气象科学2017，Vol.37Issue(5)：673-682,10.DOI:10.3969/2017jms.0002
一次伴有雷暴大风的飑线天气过程分析及数值模拟研究
Numerical simulation analysis on a squall line process accompanied with thunderstorm gale
摘要
Abstract
By using the 1°×1°NCEP/NCAR reanalysis data of 6 hours and mesoscale Weather Research and Forecasting (WRF) model,a strong squall line process in the Yangtze-Huaihe River Basin during 30 to 31 July,2014 was synoptically analyzed and numerically simulated.Results indicate that the squall line case occurred under the background that the mid-level stepped trough guided dry-cold air from the high-level superimposed on the low-level warm air,and the atmospheric instability enhanced and the unstable energy accumulated;the low level shear line prompted unstable energy release,which was an important triggering mechanism for the squall line.At the mature stage,the air maximum sinking velocity in high (low) layer has a good corresponding relationship with the graupel (rain) mixing ratio,and the hydrometeors' drag effect is the key to the formation of downdraft.Rainwater evaporation rate influences the strength and range of cold pool during the squall line maintenance period.The greater the evaporation rate of rainwater is,the stronger and wider the cold pool will be.The contrary is also true,or cold pool even disappears.Rainwater evaporation rate and surface wind velocity winds have a good positive correlation.The increasing rain evaporation rate can increase the wind speed on the ground,and the simulated maximum wind speed on the ground is also closer to the reality.关键词
飑线/雷暴大风/数值模拟/雨水蒸发率Key words
Squll line/Thunderstorm gale/Numerical simulation/Rainwater evaporation分类
天文与地球科学引用本文复制引用
崔强,王春明,张云,黄泓,岳甫璐..一次伴有雷暴大风的飑线天气过程分析及数值模拟研究[J].气象科学,2017,37(5):673-682,10.基金项目
国家自然科学基金资助项目(41275128) （41275128）
