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根据欧洲中期数值预报中心提供的大气环流资料和NOAA提供的海温资料,应用改进的低阶谱模式方法研究了海温异常对西太平洋副热带高压脊面演变影响的物理机制.结果表明,在ElNio型海温强迫下,大气环流内部动力过程中的大尺度波波和波流相互作用较弱.随着外部热源强迫从冬季型向夏季型推进,西太平洋副热带高压脊面北进不明显,使得夏季西太平洋副热带高压脊面相对偏南.在LaNia型海温强迫下,大气环流内部动力过程中的大尺度波波和波流相互作用明显.随着外源强迫从冬季型向夏季型转变,西太平洋副热带高压脊面将随之向北移动19个纬度左右,使得夏季西太平洋副热带高压脊面偏北;且北移到达一定纬度后,西太平洋副热带高压脊面表现出较为显著的30～60d季节内南北振荡,振幅在4°～7°之间.不同海温异常型所导致的大气内部动力过程差异是造成西太平洋副热带高压脊面年际变化的重要原因之一.
According to the atmospheric circulation data provided by the European Center for Mid-term Numerical Prediction and the sea temperature data provided by NOAA, the physical mechanism of the SST anomaly on the evolution of the western Pacific subtropical high is studied by using the improved low-order spectral model. The results show that in ElNi Under the forced o-SST, the interaction between the large-scale wave and the wave current in the internal dynamic process of the atmospheric circulation is weak.With the external heat source forcing from the winter type to the summer type, the North Pacific of the western Pacific subtropical high is not obvious, In the summer, the western Pacific subtropical ridge is relatively southward, and the interaction between the large-scale wave and the wave current in the internal circulation of the atmospheric circulation is significant under the forced LaNia sea-temperature regime.With the exogenous forcing changing from winter to summer , The western Pacific subtropical ridge will move northward by about 19 latitudes in summer, which makes the western Pacific subtropical ridge in summer move northward. After the northward migration reaches a certain latitude, the western Pacific subtropical ridge shows a significant 30-60d season North-South oscillation with amplitudes between 4 ° and 7 ° Differences in atmospheric dynamic processes caused by different sea surface temperature anomalies are the result of the Western Pacific One of the important reasons for the interannual variation of the Pacific subtropical high ridges.