双月刊

ISSN 1006-9895

CN 11-1768/O4

X波段双偏振雷达物理量时间-高度剖面的重构方法改进及应用研究
DOI:
作者:
作者单位:

1.中国科学院大气物理研究所云降水物理与强风暴重点试验室LACS;2.青海省人工影响天气办公室

作者简介:

通讯作者:

基金项目:


Improvement and Application of Time-height Profile Reconstruction Method with X-band Dual Polarization Radar Parameters
Author:
Affiliation:

1.Key Laboratory of Cloud-Precipitation Physics and Severe Storms LACS,Institute of Atmospheric Physics,Chinese Academy of Sciences;2.Office of Weather Modification in Qinghai Province

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    如何利用现有雷达体扫数据重构反射率或其它物理量的时间-高度剖面,提高雷达体扫垂直分辨率并使其适用于云微物理结构的分析,是近几年来雷达气象学的重点研究内容之一。本文基于分辨率更高的X波段双偏振雷达体扫数据,对目前最新的Columnar Vertical Profile (CVP) 重构算法从目标区范围的选取方面进行改进,使其能够应用于水平尺度较小的局地降水云以及发展演变迅速的对流云。结果显示:对于高原地区局地降水云个例,目标区选取5km (径向范围)×10°(方位角范围) 组成的较小扇形区域,与云雷达的对比显示,改进的CVP方法重构的基本反射率(ZH)垂直廓线体现了回波的垂直结构,尤其是中高层对流泡的结构特点,相应的时间-高度序列能够较好地反映回波顶高的变化以及中高层强度逐渐减弱、低层强度逐渐增加的特点;对于华北地区发展旺盛且局地水平不均匀的对流云个例,本文改进了原始的CVP重构目标区选取方法,对高、低仰角层采用变化的径向范围并调整插值参数,改进后重构的ZH垂直廓线有效避免了低层回波水平分布相对不均匀导致的重构分层结构,显示出高、低层回波特征以及不同阶段目标区云结构的转变。进一步对比改进前后CVP方法重构建立的各偏振量时间-高度序列,改进后准确显示了个例云系微物理特征及其随时间的变化,揭示了高原地区局地降水云中对流泡的形成及其播撒作用机制,华北地区对流云成熟阶段的各偏振量垂直分布特征及其演变。

    Abstract:

    How to reconstruct time-height profile of radar reflectivity and other parameters using Volume Coverage Pattern (VCP) data to improve its vertical resolution and make it suitable for cloud microphysical research is one of popular topics in radar meteorology in recent years. Based on the volume scan data of X-band dual polarization radar with high resolution, this paper improves the column vertical profile (CVP) algorithm by varying the selection of target area, so that it can be applied to rapidly developing convective clouds and locally generated cloud with small horizontal scale. The comparison with cloud radar shows that for the local precipitation in the plateau area, the basic reflectivity (ZH) vertical profile reconstructed by modified CVP with a small area composed of 5km (radial range)×10° (azimuth coverage) can reasonably reflect the characteristics of generating cells in the high level, the gradual decreasing of ZH from high layer as well as the gradual increasing of ZH toward low layer. For the vigorous developed convective cloud in North China, the area selection strategy of original CVP was improved by adopting the varying selected radial range for high and low elevation layers. New vertical profile of ZH significantly avoids the “zig-zag” structure caused by the relatively uneven horizontal distribution of the low-level echo, while it can still maintain main characteristics of the high-level echoes of convective cloud in the vigorous developing stage as well as the transformation of cloud structure at different stages. Furthermore, comparing reconstructed results of modified CVP and original CVP, new time-height series of different polarization parameters shows cloud microphysical characteristics changing over time accurately, revealing convection generating-cells mechanisms of formation and its seeding effect on plateau; Vertical distribution characteristics of polarization variables varing with time in mature stage of convective cloud in North China could also be displayed.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2022-03-29
  • 最后修改日期:2022-05-20
  • 录用日期:2022-06-14
  • 在线发布日期:
  • 出版日期: