摘要
利用常规天气资料、常规探空资料对山东地区2003-2012年共11次极端强降水过程的环境参数特征进行了分析,结果表明:500 h Pa以下含有丰富的水汽,地面、850 h Pa、700 h Pa和500 h Pa露点温度分别达到23、17、8和-7℃以上,温度露点差基本上在3℃以内;大气处于不稳定状态,K指数≥37℃,总指数TT≥41℃,抬升指数LI〈0℃;大气具有一定的能量积累,CAPE≥500 J/kg;0℃层高度都在5000 m以上;反射率因子高值区基本上处于6 km以下;低层有明显的西南急流。
The characteristics of environmental parameters of 11-time extremely heavy precipitation processes in Shandong from 2003 to 2012 were analyzed by using conventional weather data and routine sounding data.The results showed that:abundant water vapor existed below 500 hPa, the dew point temperature on the ground, 850 hPa, 700 hPa and 500 hPa reached over 23℃, 17℃, 8℃and -7℃respectively, and the difference value between temperature and dew point temperature was generally within 3 ℃. The atmosphere was in an unstable state, K-index was more than or equal to 37℃, total index TT was higher than or equal to 41℃, and lifting index LI was less than 0℃.The atmosphere accumulated a certain energy, and CAPE was more than or equal to 500 J/kg.The height of 0℃layer was above 5000 m.The high-reflectivity region was basically under 6 km.There was obvious southwest jet stream in lower layer.
出处
《江西农业学报》
CAS
2015年第6期113-117,124,共6页
Acta Agriculturae Jiangxi
基金
山东省气象局重点课题(2012sdqxz05)
关键词
山东
极端强降水
环境参数
特征
分析
Shandong
Extremely heavy precipitation
Environmental parameter
Characteristics
Analysis