摘要
在第一部分研究工作的基础上，为便于分析，将冰雹的２１档按照一般关于冰雹分类的定义重新划分为 ５类：小冰粒子（直径Ｄ＜１ｍｍ、霰与雹胚（１ｍｍ＜Ｄ＜５ ｍｍ）、小雹（５ｍｍ＜Ｄ＜１０ｍｍ）、典型雹（１０ｍｍ＜Ｄ＜２５ｍｍ）、大雹（Ｄ＞２５ｍｍ）。研究了每一类粒子的分布及演变特征。并给出了悬垂区、云砧、上下气流区等冰雹粒子谱分布及演变情况，提出了多单体雹暴中各尺度的冰粒子通过主次单体之间的运动循环机制对冰雹形成及增长的作用及贡献。最后将冰雹分档谱与Ｍａｒｓｈａｌｌ－Ｐａｌｍｅｒ 谱作了比较分析。
Based on the first part of this study, five sub-category divisions are made according to generally defined terminology of hail and graupel in order to simplify analyses of the 21 hail categories in the hail category model. These five re-divided sub-category divisions are: small ice particles (D< 1 mm), graupel and hail embryos (1 mm< D< 5 mm), small hailstones (5 mm< D< l0 mm), typical hail- stones (10 mm< D< 25 mm), and large hailstones (D > 25 mm). The characteristics of distribution and evolution of each category of ice particles as well as the size distribution of hail and graupel in the re- gions of overhang, anvils, up-and down-draft are presented. The mechanism of kinematical recirculation growth of ice particles of each category and the contribution to the formation and growth of hail are discussed. Comparisons of hail size distribution from hail category model and that from Marshall-Palmer assumption are also shown at the end part of this paper.
出处
《大气科学》
CSCD
北大核心
2001年第6期856-864,共9页
Chinese Journal of Atmospheric Sciences
基金
中国科学院院长基金
国科学院留学经费择优支持回国工作基金7-200052
家自然科学基金资助项目49675247
九五"
