Tropospheric Impact of Waves and Flows Generated by Landscape Heterogeneity: A Theoretical Investigation

本研究的总体目标是更好地了解与景观异质性对大气的影响相关的物理过程，并通过分析理论的发展，为更大尺度模型中这些影响的参数化做出贡献。主要研究人员将侧重于：在以前的支持下开发的分析理论的进一步发展;调查平坦景观中景观变化产生的持续中尺度流动和波浪的作用;评估这些大气流动对对流层结构的影响，特别是稳定性和风廓线。这项研究的需要是出于对以前完成的现场实验和相关数值结果的数据分析，这些结果表明，在自由大气中的签名可能与中尺度波和中尺度垂直输送。 这意味着，中尺度气流，这是产生在异质平坦景观，可以影响对流层的稳定性和风廓线，当这些流持续几天。首席研究员将量化中尺度印记的自由大气在晴朗的日子，微风条件。 此外，当环境风和稳定性剖面有利于传播波时，研究人员将确定这些扰动渗透到自由大气中的深度。 主要研究员将研究对流层环境如何受中尺度波能及相关动量汇聚和沉积的影响。这项研究的成功完成，最终可能会使数值模式的参数化更完善，并使这些模式的天气预报更准确。

The general aim of this research is to better understand the physical processes associated with the influence of landscape heterogeneity on the atmosphere, and, through the development of an analytic theory, to contribute to the parameterization of these effects on larger-scale models. The Principal Investigators will focus on: the further development of an analytic theory developed under previous support; investigating the role of persistent mesoscale flows and waves generated by landscape variability in flat landscapes; the evaluation of these atmospheric flows on tropospheric structures, specifically stability and wind profiles. The need for this study is motivated from the analysis of data from previously completed field experiments and related numerical results, which have shown that signatures in the free atmosphere may be related to mesoscale waves and mesoscale vertical transport. The implication is that mesoscale flow, which is generated over heterogeneous flat landscapes, can influence the tropospheric stability and wind profile, when these flows persist for a few days.The Principal Investigators will quantify the mesoscale imprint on the free atmosphere during clear days with light wind conditions. In addition, when the environmental wind and stability profiles are favorable to propagating waves, the researchers will determine how deeply these perturbations penetrate into the free atmosphere. The Principal Investigators will study how the tropospheric environment is influenced by mesoscale wave energy, and associated momentum convergence and deposition.Successful completion of this research could eventually lead to better parameterizations in numerical models and better weather forecasts from these models.