doi:  10.3878/j.issn.1006-9895.1901.18220
华北太行山东麓一次稳定性积层混合云飞机观测研究:对流云/对流泡和融化层结构特征

Aircraft measurement of a stable stratiform cloud with embedded convection in eastern Taihang mountain of north China: characteristics of embedded convection and melting layer structure
摘要点击 201  全文点击 70  投稿时间:2018-08-30  修订日期:2019-01-18
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基金:  国家自然科学基金
中文关键词:  积层混合云  飞机观测  对流泡  融化层
英文关键词:  stratiform cloud with embedded convection, aircraft measurement, embedded convections, melting layer
                                
作者中文名作者英文名单位
亓鹏qi peng中国气象科学研究院
郭学良guo xueliang中国气象科学研究院
卢广献
段英
李宝东
吴志会
董晓波
胡向峰
杨永胜
范浩
王建恒
引用:亓鹏,郭学良,卢广献,段英,李宝东,吴志会,董晓波,胡向峰,杨永胜,范浩,王建恒.2019.华北太行山东麓一次稳定性积层混合云飞机观测研究:对流云/对流泡和融化层结构特征[J].大气科学
Citation:qi peng,guo xueliang.2019.Aircraft measurement of a stable stratiform cloud with embedded convection in eastern Taihang mountain of north China: characteristics of embedded convection and melting layer structure[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      对云中微物理过程的研究是研究云降水形成过程和人工影响降水的重要基础,目前对积层混合云的对流区/对流泡中的微物理结构了解甚少。本文利用河北省“十三五”气象重点工程-云水资源开发利用工程的示范项目(2017-2019)“太行山东麓人工增雨防雹作业技术试验” 飞机和地面雷达观测数据,重点分析研究了2017年5月22日一次典型稳定性积层混合云对流泡和融化层的结构特征。研究结果表明,此次积层混合云高层存在高浓度大冰粒子,冰粒子下落过程中的增长在不同区域存在明显差异,在含有高过冷水含量的对流泡中,冰粒子增长主要是聚并和凇附增长,而在过冷水含量较低的云区以聚并增长为主。由于聚并增长形成的大冰粒子密度低,下落速度小,穿过0℃层时间更长,出现大量半融化的冰粒子,使融化现象更为明显。镶嵌在层状云中的对流泡一般处于0℃~-10℃(高度4-6km)层之间,垂直和水平尺度约2km,最大上升气流速度可达5m s-1。对流泡内平均液态水含量是周围云区的2倍左右,小云粒子平均浓度比周围云区高一个量级,大粒子(直径800μm以上)的浓度也更高。在具有较高过冷水含量的对流泡中降水形成符合“播撒-供给”机制,但在过冷水含量较低的区域并不符合这一机制。
Abstract:
      Cloud microphysical process is one of key processes in the formation of clouds and precipitation, however, we have known few about the structure of convective region/convective bubble embedded in stratiform clouds. The characteristics of embedded convection and melting layer structure of a stable stratiform cloud with embedded convection on 22 May 2017 are investigated using aircraft and ground-based radar measurements. High concentration of large-size ice particles was found to exist in the upper part of the cloud, and the growth process of these ice particles varied in different areas when falling to the lower levels. In embedded convections ice particles grew mainly by aggregation and riming processes due to the existence of high supercooled liquid water content, and in clouds lack of supercooled liquid water their growth depended on the aggregation process. As a result, the large-size ice particles formed by aggregation were of lower density and less falling velocity, and they took longer time to fall through the 0℃ layer, so that more obvious melting phenomena were observed in these clouds than embedded convections. The convections embedded in stratiform clouds were generally located between 0℃~ -10℃ (4~6km), with vertical and horizontal scales of about 2km, and maximum updraft velocity of 5m s-1. In embedded convections, the average liquid water content is about twice that of surrounding clouds, and the average concentration of small cloud particles is one order of magnitude higher than that of surrounding clouds, the concentration of large particles (diameter greater than 800μm) is higher too. The precipitation growth in embedded convections with high supercooled liquid water content took place through the “seeder-feeder” process, while clouds with low supercooled liquid water content did not follow this process.
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