Effects of the pressure perturbation field in numerical models of unidirectionally sheared thunderstorm convection - Two versus three dimensions

Effects of the pressure perturbation field in numerical models of unidirectionally sheared thunderstorm convection - Two versus three dimensions
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单向剪切雷暴对流数值模型中压力扰动场的影响 - 二维与三维

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发表时间：
1984
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通讯作者：
R. Schlesinger
R. Schlesinger
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作者：
R. Schlesinger

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摘要 使用常见环境剖面的二维和三维滞弹性数值模拟实验来研究强剪切对流风暴中压力扰动场的两个方面：1）所谓“浮力”和“动”压力分量的物理作用，2）浮力和静水压力扰动之间的区别。二维和三维模型是类似的，只是二维网格域长约 50%，以适应二维风暴环流随时间的扩大。压力分析有助于澄清二维和三维风暴之间的某些显着差异，最显着的是二维风暴核心相对于直立的三维风暴核心的明显下切变倾斜的二维主上升气流要弱得多，以及二维主要多云上升气流的干燥二次上升气流下切变，在三维中没有类似物：在主上升气流中，强...
Abstract Two- and three-dimensional anelastic numerical modeling experiments with common environmental profiles are used to study two aspects of the pressure perturbation field in strongly sheared convective storms: 1) the physical roles of the so-called “buoyant” and “dynamic” pressure components, and 2) the distinction between the buoyant and hydrostatic pressure perturbations. The two- and three-dimensional models are analogous except that the two-dimensional grid domain is about 50% longer in order to accommodate a broadening of the two-dimensional storm circulation with time. The pressure analysis helps to clarify certain marked differences between the two-dimensional and three-dimensional storms, most notably a much weaker main updraft in two dimensions pronounced downshear tilt of the two-dimensional storm core versus an erect three-dimensional storm core, and a dry secondary updraft downshear of the main cloudy updraft in two dimensions with no analog in three dimensions: In the main updraft, stro...