Planetary Boundary Layer Modeling Study

“行星边界层模拟研究”是大气模拟的一个重要方面，用于数值天气预报、天气风暴分析和气候研究。涉及到行星边界层(PBL)中的物理过程的表示，PBL是最接近地表的大气层。在体积常系数的总体简化和湍流方程的复杂但计算成本较高的高阶封闭之间，仍有改进的空间。首席研究员的PBL模型是探索这一领域的一个很好的候选模型。这是一个取决于大气层结、地表粗糙度和斜压性的两层模式。用模式得到的风可以用来估计地面风和风应力，以确定进入边界层的动量、热量和水汽通量。在这个奖项下，首席研究人员希望证明他的相对简单的分析性PBL模型可以提供与非常复杂的PBL模型获得的结果相当的边界性质估计，但在计算上节省了相当多的费用。模型结果的适用性也将通过与各种大气条件下边界层的实际测量结果进行比较来检验。最后，首席研究人员将评估大尺度涡旋在边界层中所起的作用。这项研究很重要，因为大气科学界仍然无法充分了解大气边界层极其复杂的过程及其在数值模式中的表现。

"Planetary Boundary Layer Modeling Study" One of the important aspects of modeling the atmosphere for numerical weather prediction, synoptic storms analyses, and climate studies, involves the representation of the physical processes in the planetary boundary layer (pbl), the atmospheric layer closest to the surface. Between the gross simplifications of bulk-type constant coefficients and the sophistication, but computationally high-cost, of higher order closure of the turbulence equations, there is room for improvement. The principal investigator's pbl model is a good candidate for exploring this area. It is a two-level model that depends on the atmospheric stratification, surface roughness, and baroclinicity. Winds obtained with the model can be used to estimate the surface winds and wind stresses needed to determine the fluxes of momentum, heat, and moisture into the boundary layer. Under this award, the principal investigator hopes to demonstrate that his relatively simple analytical pbl model can provide estimates of the boundary properties that are comparable to results obtained with very complex pbl models, but with considerable savings in computations. The applicability of the model results will also be tested by comparing them with actual measurements of the boundary layer under a variety of atmospheric conditions. Finally, the principal investigator will evaluate the role that large scale eddies play in the boundary layer. This research is important because a full understanding of the extremely complex processes of the atmospheric boundary layer, and their representation in numerical models, continues to elude the atmospheric sciences community.