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NUMERICAL EXPERIMENTS ON THE INFLUENCES OF GENERAL CIRCULATION ANOMALY OVER THE TIBETAN PLATEAU AND SURFACE ALBEDO CHANGE IN NORTHWEST CHINA ON SUMMER PRECIPITATION

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Acta meteorologica Sinica 1998年第3期12卷 311-320页

作者：孙国武俞亚勋王宝灵冯建英 Lanzhou Arid Meteorological Institute Lanzhou 730020

An advanced three-level global atmospheric general circulation model has been used to study the summer precipitation anomaly in Northwest *** on the synoptic fact and the statistical analysis of the precipitation,the surface albedo in Northwest China,and the synoptic systems over the Tibetan(Qinghai-Xizang)*** results show that either the anticyclone intensified over the plateau or the surface alhedo enhanced in Northwest China results in summer precipitation reduction east of Northwest *** both of them appear simultaneously,summer precipitation was obviously reduced and severe drought occurred in most areas of Northwest *** simulated difference of precipitation rate of Northwest China is similar to the actural precipitation distribution in Northwest China in 1995,which is the most severe drought year in Northwest China in the past fifty *** the tendency in drought severity intensified,drought frequency accelerated,drought persistence period extended,and drought areas expanded in Northwest China in recent years is maybe a result of the influences of human activities(*** was reduced,and desertification worsened)on drought circulation pattens over the Tibetan Plateau.

关键词： Tibetan Plateau Northwest China general circulation model(GCM) surface albedo change

WATER VAPOR CONTENT AND MEAN TRANSFER IN THE ATMOSPHERE OVER NORTHWEST CHINA

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Acta meteorologica Sinica 2001年第2期15卷 191-204页

作者：俞亚勋吴国雄王宝灵董安祥白虎志 Lanzhou Arid Meteorological Institute Lanzhou 730020 Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100080 Lanzhou Arid Meteorological Institute Lanzhuo 730020 Lanzhou Center Meteorological Observatory Lanzhou 730020

The interannual and intermonthly climatic features of the water vapor content(hereafter WVC)and its mean transfer in the atmosphere over Northwest China(hereafter NWC)are calculated and analyzed by using the NCEP/NCAR global reanalysis grid data(2.5°×2.5°Lat/Lon) for 40 years(1958—1997).The results show that the WVC in the total air column over NWC in four seasons of the year is mainly concentrated on eastern and western NWC *** the average,the WVC over eastern NWC decreases obviously during recent forty years except for *** it decreases over western NWC in the whole *** the WVC over NWC has been increasing since late 1980s in *** water vapor comes from the southwestern warm and wet air current along the Yarlung Zangbo River Valley and the Bay of *** from mid- western Tibetan Plateau and also from the Qinling Mountains at southern Shaanxi *** yearly water vapor divergence appears over the middle of NWC to northern Xinjiang and southeastern Shaanxi *** yearly water vapor convergence appears over the Tarim Basin and the Tibetan Plateau as well as western Sichuan and southern Gansu.

关键词： Northwest China(NWC) water vapor content(WVC) mean water vapor transfer climatic variation

一次高炮防雹效果的CINRAD／CC产品分析

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一次高炮防雹效果的CINRAD／CC产品分析

中国气象学会雷达气象学与气象雷达委员会第二届学术年会

作者：刘治国陶健红王学良俞亚勋王锡稳杨建才王勇王志宇兰州中心气象台甘肃省干旱气候变化与减灾重点实验室兰州中心气象台甘肃省干旱气候变化与减灾重点实验室甘肃省兰州市气象局中国气象局兰州干旱气象研究所兰州中心气象台甘肃省干旱气候变化与减灾重点实验室兰州中心气象台甘肃省干旱气候变化与减灾重点实验室兰州中心气象台甘肃省干旱气候变化与减灾重点实验室兰州中心气象台甘肃省干旱气候变化与减灾重点实验室

本文结合2005年6月25日祁连山东部一次高炮消雹试验,利用新一代天气雷达高时空分辨率资料,从消雹前后雷达回波外形特征、垂直最大回波强度、回波顶高、雹云内部水平风场、垂直结构、最大垂直累积液态含水量的变化以及地面降水实况等方... 详细信息

本文结合2005年6月25日祁连山东部一次高炮消雹试验,利用新一代天气雷达高时空分辨率资料,从消雹前后雷达回波外形特征、垂直最大回波强度、回波顶高、雹云内部水平风场、垂直结构、最大垂直累积液态含水量的变化以及地面降水实况等方面进行了检验分析。结果表明,（1）高炮消雹抑制雹云的发展主要存在两方面作用:一是AgI在爆炸点附近快速四周散播,并与周围冻滴快速碰并而减少冻滴的平均质量和直径,二是炮弹爆炸动力抑制爆炸点下方附近上升气流的发展;（2）高炮消雹在有效抑制冰雹云发展的同时,有利于地面降水的产生,起到人工增雨的效果,对此次消雹过程而言,假设空中液态水以雨滴形式全部降到地面,消雹后地面降水将增加4．69％。

关键词：高炮消雹新一代天气雷达效果检验

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一次人工催化雹云的效果分析

甘肃农业 2003年第12期 72-72页

作者：孙旭映俞亚勋渠永兴闫敬泽中国气象局兰州干旱气象研究所 730020

20 0 2年 7月 2 2日在距永登县雷达测站(1 0 3°45'E ,36°1 5'N ,拔海高度 2 1 1 8.8km)中心30Km的范围内发生了一次降雹过程。本文根据这次对流云群谱发生在以雷达站为中心 ,总面积在 1 1 30 4 0 0K 范围内的雷达回波资料 ,从人工催... 详细信息

20 0 2年 7月 2 2日在距永登县雷达测站(1 0 3°45'E ,36°1 5'N ,拔海高度 2 1 1 8.8km)中心30Km的范围内发生了一次降雹过程。本文根据这次对流云群谱发生在以雷达站为中心 ,总面积在 1 1 30 4 0 0K 范围内的雷达回波资料 ,从人工催化防雹效果的角度 ,从作业前、中、后期对该回波的演变特征进行了初步分析。结果表明 :利用数字化雷达指挥人工高炮防雹作业 ,对人工催化防雹时机选择在对流云的发展期具有一定的指导意义 ,并且防雹效果显著。

关键词：农业灾害冰雹人工催化防雹流云发展期减灾措施防雹效果