大气对南极冰异常的低频遥响应

THE ATMOSPHERIC LOW FREQUENCY TELERESPONSE TO ANOMALIES IN THE ANTARCTIC SEA ICE

关键词:  大气环流  遥相关波列  季节内振荡

Key words:  Atmospheric circulation  Teleconection-wavetrain  Intraseasonal oscillation

摘要:

运用IAPGCM模式证实了大气对南极冰异常的强迫遥响应是激发全球大气季节内振荡的重要机制,进而着重考察了候平均偏差结果的时间序列,并且通过带通滤波处理,特别分析了响应场中30-60天低频振荡的重要特征,发现:大气对南极冰减退的响应是一种具有30-60天周期的低频遥响应。强迫场中的重要成分是30-60天季节内振荡,并且具有同实际大气中的低频振荡相类似的垂直结构以及传播和分布特征。

Abstract:

By using IAP-GCM,it is proved that the anomaly in the Antarctic ice is one of the important mechanisms to cause intraseasonal oscillation in the global atmosphere.The time sequence of pentadly mean depature field is analized in this paper by using the band pass filtering scheme.With special attention to the characteristics of 30-60 day oscillation in the response field,it was found that the global atmosphere behaves long-time teleresponse to an anomalous external forcing from the Antarctic sea ice,whose period ranges from thirty to sixty days.30-60 day oscillation plays an important role in the forcing field,whose vertical structure,zonal propagation and distribution characteristics in the model atmosphere is similar to that in the real atmosphere.