大气位势场对海表温度异常线性定常响应的数值试验
LINEAR STATIONARY RESPONSE IN ATMOSPHERIC POTENTIAL HEIGHT TO SST ANOMALY
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摘要: 利用具有月、季长期天气过程数值天气预报能力的滤波距平模式(FAM)、运用谱方法研究了大气位势场对海表温度异常(SSTA)的线性定常响应,分析了SSTA强迫作用所产生的定常行星波波型、大气中遥相关型以及大气位势场响应对SSTA位置和基本气流的敏感性,得到一些有意义的结果。Abstract: In this paper, with the spectral method, linear stationary responces in the atmosphere to SST anomaly (SSTA) are investigated using filtered anomaly model (FAM)which has a basis to be able to predict numerically weather process for the monthly or season scale. The teleconnection patterns, the stationary planetary wavetrans induced by SSTA in the atmosphere and sensitivity of atmospheric anomaly field to SSTA location and basic stream field have been analysed. The conclusions are as follows: First, it is pointed out that FAM has a ability to simulate the teleconnection patterns and stationary wavetrains forced by SSTA. Second, there are important influences of tropical heating anomaly- on stationary wave patterns at mid-high latitude. The remote influences of tropical heating source on the atmosphere at mid-high latitude are more important than the influences of local heating source in some cases. Third, from the results of numerical experiments, it is quite important to predict accurately the SST for the atmospheric prediction. Fourth, it is indicated from the numerical results of FAM that besides the wavetrain in the direction of the northeast of SSTA location, there is another wavetrain in the direction of the northwest of one. Fifth, there is a clear benefit using spectral method to solve the FAM equation rather than finite difference method. This is a quite satisfied method to solve FAM equation.
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