程与所有不同云之间的相互作用来计算自洽云谱。该模型已在 ECHAM5 AGCM 中实施，并针对大涡模拟模型进行了测试。 AGCM 对浅层积云场的表示可以得到很大改善。新对流方案确定的日循环、云量、液态水路径和质量通量的垂直结构接近于大涡模拟，而标准对流方案未能模拟该对流事件。
A new cumulus convection parameterisation is presented in this paper. The parameterisation uses an explicit spectral approach and determines, unlike other convection schemes, for each convection event a new cloud distribution function regarding to the given vertical temperature and humidity profiles. This is done by using a one dimensional cloud model to create a spectrum of different clouds. The interaction between all non convective physical processes in the AGCM and all different clouds is taken into account to calculate a selfconsistent cloud spectrum. The model has been implemented in the ECHAM5 AGCM and tested against a large eddy simulation model. The representation of a shallow cumulus cloud field by the AGCM could be much improved. Diurnal cycle, cloud cover, liquid water path and the vertical structure of the mass flux, determined by the new convection scheme are close to the large eddy simulation, whereas the standard convection scheme failed in simulating this convection episode.