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大气科学  2013 

基本气流和边界层顶高度对低纬大气数值模拟的影响

DOI: 10.3878/j.issn.1006-9895.2013.12093

Keywords: 基本气流,边界层顶,误差,低纬模式

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Abstract:

本文研究了一个包含波动CISK(ConvectiveInstabilityoftheSecondKind)机制的扰动方程数值模式中,基本气流对低频振荡数值模拟的影响。结果显示,当基本气流为纬向均匀风场U时,振荡周期随U的增加而减小:当U取2ms-1时,周期从50~60d减小到30d;当U减小到-1ms-1时,振荡周期增加为70~80d。这是由于低频振荡是从西向东传播,西风基本气流能加快扰动东传,反之东风基本气流会抑制扰动东传,使振荡周期增加。同时,模式中的边界层顶出现误差时,模拟结果会有敏感的响应。若边界层顶取值比标准值高,对流加热反馈作用过大,出现扰动增长过快的现象,传播到80°~90°E附近时,扰动不再继续传播,而是无限增长;而边界层顶取值比标准值低时,对流加热反馈过小,扰动增长小且衰减加快,扰动传播不远便耗散到零,扰动循环周期表现为热源的周期。

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