摘要
应用有限区域波数-功率谱和滞后线性回归统计方法,对比分析1979—2004年热带气旋(TC)活动强、弱年亚洲-西太平洋区域(AWP)夏半年大气季节内振荡(ISO)的传播特征及海气相互作用过程。分析结果表明:在整个AWP和西太平洋区域都存在TC强年ISO东传特征更显著的特征,ISO对流传播在纬向上伸展更偏东,强年沿赤道东传20～60 d周期波动更强,西太平洋区域是传播特征强弱年区别较显著的区域,与TC活动密切联系;TC强、弱年ISO过程中海气相互作用过程相同,海洋和大气间的能量交换对维持ISO西北传播时起作用;TC强年的海气相互作用比弱年更加强烈,尤其是对流凝结潜热的释放在强年比弱年强,这可能是导致TC强、弱年ISO特征区别的原因之一。
Comparative analysis is carried out by using limited-area power spectrum and lagged regression statistical methods for the propagating characteristics and air-sea interaction processes of intraseasonal oscillations（ISOs） in the Asia to western Pacific（AWP） region in the boreal summer between the active and inactive tropical cyclone（TC） years from 1979 to 2004.The results show that：（1） there exist more significant eastward propagating characteristics of the ISO in the active TC years over the whole Asia to western Pacific region and the western Pacific region.The ISO of convection propagate zonally with more eastward extension in the years with active tropical cyclone activities,during which the 20～60 d period is strengthened,western Pacific becomes an area with evident characteristics of the propagation that is intimately related to TC activities;（2） the air-sea interaction processes are the same in both active and inactive TC years,and the energy exchanges between air and sea play a role in maintaining the northwestward propagation of ISOs.（3） The air-sea interaction is more intensive in the active TC years than in the inactive ones.It is particularly true for the latent heat release by condensation as the result of convection,which may be one of the reasons resulting in significant difference in characteristics of ISOs between the active and inactive TC years.
出处
《热带气象学报》
CSCD
北大核心
2011年第1期22-30,共9页
Journal of Tropical Meteorology
基金
国家重点基础研究发展计划(2009CB421505)
国家自然科学基金项目(40775058
40675055)
广西自然科学基金项目(2010GXNSFA013010)共同资助
关键词
气候动力学
季节内振荡(ISO)
有限区域波数-功率谱
滞后线性回归
热带气旋
climate dynamics
intraseasonal oscillation
finite-domain wavenumber-frequency energy spectrum
lagged linear regression
tropical cyclone
