摘要
利用江西省89个气象观测站1960—2008年49 a常规观测资料,采用统计分析和插值处理方法,对该时段江西共计103次冻雨过程的时空演变进行分析,揭示了鄱阳湖以南沿抚河流域至赣中一带冻雨频发的分布特征;另外,从冷暖气团、温度垂直分布特性以及地形影响等方面,对频发地带的成因进行了探讨。结果表明:在冻雨频发地带,暖湿气团沿对流层低层冷垫爬升形成逆温有利于冻雨天气形成,冷暖空气持续在26°—28°N地区交汇,是该区域冻雨频发原因之一;符合逆温条件的冻雨高频区主要位于28°N以南,其中26°—27°N附近逆温次数明显高于其他地区;江西独特的地形是冻雨次数分布中间多、南北少的另一关键原因,对应江西喇叭口地形区域,最低气温和平均气温都较其他地区要低,更有利于冻雨出现。
The conventional surface and upper data from 89 weather stations in Jiangxi from 1960 to 2008 were used to reveal the distribution characteristics of frequent freezing rain zone from the Fuhe River basin in south of the Poyang Lake to the middle part of Jiangxi province by analyzing the time-space revolution of 103 freezing rain cases with statistical analysis and interpolation methods.In addition,the cause for frequent freezing rain zone was discussed on characteristics of cold and warm air mass,vertical distribution of temperature and topographic influence.The results show that warm and wet air mass ascending along the cold air cushion in the low level of troposphere originated inversion layer which is favorable to the formation of freezing rain event,and cold and warm air converging continuously over the areas from 26° to 27°N is one of the causes for frequent occurrence of freezing rain event.The frequent occurrence areas of freezing rain event according with inversion conditions mainly locate in the area to the south of 28°N,whereas the inversion frequency in the area from 26° to 27°N is significantly higher than that in other areas.Special topography is another important reason for the more freezing rain in the middle of Jiangx but a few in the north and south of Jiangx,and freezing rain in the topography areas with bellmouthing shape occurs frequently because the lowest and mean temperatures in these areas are lower than that in other areas.
出处
《暴雨灾害》
2011年第1期6-10,共5页
Torrential Rain and Disasters
基金
中国气象局气象新技术推广项目(CMATG2009MS03)
江西省气象局重点科研项目"江西冻雨
大雪
冰冻预报方法研究"
关键词
冻雨
气候特征
频发地带
地形
逆温
Freezing rain
Climatic characteristics
High Frequency freezing rain zone
Topography
Reversion
