STUDY ON APPLICATIONS OF C-BAND DUAL LINEAR POLARIZATION RADAR IN METEOROLOGY   总被引：4，自引：0，他引：4       下载免费PDF全文

徐宝祥  王致君  蔡启铭  刘黎平  张鸿发  楚荣忠 《Acta Meteorologica Sinica》1991,(3)

Theoretical study and development of a dual linear polarization weather radar in China are briefly presented.Also discussed are the potential uses of the new radar system in improving the accuracy of areal rainfall measure-ments and analysing the spacial structure of storms and distribution of hydrometecrs in clouds based on theradar observational data from the field experimcnts during the summers of 1987—1989. The results indicatethat a C-band dual polarization weather radar, after considering the microwave attenuation correction, may beemployed to quantitatively measure rainfall and to monitor heavy rain and flood events and becomes an impor-rant means to study storm structure.  相似文献   

重庆地区降水对气溶胶浓度及雨水中离子浓度的影响   总被引：1，自引：0，他引：1  

吴玉霞  沈志来 《高原气象》1991,10(1):52-60

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喜玛拉雅山脉降水分布的一种气候估算方法     

林贤超  林振耀 《高原气象》1991,10(1):88-93

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常规雷达测量回波区内部运动及与多普勒雷达的比较   总被引：1，自引：2，他引：1  

汤达章  李力 《高原气象》1991,10(2):113-122

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利用矩心跟踪法跟踪,警戒强对流天气方法初探   总被引：4，自引：2，他引：4  

刘黎平  徐宝祥 《高原气象》1991,10(3):317-324

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用C波段双线偏振雷达研究冰雹云   总被引：18，自引：1，他引：18  

刘黎平  徐宝祥  王致君 《大气科学》1992,16(3):370-376

本文计算了不同相态、不同形状的降水粒子对5.6cm,10.7cm雷达波的散射特性,并利用降水粒子散射特性及云雨雷达回波的Z_(DR)特征并结合地面降雹情况,分析并解释了1990年8月9日和8月30日甘肃省平凉两次雹暴过程的雷达RHI资料.我们推测:Z_(DR)值为负值的区域相应于降雹区,ZDR负值与大扁冰雹和小锥状冰雹关系密切;而雨区Z_(DR)具有较大正值,雨区大于5dB的Z_(DR)由直径D>0.5cm的雨滴所致.利用冰雹区和雨区Z_(DR)信息的不同可能识别降水粒子的相态.C波段双线偏振雷达和10cm波长雷达相比有独到之处:雨区Z_(DR)值较大,而冰雹区Z_(DR)值又较小,这更有利于研究云雨相态和空间结构.可以预期双线偏振雷达对防雹工作及云物理研究工作是有很大帮助的.  相似文献   

用折叠线跟踪算法退除多卜勒速度折叠   总被引：1，自引：0，他引：1  

刘晓阳  张培昌 《南京气象学院学报》1992,15(4):493-499

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双线偏振雷达数字视频积分处理器     

王军  王致君 《高原气象》1990,9(4):449-451

在双线偏振雷达试制过程中,其视频积分处理器(DVIP)不同于常规雷达的DVIP。即将常规雷达峰值采样的DVIP改为具有距离、方位双重积分的多点采样智能化的DVIP,以减小脉动,提高被测对象的稳定性。本文介绍了双线偏振DVIP的组成方式、特点及工作原理。  相似文献   

用非相干散射雷达链的观测资料研究高、低纬电离层间的耦合          下载免费PDF全文

沈长寿  资民筠 《地球物理学报》1990,33(5):512-520

本文用美国NCAR非相干散射雷达链的观测资料进行了两个事例分析。结果表明,在所选事例的中、弱磁扰期间,高低纬电离层间以动力耦合效应为主,即扰动电离层发电机的特征较明显。由于赤道电离层特性和赤道站雷达观测灵敏度较高,从而也观测到与扰动电场从高纬直接穿透过来相关的电动耦合现象。最后,对有关的物理过程进行了讨论。  相似文献   

Riometer absorption events at SANAE,L=4.0     

P. H. Stoker 《Astrophysics and Space Science》1995,230(1-2):405-413

The absorption of cosmic radio noise passing through the ionosphere may be described as a function of radio wave frequencyA(f _e ) f _e ^-n , with n 2.0 for spatially uniform precipitation of electrons and n < 2.0 for spatially nonuniform precipitation. Using multifrequency riometer recordings at SANAE, the following observations are reviewed: (1) The frequency distribution of the power index, n, obtained from 4 min averaged absorptions during 1983, shows a most probable value around n 1.5, indicating that mostly energetic electrons are precipitated spatially structured onto the upper atmosphere, as in optical aurora. (2) Multifrequency riometer recordings suggest that field-aligned ionospheric irregularities have scattered additional cosmic radio waves from the central region of the Galaxy into the fields of views of the riometer antennae during an auroral absorption event in the early morning hours of 27 July, 1982. With the power reflectivity by ionospheric irregularities inversely proportional to the fourth power of radio wave frequency, as required by the Bragg condition, an estimated 70% increase in the 20 MHz radio flux at 01:22 UT, at the strong absorption peak, can explain the strongly reduced absorption observed in 20 MHz relative to 30 and 51.4 MHz. (3) Gradual increases in absorptions observed at all three riometer frequencies from onset at 11:50 UT of the largest solar proton ground level enhancement on 29 September, 1989, until 18:00 UT, suggest diffusion of the much more intense low energy protons from the polar cap to the L=4.0 geomagnetic field shell and subsequent precipitation at SANAE due to the South Atlantic Geomagnetic Anomaly. (4) The flux of electron energy deposited per second at SANAE is closely related to geomagnetic activity, but has a lower maximum during the years 1971 and 1980 of solar polar magnetic reversals than in the years 1976 and 1986/87 of minimum solar activity. (5) A significant correlation has been found between the arrival of single-hop whistlers and 30 MHz riometer absorption events, using point statistics. The maximum absorption at 30 MHz was 0.04 dB with a delay of 3 ± 2 s relative to the whistler.  相似文献