摘要
利用1951～2010年广西气温资料和NCEP/NCAR再分析资料,使用Morlet小波分析等方法,分析得到广西高温酷热天气有增高的变化趋势,具有12～14a和10a周期变化特征。2010年7～9月广西多次出现持续性大范围高温天气,多站次打破当地历史同期极端最高气温记录,主要成因为:副热带高压强度偏强、位置脊线偏西、广西受强盛的副热带高压控制。当热带气旋中心位于(20～24°N,116～121°E)区域时,通常广西刚好受到热带气旋下沉气流影响,下沉气流加热增温导致广西高温天气的发生。2010年夏季极涡面积偏小、位置长期偏向西半球,导致影响我国的冷空气偏弱,也广西高温天气发生的原因之一。
Based on the daily temperature data of Guangxi and the NCEP/NCAR reanalysis data during 1951-2010, the causes of maximum temperature in 2010 have been investigated by using Morlet wavelet analysis method. The results show that the maximum temperature exhibits a increasing tendency on a long-term basis and displays significant characteristics of periodic oscillations, all with stronger 12-14 and 10- yearly periods. The partial strong of subtropical high strength, shifted westward of ridge line position, and domination of the strong subtropical high press are all the main cause of maximum temperature in 2010. The center of typhoon at the field （20~24？N , 116-121？E） and the most parts of Guangxi are under the control of downward current. Furthermore, the small area size of polar vortex in 2010 summer was and the displacement of polar vortex towards Western Hemisphere lead to the weakening invasion of the cold airs, and this were also the cause of hot weather in Guangxi.
出处
《气象研究与应用》
2011年第4期13-16,共4页
Journal of Meteorological Research and Application
基金
广西科学基金资助项目(桂科青0991060)
关键词
广西
高温
副热带高压
台风
Guangxi
maximum temperature
subtropical anticyclone
typhoon
