| 宁夏两次夏季典型暴雨过程成因对比分析 |
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| 引用本文： | 杨苑,高山,陈星宜,白春燕.宁夏两次夏季典型暴雨过程成因对比分析[J].现代农业科技,2024(13). |
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| 作者姓名： | 杨苑 高山 陈星宜 白春燕 |
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| 作者单位： | 中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室 宁夏银川 宁夏气象防灾减灾重点实验室 宁夏银川 宁夏中卫市气象局 宁夏中卫,中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室 宁夏银川 宁夏气象防灾减灾重点实验室 宁夏银川 宁夏中卫市气象局 宁夏中卫,中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室 宁夏银川 宁夏气象防灾减灾重点实验室 宁夏银川 宁夏中卫市气象局 宁夏中卫,中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室 宁夏银川 宁夏气象防灾减灾重点实验室 宁夏银川 宁夏中卫市气象局 宁夏中卫 |
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| 基金项目： | 中国气象局创新发展专项资助项目（CXFZ2021Z034） |
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| 摘 要： | 利用自动气象站站点实况和ECMWF ERA5的逐时再分析资料，通过环流分析和物理量诊断方法，对比2017年6月4日和2019年8月2日宁夏区域性暴雨强降水区域、环流背景、影响系统和物理量因子的共性和不同.结果表明:后者累积降水量和最大小时雨强均比前者大；2017年6月4日，宁夏处于东高西低的环流形势中，强降水出现在低空急流的左前方，低空切变线的右前方，即宁夏中北部，稳定维持的地面中尺度辐合线触发了局地强降水；2019年8月2日暴雨过程出现在宁夏南北两头，是两槽一脊环流背景下，由500hPa冷涡、冷槽和700hPa低槽、切变、低空急流共同造成的，是一次典型的强对流单体导致的暴雨过程.2019年8月2日短时强降水过程比湿、CAPE、ZH零度高度、-20度层高度数值较大；两次短时强降水过程沙氏指数为正；2017年6月4日LI为正值，2019年8月2日LI为负值；2017年6月4日850-500假相当位温差为负值，2019年8月2日为正值；二者200hpa 、700hPa为辐散，850hPa为辐合，后者200hPa辐散中心强度大于前者，而700hPa辐散中心强度和850hPa辐合中心强度反之。
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| 关 键 词： | 环流背景 影响系统 物理量 共性差异 |
| 收稿时间： | 2023/10/31 0:00:00 |
| 修稿时间： | 2023/10/31 0:00:00 |
Comparative analysis on the causes of two summer torrential rain processes in Ningxia |
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| Authors: | Gao Shan and |
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| Abstract: | using automatic weather station data and hourly reanalysis data of ECMWF ERA5, based on circulation analysis and physical diagnostic methods, the similarities and differences of heavy rainfall region, circulation background, influence system and physical factors between June 4,2017 and August 2,2019 in Ningxia were compared. The results show that the accumulated precipitation and the maximum hourly rainfall intensity of the latter are larger than those of the former. On June 4,2017, Ningxia was in the circulation situation of high east and low west, and the heavy precipitation appeared in the left front of the low level jet stream and the right front of the low-level shear line.That is in the middle and north of Ningxia. The stable surface mesoscale convergence line triggered the local heavy rainfall. The torrential rain on August 2,2019 occurred at both ends of Ningxia. It is a typical heavy rainfall process caused by strong convective cells, which is caused by a combination of 500hpa cold vortex, cold trough and 700hpa low trough, shear and low level jet.the humidity, CAPE, ZH zero-degree height and -20degree height on August 2,2019 was larger.Both of them showed positive SI.Li On June 4,2017 was positive, Li on August 2,2019 was negative.850-500 false equivalent temperature difference on June 4,2017 was negative, on August 2,2019 was positive; Both of them are divergence on 200hpa and 700hPa and convergence on 850hpa.The intensity of the latter 200hPa divergence center is greater than that of the former, while the intensity of the 700HPA divergence center and the 850hPa convergence center are opposite. |
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| Keywords: | circulation background influence system physical quantity similarities and differences |
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