台风 "麦莎克"(2020 年)外围雨带观测到的自上而下现象:云和降水微物理与中国东北典型降水事件对比分析的启示

IF 2.8 3区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Tianao Liu, Yilun Chen, Haosheng Zuo, A. Zhang, Xiao Pan, Shumin Chen, Weibiao Li
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引用次数: 0

摘要

与中国东北地区的典型降水相比,向东北地区移动的热带气旋(TC)中的云和降水微物理可能会表现出明显的差异。本研究利用中国辽宁省的地面粒径速度(Parsivel)测距仪观测数据和地球静止轨道卫星 "向日葵 "的云属性数据,分析了台风 "麦莎克"(2020 年)外围雨带的雨滴粒径分布(DSD)特征和云垂直演变。与中国东北地区由冷涡(冷核低)诱发的典型降水事件进行了对比分析。我们的研究结果表明,与中国东北地区典型的冷涡诱发的降水事件相比,热带风暴诱发的降水事件中,中型雨滴占主导地位,直径较小,但浓度较高。对流降水介于海洋性降水和大陆性降水之间,更倾向于大陆性对流。这与中国东南部的热带气旋有明显差异,但与沿海前缘雨带中观测到的情况相似,表明受到了外热带的影响。对云滴垂直剖面的详细分析显示,在TC的外热带过渡过程中,出现了一种独特的 "自上而下 "现象,即低层云的发展紧随高层云的发展,这与之前的研究和对比案例不一致。进一步的研究表明,高层干冷空气的侵入和低层高湿度的存在对这一现象起着重要的推动作用。我们的研究结果将为中纬度地区与热带气旋相关的云和降水微物理学提供新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Top-down phenomenon observed in the outer rainbands of Typhoon Maysak (2020): insights from the comparative analysis of cloud and precipitation microphysics with a typical precipitation event in Northeast China
Cloud and precipitation microphysics in tropical cyclones (TCs) moving towards Northeast China may exhibit significant distinctions compared with the typical precipitation of this region. In this study, observations from ground-based Particle Size Velocity (Parsivel) disdrometers in Liaoning Province, China, and cloud property data from the Himawari geostationary satellite, were utilized to analyze the raindrop size distribution (DSD) characteristics and cloud vertical evolution associated with the outer rainbands of Typhoon Maysak (2020). A comparative analysis was conducted with a typical precipitation event in Northeast China induced by a cold vortex (cold-core low). Our findings reveal distinctive DSD characteristics related to the TC, where medium-sized raindrops dominate, with a smaller diameter but higher concentration in the TC case compared to the typical cold-vortex-induced precipitation case in Northeast China. Convective precipitation falls between maritime-like and continental-like patterns, leaning more towards continental convection. This varies significantly with TCs in Southeast China, but is similar to that observed in coastal-front-like rainbands, suggesting extratropical influence. A detailed analysis of the vertical profile of cloud droplets shows a unique “top-down” phenomenon during the extratropical transition process of the TC, where the development of lower-level clouds follows that of upper-level clouds, inconsistent with previous studies and the case for comparison. Further investigation indicates the significant role of the intrusion of dry and cold air from upper levels and the presence of high humidity in low levels in driving this phenomenon. Our results will provide novel insights into cloud and precipitation microphysics associated with TCs in mid-latitude regions.
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来源期刊
Monthly Weather Review
Monthly Weather Review 地学-气象与大气科学
CiteScore
6.40
自引率
12.50%
发文量
186
审稿时长
3-6 weeks
期刊介绍: Monthly Weather Review (MWR) (ISSN: 0027-0644; eISSN: 1520-0493) publishes research relevant to the analysis and prediction of observed atmospheric circulations and physics, including technique development, data assimilation, model validation, and relevant case studies. This research includes numerical and data assimilation techniques that apply to the atmosphere and/or ocean environments. MWR also addresses phenomena having seasonal and subseasonal time scales.
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