Wave-Wave Interactions and Upper Atmosphere Variability

波-波相互作用和高层大气变化

• 批准号: 1630177
• 负责人: Jeffrey Forbes
• 金额: $ 59.51万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-06-01 至 2022-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1630177&HistoricalAwards=false
• 关键词: Wave; Interactions; Upper; Atmosphere; Variability

Large-scale vertically-propagating waves such as planetary waves (PW) and tidal waves (TW) represent the primary means by which energy from lower atmosphere meteorological activity is transmitted into the upper atmosphere region. The coupling interaction between these waves is believed to be a source of strong variability that is transmitted into the upper atmosphere and ionosphere as secondary wave structures that could potentially affect navigation, communications and radar tracking systems. Understanding the origins of such variability in the mesosphere and lower thermosphere (MLT) region is one of the major challenges faced in space physics. This award would focus on studying these large-scale wave interactions and the secondary waves they produce by using a year-long dataset generated by the use of a NCAR general circulation model (TIME-GCM), coupled to the use of the Global Scale Wave Model (GSWM) that would provide simulations of the lower atmosphere inputs into the upper atmosphere model. The broader impacts of the research effort will be realized in several different ways: (a) engagement with a diverse population of students through partnership with the Broadening Opportunity through Leadership and Diversity (BOLD) Center; (b) engaging an undergraduate student in the research through the Discovery Learning Apprentice (DLA) Program; (c) leveraging the above connections to teach graduate students how to mentor. For individual cases where non-linear interactions are seen, a non-linear version of the GSWM model will be employed to perform numerical experiments, investigating factors such as how the phases of the two primary waves impact the generation of the secondary waves. The primary objectives of the work are as follows: 1) to delineate and understand the basic mechanisms underlying the interactions between PWs and tides propagating up from the lower atmosphere, 2) to quantify the variability imposed on the global atmosphere-ionosphere system by these interactions, and 3) to assess the implications for ground-based and space-based observing systems.

大规模垂直传播波，例如行星波（PW）和潮汐波（TW）代表了从低大气气象活动中传播到高层大气区域的主要手段。这些波之间的耦合相互作用被认为是强烈可变性的来源，它被传播到上层大气层和电离层中，因为次要波结构可能会影响导航，通信和雷达跟踪系统。了解这种变异性在中层和较低热层（MLT）区域的起源是空间物理学面临的主要挑战之一。该奖项将着重研究这些大规模波相互作用和通过使用NCAR通用循环模型（Time-GCM）生成的长达一年的数据集（Time-GCM）生成的次级波，并与全球规模波模型（GSWM）耦合，该模型（GSWM）将提供较低大气输入到上层大气模型的模拟。研究工作的更广泛的影响将以几种不同的方式实现：（a）通过通过领导力和多样性（BOLD）中心与扩大机会的合作，与多样化的学生互动； （b）通过发现学习学徒（DLA）计划让一名本科生参与研究； （c）利用上述联系来教授研究生如何指导。对于看到非线性相互作用的个别情况，将采用非线性版本的GSWM模型来执行数值实验，研究因素，例如两个主要波的相位如何影响次级波的产生。工作的主要目标如下：1）描绘和理解PWS与潮汐之间相互作用的基本机制和从较低大气中传播的潮汐之间的相互作用，2）2）通过这些相互作用量化对全球大气层层系统的可变性，以及3），以评估对地面和基于空间的观察系统的含义。