摘要
发展了一个描述副热带高压脊面变化的动力模型。这一模型基于大气环流角动量的守恒原理 ,得到了作为东、西风交界面的副高脊面变化所满足的方程 ,由于副高脊面直接成为预报量 ,因此 ,该模型对这一特定的研究对象有明确的动力学意义 ,便于进行脊面变化的动力影响因素研究。进一步发展了模型的简化数值方案 ,在权重函数为常数的假设下进行了初步试验 ,结果显示 ,副高脊面形态的时空变化基本能够模拟出来 ,主要体现在脊面的进退和倾斜等特征 ,说明该模型具有一定的模拟能力 ,而且三维积分格式的采用使得模拟结果比较平稳 ,过滤掉了高频噪音。数值试验的结果表明 ,按照脊面动力模型 ,确实能够直接计算副高脊面变化 (移动和形变 ) ,并定量地考察影响脊面变化动力因子的贡献。
A dynamical model is developed to simulate the variation of subtropical high ridge-line section (SHRS). The model's basic equations, originated from the principle of angular momentum conservation, represent the movement of SHRS(the section of westerly and easterly of subtropics). In the equations, the SHRS is expressed explicitly as a predictand, which benefits to study the dynamical factors affecting SHRS directly. Further, a simplified numerical scheme of the SHRS-model is designed and the preliminary experiments of simulation are conducted on the assumption that the weight function is constant. The results show that the temporal and spatial variation of subtropical high shape is simulated basically well, especially in the features of SHRS’s slope and its advance and retreat, which indicate that the model has elemental capability of simulation and prediction of SHRS and redounds to investigating dynamical factors affecting variation of SHRS quantificationally.
出处
《大气科学》
CSCD
北大核心
2005年第1期71-78,共8页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金资助项目 40 1 350 2 0和 40 2 330 31
