黄兴友,张磊,芦荀,李盈盈,印佳楠,马雷,张帅.C波段双线偏振雷达反射率因子的衰减订正及对降雨估测精度的改进.气象科学,2018,(2):237-246 HUANG Xingyou,ZHANG Lei,LU Xun,LI Yingying,YIN Jianan,MA Lei,ZHANG Shuai.Attenuation correction for C-band dual-polarization radar reflectivity factor and the accuracy improvement of precipitation estimation.Journal of the Meteorological Sciences,2018,(2):237-246
C波段双线偏振雷达反射率因子的衰减订正及对降雨估测精度的改进
Attenuation correction for C-band dual-polarization radar reflectivity factor and the accuracy improvement of precipitation estimation
投稿时间:2016-12-05  修订日期:2017-05-20
DOI:10.3969/2017jms.0047
中文关键词:  C波段双线偏振雷达  衰减订正  降雨估测
英文关键词:C-band linear dual-polarization radar  Attenuation correction  Rainfall estimation
基金项目:国家自然科学基金资助项目(41475034);国家重点基础研究发展计划(973计划)项目(2013CB430101)
作者单位E-mail
黄兴友 南京信息工程大学 气象灾害预报预警与评估协同创新中心, 南京 210044 hxyradar@126.com 
张磊 南京信息工程大学 气象灾害预报预警与评估协同创新中心, 南京 210044  
芦荀 南京信息工程大学 气象灾害预报预警与评估协同创新中心, 南京 210044  
李盈盈 南京信息工程大学 气象灾害预报预警与评估协同创新中心, 南京 210044  
印佳楠 南京信息工程大学 气象灾害预报预警与评估协同创新中心, 南京 210044  
马雷 南京信息工程大学 气象灾害预报预警与评估协同创新中心, 南京 210044  
张帅 南京信息工程大学 气象灾害预报预警与评估协同创新中心, 南京 210044  
摘要点击次数: 43
全文下载次数: 29
中文摘要:
      C波段双线偏振雷达反射率因子易受衰减的影响,为了提高降雨的准确性,需要对雷达反射率因子进行衰减订正。KDP是能够用于衰减订正的一个有效因子,本文采用小波分析法对ФDP数据进行预处理,再将处理后的数据拟合得到相对准确的KDP。为了验证衰减订正的效果,利用S波段雷达反射率因子作为参考,对比分析了衰减订正前后C波段双线偏振雷达反射率因子的变化,结果表明:经过衰减订正后的ZH更接近于S波段雷达的反射率因子。在进行降雨估测时,不同方案估测降雨的差异较大,当C波段双线偏振雷达与S波段雷达均采用Z-R关系估测降雨时,S波段雷达的效果更好。当C波段双线偏振雷达采用衰减订正后的RZHKDP)法估测降雨时,效果优于S波段雷达的RZ)方案。当降雨强度>10 mm·h-1时,雷达估测的雨量普遍低于地面雨量计的雨量,经过雨量计校准后,可以进一步提高降雨估测精度。
英文摘要:
      To estimate rainfall with C-band dual-polarization radar measurements, attenuation correction should be done on radar reflectivity factor because of its easy attenuation by hydrometeors along the path at C-band. Wavelet analysis is employed to preprocess ФDP for generating KDP based on data fitting result, and KDP is thereby used for attenuation correction. Validation of attenuation correction is executed by comparing pixel-to-pixel the reflectivity factor of a S-band radar with that of C-band radar before and after attenuation correction. The corrected C-band radar reflectivity factor is getting close to that of S-band radar. For rainfall estimation, different schemes lead to diverse results. Rainfall amount estimated from S-band radar is more reliable than that from C-band radar if corresponding Z-R relationships are used. But estimation from C-band radar by using R (ZH,KDP) relation with attenuation correction becomes better than that of S-band radar by using R (Z) equation. Gage-adjustment is necessary in case of rain-rate over 10 mm·h-1. After adjustment, the low-biased radar estimation is calibrated, and the gap between radar estimation and gage measurement goes down.
查看全文  查看/发表评论  下载PDF阅读器
关闭
function PdfOpen(url){ var win="toolbar=no,location=no,directories=no,status=yes,menubar=yes,scrollbars=yes,resizable=yes"; window.open(url,"",win); } function openWin(url,w,h){ var win="toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=" + w + ",height=" + h; controlWindow=window.open(url,"",win); } &et=510ACE8763C967D3E8D7CA4257F9CA6E2B3CDCB3570DA006035331D050B1893A8F039917DFF8CD03B3F16FD45761FC1C6AFE4AF9DF0C27F322EADC6FFF012F496C4EFDDF7C658DD3B7BBB6C49E41D3E144C55FBC93350F287FE44F943967731B8A8A8C8B151ADEC20AECB4823C65FD41F384D78D84F4890DB70BB9C8129AF96BF783C5A8E26469D8&pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=28A2F569B2458C17&jid=A26076E12D625EFF4F60DF07F22AE4EC&yid=EA357AD73C8E13BC&aid=&vid=&iid=0B39A22176CE99FB&sid=FE4C96E058BB2280&eid=28F9D9CF04F424FF&fileno=20180211&flag=1&is_more=0">