Transport and mixing of chemical air masses in idealized baroclinic life cycles
Transport and mixing of chemical air masses in idealized baroclinic life cycles
复制标题
理想斜压生命周期中化学气团的传输和混合
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. G. Esler
中科院分区：
文献类型：
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作者：
L. Polvani;J. G. Esler
[1]运输，混合，和三维演变的化学性质不同的空气质量内增长斜压波研究理想化的，高分辨率的，生命周期的实验，使用适当初始化的被动示踪剂，对比两个著名的生命周期的范例，区分主要是反气旋（LC 1）或气旋（LC 2）流在上层。平流层-对流层交换在两个生命周期之间有显著差异。具体来说，从平流层到对流层的传输是显着较大的LC 2（通常为50%），由于存在大而深的气旋涡流，创造了更广泛的冲浪区比LC 1。相反，对流层空气进入平流层的运输在两个生命周期之间几乎是相同的。上升到自由对流层的边界层空气的质量在两个生命周期中是相似的，但在LC 1的情况下，更多的是直接注入平流层（大约四倍）。然而，对于LC 2，边界层与平流层空气的总混合更大，这是由于存在深气旋性涡旋，该涡旋夹带并混合来自地面的边界层空气和来自上层的平流层空气。对于LC 1，边界层和平流层空气通过在中层下部急流向极地一侧发展的较小气旋结构聚集在一起，导致相应较弱的对流层。
[1] The transport, mixing, and three-dimensional evolution of chemically distinct air masses within growing baroclinic waves are studied in idealized, high-resolution, life cycle experiments using suitably initialized passive tracers, contrasting the two well-known life cycle paradigms, distinguished by predominantly anticyclonic (LC1) or cyclonic (LC2) flow at upper levels. Stratosphere-troposphere exchange differs significantly between the two life cycles. Specifically, transport from the stratosphere into the troposphere is significantly larger for LC2 (typically by 50%), due to the presence of large and deep cyclonic vortices that create a wider surf zone than for LC1. In contrast, the transport of tropospheric air into the stratosphere is nearly identical between the two life cycles. The mass of boundary layer air uplifted into the free troposphere is similar for both life cycles, but much more is directly injected into the stratosphere in the case of LC1 (fourfold, approximately). However, the total mixing of boundary layer with stratospheric air is larger for LC2, owing to the presence of the deep cyclonic vortices that entrain and mix both boundary layer air from the surface and stratospheric air from the upper levels. For LC1, boundary layer and stratospheric air are brought together by smaller cyclonic structures that develop on the poleward side of the jet in the lower part of the middleworld, resulting in correspondingly weaker
影响因子：
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作者：
G. Berthet;J. G. Esler;P. Haynes
通讯作者：
G. Berthet;J. G. Esler;P. Haynes