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大气科学  2005 

北半球冬季准定常行星波的三维传播及其年际变化

DOI: 10.3878/j.issn.1006-9895.2005.01.16

Keywords: 准定常行星波波导E-P通量年际变化北极涛动

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Abstract:

作者回顾了应用叶笃正先生所创立的Rossby波频散理论,来研究准定常行星波在三维大气的能量频散以及在北半球冬季三维大气中的传播规律,并应用NCEP/NCAR再分析资料和由大气环流数值模拟所得的模式资料的40年风场、温度场资料计算了冬季北半球准定常行星波的E-P通量.计算结果表明了北半球冬季准定常行星波在三维大气传播具有沿两支波导的传播特征,这与从理论分析所得的结果相吻合.作者还分析了冬季准定常行星波的E-P通量分布的年际变化,分析结果表明了准定常行星波在北半球冬季三维大气中传播的这两支波导有明显的年际振荡;并且,从冬季准定常行星波的E-P通量辐散辐合的年际变化与北极涛动的年际变化相比较,发现准定常行星波两支波导的年际振荡直接影响着北极涛动(AO),因而说明了准定常行星波活动的年际变化可以影响对流层的气候变化.

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