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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Resolution Dependency of Numerically Simulated Stratosphere-to-Troposphere Transport Associated with Mid-Latitude Closed Cyclones in Early Spring around Japan
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Resolution Dependency of Numerically Simulated Stratosphere-to-Troposphere Transport Associated with Mid-Latitude Closed Cyclones in Early Spring around Japan

机译：日本初春与中纬度封闭气旋相关的平流层至对流层数值模拟的分辨率依赖性

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The resolution dependency of simulated stratosphere-to-troposphere transport (STT), associated with mid-latitude closed cyclones at mid- and upper-troposphere in early spring around Japan, was investigated using the Nonhydrostatic ICosahedral Atmospheric Model (NICAM), with three horizontal resolutions (～220, 56, and 14 km). We defined “STT-producing cyclone” as the developed mid-latitude cyclones that have isolated low pressure systems with closed contours at mid- and upper-troposphere, generated by the deepening of a trough. The STT-producing cyclone itself, with a large spatial scale, is well-simulated from three horizontal resolution experiments. As the horizontal resolution increased, the baroclinic zone on the rear side of the surface cold front became sharper along the southern areas of the upper low, bringing stratospheric dry air down to the troposphere. This comprises a sharp and deep intrusion of dry air into the troposphere, with increased dry air along the jet-axis. While the sufficient resolution for accurate estimation remains unclear, these results suggest that the minimum horizontal resolution for reproducing the sharp and deep intrusion from the stratosphere to the troposphere during the STT-producing cyclone events is approximately 14-56 km.
机译：使用非静水等面面大气模型（NICAM），研究了日本周围早春中空对流层上空和中纬度封闭气旋的模拟平流层-对流层运输（STT）对分辨率的依赖性。分辨率（〜220、56和14 km）。我们将“产生STT的旋风”定义为已发展的中纬度旋风，该旋风具有孤立的低压系统，在对流层中层和对流层上由海槽的加深产生了封闭的轮廓。产生STT的旋风分离器本身具有较大的空间比例，可以通过三个水平分辨率实验很好地模拟。随着水平分辨率的增加，地表冷锋后侧的斜压区沿上低层的南部变得更加尖锐，从而将平流层干燥的空气带入对流层。这包括干燥空气急剧深入地进入对流层，并沿喷射轴增加干燥空气。尽管尚不清楚用于准确估计的足够分辨率，但这些结果表明，在产生STT的气旋事件期间，再现从平流层向对流层的尖锐和深处侵入的最小水平分辨率约为14-56 km。

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