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气象:2023,49(9):1075-1084
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不同类型强降水风暴低层双偏振参量对比分析
李芳,刁秀广
(山东省气象防灾减灾重点实验室,济南 250031; 山东省济宁市气象局,济宁 272000; 山东省气象台,济南 250031)
Comparative Analysis of Low-Level Dual Polarization Parameters of Different Types of Severe Rainfall Storm
LI Fang,DIAO Xiuguang
(Key Laboratory for Meteorological Disaster Prevention and Mitigation of Shandong, Jinan 250031; Jining Meteorological Office of Shandong, Jining 272000; Shandong Meteorological Observatory, Jinan 250031)
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投稿时间:2022-08-26    修订日期:2023-07-25
中文摘要: 利用山东S波段双偏振多普勒天气雷达资料、探空资料和地面降水实况,根据环境背景特征将强降水风暴分为雷暴大风(同时伴有强降水或冰雹)为主型(简称“混合型”)和单纯强降水为主型(简称“降水为主型”),对两种类型风暴分别考虑三种分钟降水量级,在六种不同情况下对强降水风暴的低层双偏振参量特征进行对比分析。结果表明:随着分钟降水量级增大,两种类型强降水风暴低层反射率因子(ZH)和差分相移率(KDP)都随之增大,“降水为主型”风暴差分反射率(ZDR)和相关系数(CC)变化不明显,“混合型”风暴ZDR和CC减小,说明随着降水量级增大,“混合型”强降水风暴低层尺寸更大的冰雹数量增多,导致ZDR和CC减小;对于2 mm·min-1以上高强度降水,“混合型”风暴低层ZH、ZDR、KDP分别集中在50.5~57.0 dBz、1.7~2.7 dB、2.4~4.3°·km-1,CC在0.960以上,而“降水为主型”风暴低层ZH、ZDR、KDP分别集中在49.5~53.5 dBz、1.2~2.1 dB、2.5~3.9°·km-1,CC在0.970以上,说明高强度降水时多数“混合型”风暴含有大量5~10 mm左右的较小冰雹,这些较小冰雹在低层融化为大雨滴使ZDR值增大,同时也使回波强度ZH高于“降水为主型”;相同分钟降水量级情况下,“混合型”风暴低层ZH和ZDR大于“降水为主型”,CC小于“降水为主型”,因为前者内部不仅存在较多5~10 mm较小冰雹,还存在一些大的冰雹粒子;风暴低层较大的KDP对两种类型强降水均有明显的指示意义。
Abstract:Based on the Shandong S-band dual polarization Doppler weather radar data, sounding data and surface precipitation observation as well as the environmental background features, severe rainstorms are divided into the thunderstorm gale (accompanied by severe precipitation or hail) dominated type (referred to as “mixed type”) and the simple severe precipitation dominated type (referred to as “precipitation dominated type”). Three types of minute precipitation magnitudes are considered for each type of rainstorm, and comparative analysis of the low-level dual polarization parameter characteristics of severe rainstorms in the six different scenarios is conducted in this paper. The results show that as the magnitude of minute precipitation increases, the low-level reflectivity factor (ZH) and specific differential phase (KDP) of both types of severe rainstorms increase. The differential reflectivity (ZDR) and correlation coefflicient (CC) of “precipitation dominated type” rainstorms do not show significant changes, while the ZDR and CC of “mixed type” storms decrease. This indicates that with the increase in magnitude of precipitation, the number of large-size hails in the lower layers of “mixed type” severe rainstorms increases, resulting in the decrease in ZDR and CC. For high-intensity precipitation above 2 mm·min-1, the low-level ZH, ZDR, and KDP of “mixed type” rainstorm are concentrated at 50.5-57.0 dBz, 1.7-2.7 dB, 2.4-4.3°·km-1, and CC is above 0.960, while the low-level ZH, ZDR, and KDP of the “precipitation dominated type” rainstorm are concentrated at 49.5-53.5 dBz,〖JP〗 1.2-2.1 dB, 2.5-3.9°·km-1 with CC above 0.970. This means that most “mixed type” rainstorms contain a large amount of small-size hails around 5-10 mm during high-intensity precipitation. These smaller hailstones tend to melt into larger rain droplets in the lower layers, increasing the ZDR value and also making the echo intensity ZH higher than that of the “precipitation dominated type”. At the same minute precipitation level, the low-level ZH and ZDR of the “mixed type” rainstorm are greater than those of the “precipitation dominated type” storm, and CC is smaller than that of the “precipitation dominated type” storm. This is because the former owns not only more 5-10 mm smaller hailstone but also some large hail particles. The larger KDP in the lower layer of rainstorms has obvious indicative significance for the two types of severe precipitation.
文章编号:     中图分类号:P407,P416    文献标志码:
基金项目:山东省自然科学基金项目(ZR2020MD053、ZR2022MD035、ZR2022MD088、ZR2022MD072)、山东省气象局科研项目(2021sdqxz09、2019sdqxz01、2019sdqxm19)共同资助
引用文本:
李芳,刁秀广,2023.不同类型强降水风暴低层双偏振参量对比分析[J].气象,49(9):1075-1084.
LI Fang,DIAO Xiuguang,2023.Comparative Analysis of Low-Level Dual Polarization Parameters of Different Types of Severe Rainfall Storm[J].Meteor Mon,49(9):1075-1084.