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大气科学  2001 

大气季节内振荡的耦合模式数值模拟

DOI: 10.3878/j.issn.1006-9895.2001.01.12

Keywords: 大气低频振荡,海气耦合模式

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Abstract:

分析GOALS/LASG海气耦合模式10年积分200hPa纬向风场的逐日输出结果,引用1980~1989年期间逐日的NCEP/NCAR再分析资料作为实测对照,结果显示该耦合模式抓住了热带大气低频振荡(IO)的基本时空分布特征,模拟IO的强度较多数大气模式强而接近真实,但空间一致性仍不清晰,典型周期不够显著。NCEP资料与耦合模式都反映模拟IO的季节变化与其年际变化有关,模拟较强IO的年份表现IO的季节变化特征也较真实。模拟IO的年际变化与热带东太平洋的SST呈明显的负相关变化。SST暖异常的年份,IO活动较弱。IO变化滞后于SST异常60天左右的相关性最显著。对比单独积分GOALS/LASG的大气模式的结果,发现二者的主要差别在于耦合模式再现IO的季节性特征更真实,反映了海气耦合对IO变化的调制作用。利用海气耦合模式,理解IO对流活动与上层海洋的相互作用过程,是真实描述IO必要的手段。

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