Wave Driving in the Tropical Lower Stratosphere as Simulated by WACCM. Part I: Annual Cycle
Wave Driving in the Tropical Lower Stratosphere as Simulated by WACCM. Part I: Annual Cycle
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DOI：
10.1175/2009jas2854.1
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发表时间：
2009-07
影响因子：
3.1
通讯作者：
M. Taguchi
中科院分区：
文献类型：
--
作者：
M. Taguchi
全文：pdf （1653 pdf）摘要：本文研究了全大气群落气候模式（WACCM） 50年模拟结果中热带平流层低层温度、环流和波浪驱动分布的年气候周期。模拟采用了气候海表温度和海冰条件。目前的诊断证实了该地区年循环的基本平衡，与北半球冬季较低的温度、较强的残余环流（上升流和局部经向外流）和附近较强的波驱动相一致。对波驱动的详细分析进一步表明，较强的波驱动主要发生在热带北部和亚热带地区，主要是由对流加热迫使赤道罗斯比波向北和向上传播（分别与纬向动量的经向通量和垂直通量有关），以及北半球温带行星波和天气波向赤道传播。
Abstract This study explores the climatological annual cycle of temperature, circulation, and wave driving distributions in the tropical lower stratosphere as produced in a 50-yr simulation of the Whole Atmosphere Community Climate Model (WACCM). The simulation is forced with a climatological sea surface temperature and sea ice condition. The present diagnoses verify the primary balances of the annual cycle in this region, consistent with lower temperatures, stronger residual circulation (upwelling and local meridional outflow), and nearby stronger wave driving for Northern Hemisphere (NH) winter. An in-detail analysis on the wave driving further reveals that the stronger driving, occurring mostly in the northern tropics and subtropics, is contributed by northward and upward propagation (associated with meridional and vertical fluxes of zonal momentum, respectively) of equatorial Rossby waves forced by convective heating, and also by equatorward propagation of NH extratropical planetary and synoptic waves...