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当前位置: 首页 > 文章 > 2020年孝感市一次春季极端强降水气象因子异常度分析 湖北农业科学 2021 (S1) 101-105
Position: Home > Articles > Analysis of abnormal degree of meteorological factors of an extreme heavy rainfall in the spring of 2020 in Xiaogan city Hubei Agricultural Sciences 2021 (S1) 101-105

2020年孝感市一次春季极端强降水气象因子异常度分析

作  者：
罗金芳;杨宏谦;周然;邓凯;张慧娟;姜敏
单  位：
孝感市气象局
关键词：
极端强降水;物理量;异常度;中位数
摘  要：
利用1960—2019年NECP/NCAR 2.5°×2.5°再分析资料、国家自动气象站降水监测,采用历史同期标准化距平法,对孝感市2020年3月26日一次极端强降水大气环流和物理量异常度进行分析。结果表明,此次过程位势高度、海平面气压、南风分量、露点、比湿、水汽通量散度、整层可降水量,散度、垂直速度、K指数等物理量异常度绝对值在4～12,可以作为孝感市3月极端强降水预报指标。过程发生前,贝加尔湖冷高压、副热带高压及东部洋面高压均异常偏强,三强系统配置下,孝感市低空急流发展旺盛,维持时间长。地面处于异常偏低的暖低压中,水汽和能量集聚,是孝感市3月强降水的共性特征。强降水发生前850 hPa南风分量异常偏大,且中低层大气一致偏暖,850 hPa温度达12℃;水汽条件异常丰富,大气整层可降水量异常度为5,925 hPa水汽辐合异常度高达-12。925 hPa存在异常强辐合,高层200 hPa配合强辐散,大气整层为强上升运动,850 hPa上升运动最强;K指数达30℃,相较于10℃的气候值异常度为4。
译  名：
Analysis of abnormal degree of meteorological factors of an extreme heavy rainfall in the spring of 2020 in Xiaogan city
作  者：
LUO Jin-fang;YANG Hong-qian;ZHOU Ran;DENG Kai;ZHANG Hui-juan;JIANG Min;Xiaogan Meteorological Bureau;
关键词：
extremely heavy rainfall;;physical quantity;;abnormal degree;;median
摘  要：
Using NECP/NCAR 2.5°×2.5° reanalysis data from 1960 to 2019 and the precipitation of the national automatic weather station,the anomalous degree of atmospheric circulation and physical quantity of an extreme heavy precipitation on March 26,2020 in Xiaogan city was analyzed by using the historical synchronous standardized anomaly method. The results showed that the geopotential height and sea-level pressure of this process were very high,south wind component,dew point,specific humidity,water vapor flux divergence,whole layer precipitable water,divergence,vertical velocity. The absolute value of K index and other physical quantity abnormal degree was between 4 and 12,which can be used as the forecast index of extreme heavy rainfall in March in Xiaogan city. Before the occurrence of the process,the Lake Baikal cold high,the subtropical high and the eastern ocean high were abnormally strong.Under the configuration of the three strong systems,the low-level jet developed vigorously and maintains for a long time. The surface was in the abnormally warm low pressure,and the water vapor and energy gather,which was the common characteristics of the heavy rainfall in March in Xiaogan city. Before the occurrence of heavy rainfall,the south wind component at 850 hPa was abnormally large,and the middle and lower atmosphere was uniformly warm,and the temperature at 850 hPa reached 12 ℃；The water vapor condition was very rich,the anomaly degree of precipitable water was 5,and the abnormal degree of water vapor convergence was-12 at 925 hPa. There was a strong convergence at 925 hPa,strong divergence at 200 hPa,the strong upward motion was at 850 hPa;The K index was 30 ℃,and the anomalous degree was 4 when compared with 10 ℃.

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