Dynamically Organized Storm Tracks and Jets in Baroclinically Active Flows

斜压活跃流中动态组织的风暴轨迹和急流

• 批准号: 9113740
• 负责人: R. Lee Panetta
• 金额: $ 24.35万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-15 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9113740&HistoricalAwards=false
• 关键词: Dynamically; Organized; Storm; Tracks; Jets

The PI's prior work on an essential problem in geophysical fluid dynamics showed that a randomly turbulent mean flow can self- organize into slowly varying zonal jets with flanking patches of high-frequency smaller scale eddies ("storm tracks") under certain conditions. The principal requirement is that the fluid contain vertical and horizontal shears of flow and temperature differences that combine to provide a particular type of instability often found in real atmospheres and oceans. This realistic behaviour developed, and was maintained, in a model with a highly idealized set of theoretical restrictions. His proposed strategy is to gene- rate a small suite of less restricted, but still highly abstract, models by judicious removal of carefully selected simplifications. These would be chosen to illuminate the specific model properties responsible for producing these realistic features as well as for limiting their degree of verisimilitude when compared with planetary-scale atmospheric and oceanic circulations. Another stated purpose is to test the robustness of the verisimilitude already achieved, and to demonstrate that this degree of realism is not an artifact of the mathematical simplifications imposed in earlier models. Such stepwise building of basic understanding will contribute to future advances in extended-range forecasting and climate modelling.

PI先前在地球物理流体动力学中的基本问题上的工作表明，随机湍流平均流量可以自我组织成缓慢变化的层状射流，并在某些条件下具有高频较小的涡流（“风暴轨迹”）的侧翼斑块。主要要求是，流体包含流动和温度差异的垂直和水平剪切，这些剪切结合起来提供了在实际大气和海洋中经常发现的特定类型的不稳定性。这种现实的行为在具有高度理想化的一组理论限制的模型中得以发展并得到了维持。他提出的策略是通过明智地删除精心选择的简化方法来构成一小部分限制较少但仍然高度抽象的套件。 这些将被选为阐明负责产生这些现实特征的特定模型特性，以及与行星规模的大气和海洋循环相比，它们限制了它们的真实程度。另一个陈述的目的是测试已经达到的真实性的鲁棒性，并证明这种现实主义并不是早期模型中实施的数学简化的伪像。这种逐步建立基本理解将有助于扩展范围预测和气候建模的未来进步。