| 冷平流强迫背景下攀枝花市一次雷暴过程综合分析 |
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| 引用本文： | 李典南,刘春艳,陈婷.冷平流强迫背景下攀枝花市一次雷暴过程综合分析[J].高原山地气象研究,2022,42(2):113-119. |
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| 作者姓名： | 李典南 刘春艳 陈婷 |
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| 作者单位： | 1.贵州省气象台，贵阳 550002 |
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| 基金项目： | 国家自然科学基金项目（41965010） |
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| 摘 要： | 基于欧洲中心ERA5再分析资料、NCEP再分析资料、卫星和雷达资料以及MICAPS气象资料，运用天气学方法对2020年4月13日四川省攀枝花市发生的冷平流强迫类雷暴天气过程进行综合分析。结果表明:本次雷暴过程混合了冰雹、短时强降水、雷暴大风等多种天气，其主要影响系统为200 hPa高空急流、500 hPa高原槽、700 hPa切变线和西南急流以及地面辐合线。200~500 hPa西北干冷空气顺高原槽南下对本次过程起主导作用，弱的700 hPa西南急流为本地输送了水汽和不稳定能量，中低层切变线和地面辐合线促进了暖湿气流的辐合抬升。此外，“上冷下暖”的气层结构、中低层较强的垂直风切变、气流的低层辐合与高层辐散、适宜的0℃和-20℃层高度、较强的CAPE和K指数、较大的700~500 hPa温度垂直递减率等因素也是本次雷暴天气过程发生发展的关键。
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| 关 键 词： | 攀枝花市 雷暴 冷平流强迫 冰雹 |
| 收稿时间： | 2021-08-31 |
Comprehensive Analysis of A Cold Advection Forcing Thunderstorm Process in Panzhihua |
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| Affiliation: | 1.Guizhou Provincial Meteorological Observatory, Guiyang 550002, China2.Panzhihua Meteorological Observatory, Panzhihua 617000, China3.Sichuan Provincial Meteorological Observatory, Chengdu 610071, China |
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| Abstract: | Based on the ERA5 reanalysis data of European Centre for Medium-Range Weather Forecasts (ECMWF), the NCEP reanalysis data, the satellite and radar data of Panzhihua, and the MICAPS routine meteorological data, the synoptic method was used to comprehensively analyze the cold advection forcing thunderstorm weather process in Panzhihua, Sichuan provinc on April 13, 2020. This thunderstorm process was a mixture of hail, short-term heavy rainfall and thunderstorm strong wind, and its main influence systems included the upper-level jet at 200 hPa, the plateau trough at 500 hPa, the shear line and the southwest jet at 700 hPa, and ground convergence line. The northwest dry and cold air at 200~500 hPa travelled southward along the plateau trough to play a leading role in this process. The weak southwest jet at 700 hPa transported a certain amount of water vapor and unstable energy to the local area, and the middle and low-level shear lines and the ground convergence line promoted the convergence and uplift of the warm and humid airflow. In addition, atmospheric structure of “upper cold and lower warm”, the strong vertical wind shear in the middle and lower layers, the convergence of the low-level and divergence of the upper-level, appropriate 0 °C and ?20 °C layer heights, the strong CAPE and K index, and the large vertical temperature decline rate between 700 hPa and 500 hPa were all key factors for the occurrence and development of this thunderstorm weather process. |
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