In this paper,the data of continuous atmospheric vertical integral vapour and liquid water content during April-June of 1992-1994 obtained by a ground-based dual-channel microwave radiometer are used to analyse the st...In this paper,the data of continuous atmospheric vertical integral vapour and liquid water content during April-June of 1992-1994 obtained by a ground-based dual-channel microwave radiometer are used to analyse the statistical characteristics of atmospheric vapour and liquid water content,and the relative distribution characteristics of vapour and liquid water content in cloudy atmosphere,the correlative relation of integral liquid water content L and ground precipitation intensity I.and precipitation transform rate of precipitation system.Finally,the weather modification condition of precipitus stratiform clouds and seeding potential is analyzed and discussed.展开更多
[Objective] The research aimed to study the first spring soaking rain weather and its precipitation enhancement potential forecast in Jinzhou area in 2010. [Method] From the weather situation characteristics, main inf...[Objective] The research aimed to study the first spring soaking rain weather and its precipitation enhancement potential forecast in Jinzhou area in 2010. [Method] From the weather situation characteristics, main influence system, forecast service, artificial precipitation enhancement operation and so on, the first spring soaking rain weather process in Jinzhou area in 2010 was summarized comprehensively. [Result] The weather situation characteristics of soaking rain were that the high-altitude cold air was weak, and the low-level warm wet airflow was obvious. The main influence systems were the high-altitude trough, the high-altitude shear line and the ground Mongolian cyclone. The ground inverted trough system advanced northward and got through with the same phase of Mongolian cyclone, which provided the certain energy and water vapor for the precipitation in Jinzhou area. It was one of key reasons for generating the soaking rain. The numerical forecast product played the certain guidance role in the forecast service work. The situation field forecast was accurate, but the precipitation forecast deviation was big. Therefore, the forecast service couldn’t depend on the numerical forecast product simply and totally, and should combine with the actual monitoring data to analyze and apply comprehensively. [Conclusion] The research played the safeguarding role in carrying out the large-scale artificial precipitation enhancement operation successfully in the whole area of Jinzhou.展开更多
利用欧洲预报场、GRAPES模式预报及雷达等资料,分析2017年4月4日河南省人工影响天气中心开展的一次人工增雨作业过程。结果发现,低槽东移是此次降水的主要影响系统;此次过程全省大部分地区均有过冷水存在,北部、中部垂直累积过冷水含量...利用欧洲预报场、GRAPES模式预报及雷达等资料,分析2017年4月4日河南省人工影响天气中心开展的一次人工增雨作业过程。结果发现,低槽东移是此次降水的主要影响系统;此次过程全省大部分地区均有过冷水存在,北部、中部垂直累积过冷水含量较高,中部地区作业潜力最好;增雨作业结束后30 min,作业区及下风向回波增强,30 d Bz以上强回波区范围增大;比较对比区降水量,增雨效果显著。展开更多
利用常规气象观测资料、自动站观测资料和探空资料等,对所选取的2004—2013年共78例降水过程进行分析,将中部区域春秋季降水过程分为3个类型:低槽/切变线冷锋型、低涡(西南涡/西北涡)气旋型、低槽/切变线冷高压型。统计结果表明,中部区...利用常规气象观测资料、自动站观测资料和探空资料等,对所选取的2004—2013年共78例降水过程进行分析,将中部区域春秋季降水过程分为3个类型:低槽/切变线冷锋型、低涡(西南涡/西北涡)气旋型、低槽/切变线冷高压型。统计结果表明,中部区域春秋季降水出现概率最多的类型依次为切变线冷锋型、低槽冷锋型和西南涡类型,各天气类型的雨区移动方向均以自西向东为主,低层700 h Pa和850 h Pa多存在西南或偏南急流,水汽主要来自于孟加拉湾。分析中部区域3种主要降水类型特征及其增雨潜力区位置发现:1)低槽冷锋类型降水一般出现在500 h Pa和700 h Pa低槽前部、地面冷锋后部,多为连续性降水;其增雨潜力区主要位于500 h Pa低槽前部、700h Pa槽前和西南急流出口区的左侧,以及地面冷锋后部或锋线附近区域。2)切变线冷锋类型降水多出现在地面冷锋后部、低层切变线两侧附近;其增雨潜力区主要位于700 h Pa和850 h Pa两切变线之间且较靠近700 h Pa切变线一侧、急流出口左侧的带状区域。3)西南涡波动类型降水一般出现在低涡中心及700 h Pa暖式切变线两侧附近,降水持续时间较长;其增雨潜力区主要位于700 h Pa和850 h Pa低涡中心附近及暖式切变线北侧区域。展开更多
西南涡天气降水是中部区域春、秋季飞机人工增雨最主要的三种作业天气类型之一。利用常规气象观测资料和NCEP再分析资料,对2008年4月8 9日和2009年4月18 19日两次典型西南涡降水天气过程对比分析发现,近圆形和椭圆形西南涡的动力场结构...西南涡天气降水是中部区域春、秋季飞机人工增雨最主要的三种作业天气类型之一。利用常规气象观测资料和NCEP再分析资料,对2008年4月8 9日和2009年4月18 19日两次典型西南涡降水天气过程对比分析发现,近圆形和椭圆形西南涡的动力场结构存在一定差异。对增雨条件分析发现:两次过程500 h Pa上都存在大气垂直上升运动,低层水汽条件良好;500 h Pa冰面过饱和水汽压正值区均在低涡形成并影响中部区域时开始出现,并随低涡移动发展。因此,选择500 h Pa冰面过饱和水汽压≥0 h Pa且垂直上升速度≤-0.1 Pa·s-1的区域作为增雨潜力区。其中,近圆形西南涡过程增雨潜力区出现在低涡中心前方附近和暖式切变线北侧、低涡闭合线处,椭圆形西南涡过程增雨潜力区位于辐合线北端及低涡闭合线东北方向一定距离处。展开更多
基金Natural Science Foundation of China Meteorological AdministrationNatural Science Foundation of Hebei Province(493128).
