摘要
利用NCEP/NCAR再分析资料,通过波包传播的诊断方法,对2008年1月我国南方地区大范围低温雨雪天气期间波包传播和积累进行了分析与研究。分析表明,中低层500hPa和700hPa高度场的波包传播特征能够较好地反映期间出现的4次低温雨雪天气过程。4次雨雪过程基本上产生于波包扰动能量积累的高值时段或处于低压系统持续稳定阶段,雨雪天气处于波包大值区控制下。波包值的经向和纬向传播特征表明2008年1月我国南方地区持续低温雨雪天气过程,主要受到青藏高原南缘系统异常活跃的影响,南支槽活动频繁有利于来自印度洋和孟加拉湾的暖湿气流沿云贵高原不断向我国输送,继而为我国长江中下游以及其南部地区低温雨雪天气提供了充足的水汽来源。偏北路径的冷空气,副高西南侧偏东气流的扰动能量的传播和积累,在波包传播图上都有一定的反映。该研究对进一步利用波包传播图预报天气过程提供了有意义的一种思路。
By using the NCEP/NCAR reanalysis data and the diagnosis analysis method of wave packet propagation （WPD）, wave packet propagation and accumulation during the extreme low temperature, heavy snowstorm and frost disasters occurred in South China were analyzed. Results show that the characteristic of wave packet propagation at 500 hPa and 700 hPa can better display four processes of rainstorm weather. Accumulated perturbation energy has been maintaining high value when these four processes occur. Frozen weather appears in the high value region of wave packet. The characteristic of wave packet propagation shows that the persistent processes of severe weathers with cold surge, ice-snow and frozen rain on January 2008 are influenced by the Indian and Burma trough active, it also favors to （IBT） in the south side of the Qinghai the moisture transportation to China -Xizang Plateau. Because it is quite along the Yunnan-Guizhou Plateau from the Indian Ocean and Bay of Bengal. Perturbation energies of cold air in the northward path and in the eastward side of western Pacific subtropical high （WPSTH） are certainly reflected on the wave-packet map. It indicates that the diagnosis analysis of wave packet propagation （WPD） is meaningful to predict the weather process.
出处
《气象》
CSCD
北大核心
2008年第12期11-20,共10页
Meteorological Monthly
基金
中国气象局高原大气研究所开放基金项目
四川省教育厅科研项目(2005C018)支持
关键词
波包传播诊断
低温雨雪天气
扰动能量
wave-packet propagation （WPD） severe cold surge ice-snow weather perturbation energy
