利用持续高分辨率观测对降水过程中不同对流单元的微物理研究

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers of Earth Science Pub Date : 2024-04-04 DOI:10.1007/s11707-022-1076-0
Ziheng Huang, Zheng Ruan, Debin Su
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引用次数: 0

摘要

云层中雨滴的生长和破裂过程会影响降雨强度和地表雨滴的大小。垂直指向雷达(VPR)获取的多普勒速度频谱包含大气湍流和降水流体大小分类的信息。本研究描述了中国南方降水量超过 700 毫米的降水事件中的四种对流小区(CC)类型。四种类型的 CC 的特征依次对应于孤立对流、组织对流的早期阶段、成熟阶段和衰退阶段。利用 C 波段 VPR 多普勒速度频谱检索空气垂直运动(Vair)和云中雨滴演变的微观物理分析,揭示了降雨在动态影响下的生长和破裂过程。较大的雨滴出现在早期阶段,并伴有冰粒,这些冰粒受到下落路径的下沉气流的影响。雨滴的聚集主要与上升气流和下降气流的交替有关,这也是成熟阶段地表降雨效率高的原因。下降阶段的 CC 源自水汽充足条件下弱而宽的下沉气流中的浅上升。上升气流在孤立对流阶段占主导地位。对流单元的观测结果可以更准确地反映在模式评估中。
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A microphysical investigation of different convective cells during the precipitation event with sustained high-resolution observations

The growth and breakup processes of raindrops within a cloud influence the rain intensity and the sizes of raindrops on the surface. The Doppler velocity spectrum acquired by a vertically pointing radar (VPR) contains information on atmospheric turbulence and the size classification of falling hydrometeors. In this study, the four types of Convective Cells (CC) during precipitation events with more than 700 mm of precipitation in southern China are described. The characteristics of four types of CCs correspond to the isolated convection, the early stage, the mature stage, and the decline stage of organizational convection, in that order. Microphysical analysis using retrieval of vertical air motion (Vair) and raindrop evolution in clouds from Doppler velocity spectra collected by C-band VPR revealed the growth and breakup of falling raindrops with dynamic impact. Larger raindrops appear in the early stages and are accompanied by ice particles, which are impacted by the falling path’s downdraft. Raindrop aggregation, which is primarily related to the alternation of updraft and downdraft, accounts for the mature stage’s high efficiency of surface rainfall. The CCs in the decline stage originate from the shallow uplift in the weak and broad downdraft under conditions of enough water vapor. The updraft dominates the stage of isolated convection. Observations of convective cells could be more accurately represented in model evaluations.

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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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