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首页> 外文期刊>Atmospheric chemistry and physics >A global non-hydrostatic model study of a downward coupling through the tropical tropopause layer during a stratospheric sudden warming
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A global non-hydrostatic model study of a downward coupling through the tropical tropopause layer during a stratospheric sudden warming

机译：对流层突然变暖过程中穿过热带对流层顶向下耦合的全球非静水模型研究

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摘要

The dynamical coupling process between the stratosphere and troposphere in the tropical tropopause layer (TTL) during a stratospheric sudden warming (SSW) in boreal winter was investigated using simulation data from a global non-hydrostatic model (NICAM) that does not use cumulus parameterization. The model reproduced well the observed tropical tropospheric changes during the SSW, including the enhancement of convective activity following the amplification of planetary waves. Deep convective activity was enhanced in the latitude zone 20-10 degrees S, in particular over the southwest Pacific and southwest Indian Ocean. Although the upwelling in the TTL was correlated with that in the stratosphere, the temperature tendency in the TTL changed little due to a compensation by diabatic heating originating from cloud formation. This result suggests that the stratospheric meridional circulation affects cloud formation in the TTL.
机译：利用不使用积云参数化的全球非静水模型（NICAM）的模拟数据，研究了北方冬季平流层突然变暖（SSW）期间热带对流层顶层（TTL）的平流层与对流层之间的动力耦合过程。该模型很好地重现了南半球期间观测到的热带对流层变化，包括随着行星波放大后对流活动的增强。在南纬20-10度，特别是在西南太平洋和印度洋西南部，深对流活动得到增强。尽管TTL的上升流与平流层中的上升流相关，但由于云形成引起的绝热加热的补偿，TTL的温度趋势变化不大。这个结果表明平流层子午环流影响着TTL中云的形成。

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