西太平洋海温和北极海冰异常对大气环流的影响

利用九层菱形截断１５波的全球大气环流谱模式，对赤道西太平洋海表温度，北极海冰及综合异常精形在北半球夏季大气环流中的作用进行了一系列数值试验和分析。结果表明：赤道西太平洋海表温度的异常变化与北极海冰面呼焦异均可显著影响大气环流，但海冰异常对低纬大气环流的影响远小于西太平洋的海温异常的影响。对全球大气环流异常形成机制的讨论，表二维Ｒｏｓｓｂｙ波开的传播及外强迫引起的大气内部动力学过程虽夏季大气环流异常

Response of the Genera lCirculation toWestern Pac ific Sea Surface Tempera ture Anomalies and NorthPole Sea Ice Area Anoma lies in Summer

By using a nine layer global spectral GCM which is rhomboidally truncated at wave number 15, a series of numerical experiments are conducted to study the effects of tropic West Pacific SSTA and the North Pole sea ice anomalies on the general circulation round the globe.Results show that the North Pole sea ice anomalies and SSTA of tropic West Pacific have very clear forcing effects on the global general circulation anomalies.The effect of sea ice anomalies on the general circulation of low latitude is much lesser than that of west tropical SSTA.The discussion on the formation mechanism of the global general circulation anomalies reveals that it is the propagation of two dimensional Rossby wave train and the internal atmospheric dynamic process due to external forcing that mainly cause the summer general circulation anomalies.