太原CINRAD/CC雷达与X波段雷达观测一致性分析
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摘要
由于地球曲率和地形阻碍等原因造成太原CINRAD/CC雷达探测盲区较多,且远距离处波束展宽导致分辨率降低,因此安装在太原雷达扫描范围内的X波段雷达能够对CINRAD/CC的探测盲区进行补充,但在应用之前,需对二者的观测一致性进行分析。首先确定两型号雷达的有效共同探测区域,然后以太谷X波段雷达为例,对比分析共同探测区域内两部雷达在同时刻反射率因子的观测结果。结果表明:无遮挡时反射率因子在两部雷达上出现的位置和变化趋势基本一致;两部雷达所在位置连线的垂直剖面上回波强中心的位置一致,且X波段雷达的垂直剖面更清晰,强中心更突出;由于X波段雷达为全固态雷达,在20 km内外采用了不同的脉冲模式,导致距太谷雷达20 km内的值与太原雷达存在明显差异,距太谷雷达20 km外的区域相差不大,该差异可以通过系统定标加以订正。
Due to the curvature of the earth and terrain obstructing,there are many blind area for CINRAD/CC radar detection in Taiyuan,and the resolution is reduced at long distance due to the spread of the beam. X-band radar,which is installed in the range radar scanning in Taiyuan,can supplement the detection blind area of CINRAD/CC. But before application,it is necessary to analyze the observation consistency of the two radars. In this paper,the effective common detection area of the two radar is determined firstly,and then the Taigu X-band radar is taken as an example to compare and analyze the observation results of the reflectivity in the common detection area. The results show that: the position and change trend of the reflectivity factor is basically the same; the position of the echo strong center on the vertical section of common detection area is consistent,and the vertical section of the X-band radar is clearer and the strong center is more prominent; because X-band radar is all solid state radar,different pulse modes are adopted in and out the range of20 km,so there is a significant difference between the reflectivity of these two radars in the range of Taigu radar 20 km,and the difference from the area outside 20 km of the Taigu radar is small,the difference can be corrected by the system calibration.
Due to the curvature of the earth and terrain obstructing,there are many blind area for CINRAD/CC radar detection in Taiyuan,and the resolution is reduced at long distance due to the spread of the beam. X-band radar,which is installed in the range radar scanning in Taiyuan,can supplement the detection blind area of CINRAD/CC. But before application,it is necessary to analyze the observation consistency of the two radars. In this paper,the effective common detection area of the two radar is determined firstly,and then the Taigu X-band radar is taken as an example to compare and analyze the observation results of the reflectivity in the common detection area. The results show that: the position and change trend of the reflectivity factor is basically the same; the position of the echo strong center on the vertical section of common detection area is consistent,and the vertical section of the X-band radar is clearer and the strong center is more prominent; because X-band radar is all solid state radar,different pulse modes are adopted in and out the range of20 km,so there is a significant difference between the reflectivity of these two radars in the range of Taigu radar 20 km,and the difference from the area outside 20 km of the Taigu radar is small,the difference can be corrected by the system calibration.
引文
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[2]史朝,何建新,李学华,等.X波段天气雷达地物回波的双偏振参量特征分析及应用[J].高原气象,2013,32(5):1478-1484.
[3]Mc Laughlin D,Pepyne D,Philips B,et al.ShortWavelength Technology and the Potential For Distributed Networks of Small Radar Systems[J].Bull.Am.Meteorol.Soc.2009,90:1797-1817.
[4]Chandrasekar V,Chen H,Philips B.Principles of High-Resolution Radar Network for Hazard Mitigationand Disaster Management in an Urban Environment[J].J.Meteorol.Soc.Jpn,2018.
[5]Chandrasekar V,Wang Y,Chen H.The CASA quantitative precipitation estimation system:A five yearvalidation study[J].Nat.Hazards Earth Syst.Sci,2012,12:2811-2820.
[6]Junyenet F,Chandrasekar V,Mclaughlin D,et al.The CASA integrated Project 1 networked system[J].J Atmos.Ocean Technol.,2010,27(1):61-78.
[7]愈小鼎,姚秀萍,熊廷南.多普勒天气雷达原理与业务应用[M].北京:气象出版社,2009.
[8]Snook N,Xue M,Jung Y.Ensemble probabilistic forecasts of a tomadic mesoscale convective system from ensemble Kalman filter analyses using WSR-88D and CASA radar data[J].Mon wea Rev,2012,140(7):2126-2146.
[9]Kim D-S,Maki M.Validation of composite polarimetric parameters and rainfall rates from an X-band dual-polarization radar network in the Tokyo metropolitan area[J].Hydrol.Res.Lett,2012(6):76-81.
[10]Zhao Shi,Haonan Chen,Venkatachalam Chandrasekar,et al.Atmosphere Deployment and Performance of an X-band Dual-polarization Radar during the Southern China Monsoon Rainfall Experiment[J].Atmosphere,2017,9(1):4.
[11]张培昌,王振会.天气雷达回波衰减订正算法的研究(I):理论分析[J].高原气象,2001,20(1):1-5.