文摘In this paper,the data of continuous atmospheric vertical integral vapour and liquid water content during April-June of 1992-1994 obtained by a ground-based dual-channel microwave radiometer are used to analyse the statistical characteristics of atmospheric vapour and liquid water content,and the relative distribution characteristics of vapour and liquid water content in cloudy atmosphere,the correlative relation of integral liquid water content L and ground precipitation intensity I.and precipitation transform rate of precipitation system.Finally,the weather modification condition of precipitus stratiform clouds and seeding potential is analyzed and discussed.
文摘[Objective] The research aimed to study the first spring soaking rain weather and its precipitation enhancement potential forecast in Jinzhou area in 2010. [Method] From the weather situation characteristics, main influence system, forecast service, artificial precipitation enhancement operation and so on, the first spring soaking rain weather process in Jinzhou area in 2010 was summarized comprehensively. [Result] The weather situation characteristics of soaking rain were that the high-altitude cold air was weak, and the low-level warm wet airflow was obvious. The main influence systems were the high-altitude trough, the high-altitude shear line and the ground Mongolian cyclone. The ground inverted trough system advanced northward and got through with the same phase of Mongolian cyclone, which provided the certain energy and water vapor for the precipitation in Jinzhou area. It was one of key reasons for generating the soaking rain. The numerical forecast product played the certain guidance role in the forecast service work. The situation field forecast was accurate, but the precipitation forecast deviation was big. Therefore, the forecast service couldn’t depend on the numerical forecast product simply and totally, and should combine with the actual monitoring data to analyze and apply comprehensively. [Conclusion] The research played the safeguarding role in carrying out the large-scale artificial precipitation enhancement operation successfully in the whole area of Jinzhou.
文摘利用欧洲预报场、GRAPES模式预报及雷达等资料,分析2017年4月4日河南省人工影响天气中心开展的一次人工增雨作业过程。结果发现,低槽东移是此次降水的主要影响系统;此次过程全省大部分地区均有过冷水存在,北部、中部垂直累积过冷水含量较高,中部地区作业潜力最好;增雨作业结束后30 min,作业区及下风向回波增强,30 d Bz以上强回波区范围增大;比较对比区降水量,增雨效果显著。
文摘利用常规气象观测资料、自动站观测资料和探空资料等,对所选取的2004—2013年共78例降水过程进行分析,将中部区域春秋季降水过程分为3个类型:低槽/切变线冷锋型、低涡(西南涡/西北涡)气旋型、低槽/切变线冷高压型。统计结果表明,中部区域春秋季降水出现概率最多的类型依次为切变线冷锋型、低槽冷锋型和西南涡类型,各天气类型的雨区移动方向均以自西向东为主,低层700 h Pa和850 h Pa多存在西南或偏南急流,水汽主要来自于孟加拉湾。分析中部区域3种主要降水类型特征及其增雨潜力区位置发现:1)低槽冷锋类型降水一般出现在500 h Pa和700 h Pa低槽前部、地面冷锋后部,多为连续性降水;其增雨潜力区主要位于500 h Pa低槽前部、700h Pa槽前和西南急流出口区的左侧,以及地面冷锋后部或锋线附近区域。2)切变线冷锋类型降水多出现在地面冷锋后部、低层切变线两侧附近;其增雨潜力区主要位于700 h Pa和850 h Pa两切变线之间且较靠近700 h Pa切变线一侧、急流出口左侧的带状区域。3)西南涡波动类型降水一般出现在低涡中心及700 h Pa暖式切变线两侧附近,降水持续时间较长;其增雨潜力区主要位于700 h Pa和850 h Pa低涡中心附近及暖式切变线北侧区域。
文摘西南涡天气降水是中部区域春、秋季飞机人工增雨最主要的三种作业天气类型之一。利用常规气象观测资料和NCEP再分析资料,对2008年4月8 9日和2009年4月18 19日两次典型西南涡降水天气过程对比分析发现,近圆形和椭圆形西南涡的动力场结构存在一定差异。对增雨条件分析发现:两次过程500 h Pa上都存在大气垂直上升运动,低层水汽条件良好;500 h Pa冰面过饱和水汽压正值区均在低涡形成并影响中部区域时开始出现,并随低涡移动发展。因此,选择500 h Pa冰面过饱和水汽压≥0 h Pa且垂直上升速度≤-0.1 Pa·s-1的区域作为增雨潜力区。其中,近圆形西南涡过程增雨潜力区出现在低涡中心前方附近和暖式切变线北侧、低涡闭合线处,椭圆形西南涡过程增雨潜力区位于辐合线北端及低涡闭合线东北方向一定距离处。
