The effect of synoptic-scale wave breaking on cross tropopause transport and trace gas distribution

对流层顶和所谓的对流层顶逆温层（TIL），这是一个高静态稳定性的层作为一个部分可渗透的障碍，对流层和平流层之间的微量气体交换。对流层顶区域对气候特别重要。导致TIL形成的过程及其在平流层-对流层交换（STE）和对流层顶区域的化学组成中的作用还不完全清楚。理想模式的试验表明，在斜压生命周期中天气尺度波的破碎导致了TIL的形成。在这样的事件的动力条件是有利的STE和对流层顶的不可逆的成分交换。本计画将结合理想模式、观测资料与统计方法，提出一种新的方法，以辨识天气尺度波浪破碎与TIL形成对STE的影响。为此目的，我们将应用：（一）相同的分析方法，理想化的模型包含人工示踪剂和痕量气体观测（二）aquaplanet模拟与完整的化学方案和物理的全球模型，以确定全球影响的斜压生命周期的TIL形成和相关的痕量气体分布。

The tropopause and the so-called tropopause inversion layer (TIL), which is a layer of high static stability act as a partly permeable barrier to trace gas exchange between the troposphere and the stratosphere. The tropopause region is of particular importance for climate. The processes which lead to the formation of the TIL and their role for stratosphere-troposphere-exchange (STE) and the chemical composition of the tropopause region are incompletely understood. Experiments with idealized models show that synoptic scale wave breaking in baroclinic life cycles leads to TIL formation. The dynamical conditions during such an event are favorable for STE and an irreversible constituent exchange across the tropopause. This project will constitute a novel approach to identify the effect of synoptic-scale wave breaking and TIL formation on STE combining idealized models and observations with statistical methods. For this purpose we will apply: (i) the same analysis methods for idealized models containing artificial tracers and trace gas observations (ii) aquaplanet simulations with a full chemical scheme and the physics of a global model, to identify the global effect of baroclinic life cycles on TIL formation and the related trace gas distribution.