Plateau Meteorology

Plateau Meteorology >

2017 , Vol. 36 >Issue 6: 1665 - 1673

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00137

A Study on the Consistency and Deviation Correction of the Radar Reflectivity Factor of Three Ground-based Radars in Southern Jiangsu

  • HAN Jing ,
  • CHU Zhigang ,
  • WANG Zhenhui ,
  • XU Fen ,
  • LI Nan ,
  • ZHU Yiqing ,
  • ZHANG Hanyun
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  • Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, China Meteorological Administration Key Laboratory for Aerosol-Cloud-Precipitation, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China;School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China;Jiangsu Institute of Meteorological Sciences, Nanjing 210009, Jiangsu, China

Received date: 2016-04-19

  Online published: 2017-12-28

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Abstract

With the development of sophisticated meteorological equipment, weather radar is becoming an effective tool for monitoring and providing early warning of severe weather, especially small-scale disaster weather events. China new generation of weather Radar can be used for quantitative precipitation estimation (QPE) in large area, but the inconsistency between the data of adjacent radars may affect the networking application, especially in terms of Multi-Radar precipitation evaluations, data assimilation, cloud and precipitation physics research. In this paper, Precipitation Radar (PR) data, collected by the tropical rainfall measuring mission (TRMM) satellite, was used as a unified reference to analyze the consistency of 7 matched events of the PR and three Ground-based Radars (GRs) in southern Jiangsu (Nanjing, Changzhou and Nantong) during the period from June to July, 2010. Through the following seven-steps pretreatment:(1) PR and GR data match-up, (2) GR data azimuth adjustment, (3) GR data terrain blocking analysis, (4) GR data radial distance selection, (5) GR data vertical height selection, (6) Ku-adjusted, (7) NUBF analysis, the available best comparable data were used to establish a revisions relationship, the error correction and analysis was carried out. The results show that:(1) the reflectivity of Nanjing radar was about 3.5 dB smaller than that of Changzhou radar, while the reflectivity of Changzhou radar is about 0.9 dB smaller than that of Nantong rador, 3 km height of echo intensity mosaics obvious discontinuity; (2) after deviation correction, the difference of reflectivity between Nanjing and Changzhou, Changzhou and Nantong were reduced to 0.3 and 0.2 respectively, mosaics effect was significantly improved. The method may be applied to improve the quality of precipitation data products from the GR network and their quantitative application for the southern region. It can also be used for the further development of spaceborne PR and GR network data analyses, and provide an important reference value for the accuracy of multi-radar joint precipitation estimates and the application of radar networking mosaics.

Key words： TRMM PR; Ground-based Radar (; consistency analysis; deviation correction

Cite this article

HAN Jing , CHU Zhigang , WANG Zhenhui , XU Fen , LI Nan , ZHU Yiqing , ZHANG Hanyun . A Study on the Consistency and Deviation Correction of the Radar Reflectivity Factor of Three Ground-based Radars in Southern Jiangsu[J]. Plateau Meteorology, 2017 , 36(6) : 1665 -1673 . DOI: 10.7522/j.issn.1000-0534.2016.00137

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