双月刊

ISSN 1006-9895

CN 11-1768/O4

基于Ka波段云雷达观测的中国西天山降雨云宏微观物理特征研究
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中国气象局乌鲁木齐沙漠气象研究所

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国家重点研发计划,国家自然科学基金


Macro-micro Physical Characteristics of Rainfall Clouds in the West Tianshan Mountains Based on Ka Band Cloud Radar
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    摘要:

    利用Ka毫米波云雷达与自动气象站降雨资料,研究了西天山地区2019年和2020年5-8月的降雨云宏微观特性。结果表明:(1)降雨主要发生在夜间,累积降雨量集中在21:00至次日07:00,降雨频次和累积降雨量相关系数为0.71。大雨强频次虽最少,但对总累积降雨量贡献较显著;(2)小雨强、中雨强、大雨强平均反射率因子最大值分别为30 dBZ、35.8 dBZ和39.5 dBZ,最大平均液态水含量分别为1.5 g·m-3、4.2 g·m-3和7.3 g·m-3;(3)不同降雨强度对应的反射率因子都有两个集中区域,2.0~4.4 km反射率因子集中在15~26 dBZ,地面附近的小雨强、中雨强、大雨强对应的反射率因子分别集中在24~32 dBZ、29~38 dBZ和31~42 dBZ。1.75 km以下中雨强和大雨强液态含水量小于1 g·m-3的频率明显少于小雨强,降雨强度的越大降雨粒子径向速度越集中。

    Abstract:

    Based on Ka-band millimeter wave cloud radar and rainfall data from automatic weather stations, this study analyzed the physical characteristics of rainfall clouds in the West Tianshan Mountains, from May-August 2019 and 2020. The results show that: (1) Rainfall mainly occurs at night. The cumulative rainfall was concentrated from 21:00 to 07:00 the next day. There was a significant positive correlation between rainfall frequency and accumulated precipitation. The frequency of heavy rainfall was the least, but the contribution to the total accumulated rainfall was significant; (2) The maximum average reflectivity of light rainfall intensity, moderate rainfall intensity, and heavy rainfall intensity were 30 dBZ、35.8 dBZ, and 39.5 dBZ, and the maximum average liquid water content was 1.5 g·m-3、4.2 g·m-3、7.3 g·m-3;(3) There are two concentrated areas for the reflectivity of different rainfall intensities. The reflectivity of 2.0~4.4 km were concentrated in 15~26 dBZ, and the reflectivity of light rainfall intensity, moderate rainfall intensity and heavy rainfall intensity near the ground were respectively concentrated in 24 ~32 dBZ, 29~38 dBZ and 31~42 dBZ. The frequency of moderate rain intensity and heavy rain intensity below 1.75 km where the liquid water content is less than 1 g·m-3 is significantly less than that of light rain intensity. The greater the rainfall intensity, the more concentrated the radial velocity of rainfall particles.

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  • 收稿日期:2021-07-01
  • 最后修改日期:2021-12-30
  • 录用日期:2022-02-24
  • 在线发布日期: 2022-03-07
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