0℃层高度的变化对冰雹融化影响的分析和应用  

Analysis and Application of the Effect of 0℃ Layer Height on Melting Hail

作　　者：濮文耀[1] 李红斌[1] 宋煜 黄振 何阳[1] 赵繁盛[1] 张殿刚[1] 

机构地区：[1]大连市人工影响天气办公室,大连116001 [2]大连市气象服务中心,大连116001 [3]大连市气象台,大连116001

出　　处：《气象》2015年第8期980-985,共6页Meteorological Monthly

基　　金：大连市科技局课题(2008E13SF188)资助

摘　　要：通过冰雹融化过程的热量平衡公式得到0℃层高度与冰雹融化能力的近似关系,分析小尺度冰雹条件下0℃层高度对0℃层冰雹半径和地面冰雹半径的影响。结果表明:地面冰雹半径随0℃层冰雹半径和0℃层高度变化,设定冰雹云判别的雷达回波高度和中心强度等指标时应考虑0℃层高度变化的影响;0℃层高度在2000~6000 m范围内时,0℃层冰雹最小半径临界值在0.32~1.08 cm,临界降雹的最小上升气流速度在11.5~21.2 m·s^(-1);结果分析可初步了解0℃层高度对冰雹融化的影响,为冰雹预报及人工防雹作业提供重要参考依据,降低通过WSR-88D增强HDA算法做冰雹尺寸预报的虚警率。Using thermal balance equation during the process of hail melting,the approximate relationship of 0℃ layer height（h0） and hail melting ability was obtained,and the influence of h0 to zero layer hail radius（r0） and ground hail radius（rg） was analyzed under the condition of small scale hail.The results show that rg changes with h0 and r0,so the hail cloud index setting such as radar echo height and center intensity is related to the change of h0,when h0 changes in the range of 2000 — 6000 m,the threshold of minimum zero layer hail radius changes between 0.32 cm to 1.08 cm,and the threshold of minimum updraft velocity changes from 11.5m·s^-1 to 21.2m·s^-1.The results show a general understanding on the change of 0℃ layer height to hail melting,which can provide a reference for hail forecast and hail-suppression operation,and reduce the false alarm rate of WSR-88 D enhanced HDA algorithm in hail size predication.

关 键 词：0℃层高度 0℃层冰雹半径 地面冰雹半径 雷达增强HDA算法 

分 类 号：P412[天文地球—大气科学及气象学] P482