Wave Driving in the Tropical Lower Stratosphere as Simulated by WACCM. Part II: ENSO-Induced Changes for Northern Winter
Wave Driving in the Tropical Lower Stratosphere as Simulated by WACCM. Part II: ENSO-Induced Changes for Northern Winter
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DOI：
10.1175/2009jas3144.1
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发表时间：
2010-02
影响因子：
3.1
通讯作者：
M. Taguchi
中科院分区：
文献类型：
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作者：
M. Taguchi
利用全大气群落气候模式（WACCM）模拟了enso引起的北半球冬季热带平流层低层的变化。在赤道太平洋的拉尼娜和厄尔尼诺海表温度条件下，进行了两次3650天的持续一月实验的比较。本分析包括对第一部分中用于气候年循环的诊断框架的扩展。对enso引起的变化及其热量和纬向动量平衡诊断的全面描述表明，这些变化始终以冷却、局部加速的Brewer-Dobson环流（上升流和向极地流动）和增强的热带/亚热带波驱动为特征，导致了类似厄尔尼诺的条件。冷却在赤道附近广泛地达到峰值，具有一般的半球对称性，而向极地流动和波浪驱动的增强发生在两个半球。一个重要的角色……
Abstract This study investigates ENSO-induced changes in the tropical lower stratosphere for northern winter as simulated by the Whole Atmosphere Community Climate Model (WACCM). A comparison is made between two 3650-day perpetual January experiments forced with La Nina– and El Nino–like sea surface temperature conditions over the equatorial Pacific. The present analysis includes an extension of the diagnostic framework used for the climatological annual cycle in Part I. A comprehensive description of the ENSO-induced changes, together with their heat and zonal momentum budget diagnoses, demonstrates that the changes are consistently characterized by cooling, locally accelerated Brewer–Dobson circulation (upwelling and poleward flow) and strengthened tropical/subtropical wave driving for the El Nino–like condition. The cooling broadly peaks near the equator with general hemispheric symmetry, and the strengthenings in the poleward flow and wave driving take place in both hemispheres. An important role in t...