Convective Initiation in an Idealized Cloud Model Using an Updraft Nudging Technique
Convective Initiation in an Idealized Cloud Model Using an Updraft Nudging Technique
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使用上升气流微移技术在理想化云模型中引发对流
DOI：
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发表时间：
2012
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通讯作者：
M. Gilmore
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作者：
J. Naylor;M. Gilmore
AbstractPrevious云模拟研究已经注意到，当热泡技术用于启动对流时，在对流抑制和/或中层干燥的环境中产生强的、持续的深对流是困难的。这个困难也证明了在这里，使用113个超级细胞接近探测，其中大部分包含封顶反转和一定量的对流抑制。相反，通过使用上升气流轻推引发技术，实质上产生更多的超级单体并且持续更长的时间。此外，当仅在边界层顶部附近的第一个15分钟的云时间内应用上升气流轻推而不是更长/更短的时间或当在表面附近应用轻推时，产生超级单体的情况的数量最大化。
AbstractPrevious cloud modeling studies have noted difficulty in producing strong, sustained deep convection in environments with convective inhibition and/or midlevel dryness when the thermal bubble technique is used to initiate convection. This difficulty is also demonstrated herein, using 113 supercell proximity soundings—most of which contain capping inversions and some amount of convective inhibition. Instead, by using an updraft nudging initiation technique, substantially more supercells result and for a longer period. Additionally, the number of supercell-producing cases is maximized when updraft nudging is applied for only the first 15 min of cloud time near the top of the boundary layer instead of longer/shorter periods or when nudging is applied near the surface.