摘要
本文利用复杂地形条件下的嵌套细网格预报模式和1979年FGGEⅢ_b级资料对郭型积云对流参数化方案中的垂直加热分布函数及增湿系数进行了对比试验,並讨论了潜热加热效应。 结果表明,在四种垂直加热分布函数中,θ_(se)差方案主要加热出现在对流层高层,这使气柱渐趋稳定,最后抑制积云对流发展,预报效果较好。在三种增湿系数方案中,以分段线性函数法为好,它计算的b值分布合理,预报效果也好。因水汽凝结潜热加热将使气柱平均温度升高,上升运动加强,对流层中低层降压辐合,使对流层高层加压辐散。
In this paper a nested fine mesh model under complex terrain condition and the FGGE level-IIIb data in 1979 were utilized to conduct some comparison experiments of both vertical heating distribution functions and moistening coefficients of Kuo type cumulus parameterization scheme for a chosen case with heavy rain. The effects of condensation latent heating were also analysed.
The results show the θ1e difference scheme is the best one in four kinds of vertical heating distribution functions chosen in the paper. Its main heating appears at upper layer of troposphere, it causes the air columns to become stable gradually, suppresses the developments of cumulus convection finally, and has a good performance. The section-to-section linear function scheme is the best in three kinds of moistening coefficients chosen here. The calculated moistening coefficient, b, according to it is reasonable and has a good forecast as well.
Heating of condensation latent heat of water vapour will make mean temperature of air columns rise, upward motion intensify, air flow converge and pressure decrease on lower troposphere, air flow diverge and pressure increase on upper troposphere.
出处
《高原气象》
CSCD
北大核心
1989年第3期217-227,共11页
Plateau Meteorology
基金
国家重点科技攻关项目75-09-01课题资助课题
关键词
积云
对流参数化
潜热加热效应
Cumulus parameterization
Latent heating
Vertical heating distribution function
Moistening coefficient
