Plateau Meteorology

Plateau Meteorology >

2019 , Vol. 38 >Issue 3: 625 - 635

DOI: https://doi.org/10.7522/j.issn.1000-0534.2019.00012

Contrast Experiment of Different Coordinate Remapping Schemes in Radar Velocity Data Assimilation

  • MU Xiyu ,
  • XU Qi ,
  • PAN Yujie ,
  • SUN Shiwei ,
  • LI Xin ,
  • HUANG Anning
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  • Key Laboratory of Transportation Meteorology, China Meteorological Administration, Nanjing 210009, Jiangsu, China;Jiangsu Institute of Meteorological Sciences, Nanjing 210009, Jiangsu, China;Jiangsu Air Traffic Management Branch Bureau of Civil Aviation Administration of China, Nanjing 210000, Jiangsu, China;School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China;School of Atmospheric Sciences, Nanjing University, Nanjing 210093, Jiangsu, China

Received date: 2018-10-09

  Online published: 2019-06-28

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Abstract

Two interpolation schemes of radial velocity data in radar data assimilation are compared and analyzed through the high-precision numerical analysis and forecasting system jointly developed by Jiangsu Meteorological Bureau and Center for Analysis and Prediction of Storms. In Grid-scheme, the radar radial velocity data is interpolated from the polar coordinates to the three-dimensional model Grid by least squares method. In Tilt-scheme, the radar radial velocity data is only interpolated to the horizontal Grid through the bilinear interpolation in the horizontal direction but is not interpolated in the vertical direction, retained in the radial coordinates of the radar. In both schemes, radar reflectivity data is interpolated into the three-dimensional model Grid. The Grid-scheme results in smoothing of low-level data, and the Tilt-scheme retains more characteristics of radar observations. In this paper, the assimilation results of the two schemes are compared and analyzed through the cases of tornado, gust and heavy rain in Meiyu front. In the tornado case, the Grid-scheme obtained a part of larger assimilation wind field, while the Tilt-scheme result clearly showed the echo of tornado and the fine structure of the vortex. In the gust case, the maximum wind speed difference obtained by the two schemes is 3 m·s-1. The Tilt-scheme result was closer to the maximum wind speed observation and the distribution of the assimilated high wind speed region is more in line with the observation. In the Meiyu case, the Grid-scheme failed to reflect the high wind speed regions in the northeast and southwest regions. The horizontal high wind speed region obtained by the Tilt-scheme was obviously better than the Grid-scheme. At the lower altitude near the radar, the observations are dense, and the Tilt-scheme is better able to reflect the real atmospheric state. However, because of the lack of other observations for verification, the effects of the two schemes need to be compared by using numerical prediction or other methods.

Key words： Radar data assimilat; radial velocity; remapping scheme; tornado; gust; heavy rain

Cite this article

MU Xiyu , XU Qi , PAN Yujie , SUN Shiwei , LI Xin , HUANG Anning . Contrast Experiment of Different Coordinate Remapping Schemes in Radar Velocity Data Assimilation[J]. Plateau Meteorology, 2019 , 38(3) : 625 -635 . DOI: 10.7522/j.issn.1000-0534.2019.00012

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