Tropical cyclones impact on tropopause and the lower stratosphere vapour based on satellite data,Atmospheric Science Letters

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Tropical cyclones impact on tropopause and the lower stratosphere vapour based on satellite data
Atmospheric Science Letters ( IF 2.0 ) Pub Date : 2020-08-22 , DOI: 10.1002/asl.1006
Baolin Jiang _{1,

2} , Wenshi Lin ₂ , Chundi Hu _{2,

3,

4} , Yali Wu ₂

Affiliation

As one of the deep convection systems, tropical cyclones (TCs) could significantly affect the thermodynamic structure and cloud microphysical processes near the tropopause, which may cause changes in troposphere and stratosphere water vapour activity, with important influences on global climate change. However, the effects of TCs on tropopause and the lower stratosphere water vapour remain unclear. Here, we use satellite data from year 2012 to 2016 to assess the effect of TCs on water vapour at the tropopause and in the lower stratosphere over the Northwest tropical Pacific Ocean. It is found that TCs could decrease the tropopause temperature and increase the process of water vapour deposition on cloud ice to a certain extent. This process can increase cloud ice mixing ratio and then dehydrate the tropopause. Part of the small cloud ice particles will be injected into the lower stratosphere, where they would be sublimated, hydrating the lower stratosphere. Compared to non‐TC area, the average water vapours in TC area decrease about 1.04 ppmv near the tropopause, but increase by 0.75 ppmv in the lower stratosphere.

中文翻译：

根据卫星数据，热带气旋对对流层顶和平流层下部蒸气的影响

作为深对流系统之一，热带气旋（TC）可能显着影响对流层顶附近的热力学结构和云微物理过程，这可能导致对流层和平流层水蒸气活动发生变化，并对全球气候变化产生重要影响。但是，TCs对对流层顶和平流层下部水蒸气的影响仍不清楚。在这里，我们使用2012年至2016年的卫星数据来评估TC对西北热带太平洋对流层顶和平流层下层水汽的影响。研究发现，TCs可以在一定程度上降低对流层顶温度，并增加水蒸气在云冰上的沉积过程。这个过程可以增加云冰的混合比例，然后使对流层顶水脱水。部分云雾小颗粒将被注入到平流层下部，在那里它们将被升华，为低平流层水化。与非TC区域相比，TC区域的平均水蒸气在对流层顶附近减少约1.04 ppmv，但在低平流层增加0.75 ppmv。

更新日期：2020-08-22

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