双月刊

ISSN 1006-9895

CN 11-1768/O4

结合Ka和X波段双偏振雷达对北京一次锋面降雪过程雪带的观测分析
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中国科学院大气物理研究所

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Observation and Analysis of Snowbands Structure in a Cyclone Frontal Snowfall at Beijing with a Ka-band and an X-band Polarized Radars
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Institute of Atmospheric Sciences, Chinese Academy of Sciences

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    摘要:

    本文设计了中国科学院大气物理研究所位于同一观测站内的一部单发双收Ka波段双偏振雷达和一部双发双收X波段双偏振雷达高效结合观测的方法,并首次将Ka和X波段双偏振雷达结合应用在降雪过程的观测中,对2019年2月14日锋面气旋系统在北京地区降雪过程中雪带的形成、发展、消亡过程的宏微观结构进行了分析。结果表明,雪带的垂直结构符合以往对层状云垂直分层的物理认识,类似但不同于雨带由凝结增长层、丛集层、淞附层、融化层组成的四层结构,雪带只包含由上层“播种”至下层的冰晶形成的凝结增长层、丛集层和淞附层三层。由于各层水平风速不同,雪带的三层结构并非垂直排列。多个雪带不断生成发展维持降雪,直至冰晶凝结生长层变空,云从冰晶凝结生长层分裂为多层云后各自消散。证明了Ka和X波段双偏振雷达结合的必要性和高效性,丰富了对锋面气旋系统雪带的认识,补充了Ka波段和X波段雷达对降雪的观测研究。

    Abstract:

    In this paper, a simultaneous observation method of a Ka-band polarized radar and an X-band polarized radar in the same station of Institute of Atmospheric Physics, Chinese Academy of Sciences are designed for the first time. The formation and development of snowbands during the snowfall process of a frontal cyclone system inBeijing on February 14, 2019 are observed by this method, and the lifecycle and vertical structure of snowbands are analyzed. Results show that structure of snowbands is similar but different from the four-layer structure composed of condensation layer, aggregation layer, riming layer and melting layer of rainbands. Snowbands only contains condensation layer, aggregation layer and riming layer formed from seeding of upper layer cloud to lower layer cloud. Multiple snowbands continuously generate and develop to maintain the snowfall. Horizontal wind speeds vary from layer to layer, so the three layers of a snowband may not be arranged vertically. Snowflakes are formed continuously in snowbands until condensation layer becomes empty, and the cloud splits from this layer into multi-layer clouds and then dissipates respectively. It is proved that the dual frequency polarized radar simultaneous observation is necessary and efficient. It complements the observation of snowfall by Ka-band and X-band radar, and enriches the understanding of snowbands of frontal cyclone system.

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  • 收稿日期:2020-01-08
  • 最后修改日期:2020-09-30
  • 录用日期:2020-12-23
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