偶极子型热源和地形共同强迫下局域流型的演变特征  

EVOLUTIONAL CHARACTERISTICS OF LOCAL FLOW PATTERNS FORCED BY A COMBINATION OF BOTH DIPOLE FORM THERMAL FORCING AND TOPOGRAPHY

作　　者：罗哲贤[1] 马镜娴[1] 谢金南[2] 

机构地区：[1]南京气象学院,南京210044 [2]甘肃省气象局,兰州730020

出　　处：《气象学报》2000年第3期354-361,共8页Acta Meteorologica Sinica

基　　金：国家自然科学基金!49575259

摘　　要：用带有热源强迫和地形强迫的准地转正压模式，实施了6组时间积分为72个模式日的数值积分。结果指出：不同的初始状态，会产生不同的渐近行为，包括准平衡态、阻尼振荡和非阻尼振荡，显示出明显的非线性特征。热源强迫场空间结构的复杂程度，对系统时间演变特征也有重要影响。The quasigeostrophic barotropic vorticity equation with thermal and topographic terms is used to study temporal evolutions of local flow patterns. Six experiments whose integration times are 72 model days are performed. Results show that various initial fields can creat various approaching behavious such as quasiequilibria,damping oscilla-tions and no-damping oscillations,exhibiting obvious nonlinearity,and that the complex-ity of the space structure of the thermal forcing plays an important role for the evolution of the local flow patterns.

关 键 词：热源强迫 地形 局域流型 非周期演变 气旋 

分 类 号：P444[天文地球—大气科学及气象学]