Fundamental Studies of Aerosol/Boundary Layer Cloud Interactions and Development of Parameterizations Including Those Processes

该项目的目标是更好地了解气溶胶、云动力学和降水过程之间的复杂相互作用，以及水和地面上边界层层、层积云和积云的云辐射特性。利用面元分辨微物理大涡模拟(LES)的结果，PI试图发展一个统一的云边界层参数化方案，该方案可以准确地表示固体层、积云顶部的边界层和层状层下的积云。他们还将探索这些云对不同浓度的云凝结核(CCN)、超大气溶胶和结冰核(干扰素)的反应。具体任务是：(1)研究从上覆稳定层带入云边界层的气溶胶对云层辐射特性的影响；(2)发展一个质量通量对流羽型单柱云顶边界层模式，该模式与包括动态活动气溶胶(CCN)的云微物理方案相接口；(3)使用具有面元分辨率微物理的LES模式和陆面土壤/植被模式耦合来模拟陆地上的云边界层；以及(4)通过Gewex云系统研究(GCS)边界层云工作组组织的讲习班，参加大涡模拟和单柱模式的相互比较。这项研究作为美国国家科学基金会水与能源：大气、植物和地球相互作用(Weave)努力的一部分得到了支持。

The goal of this project is to better understand the complex interactions among aerosols, cloud dynamics, and precipitation processes, and cloud radiative properties of boundary layer stratus, stratocumulus, and cumuli over water and over land surfaces. Using guidance from the results of large-eddy simulations (LES) with bin-resolving microphysics, the PIs seek to develop a unified cloud boundary layer parameterization scheme that can accurately represent solid stratus layers, cumulus-topped boundary layers, and cumulus under stratus layers. They will also explore the response of these clouds to varying concentrations of cloud condensation nuclei (CCN), ultra-giant aerosols, and ice forming nuclei (IFN). The specific tasks are to: (1) examine the influence of aerosols entrained from the overlying stable layer into the cloudy boundary layer on the radiative properties of the cloud layer; (2) develop a mass-flux convective plume-type single-column model of the cloud-capped boundary layer that is interfaced to a cloud microphysics scheme including dynamically active aerosols (CCN); (3) perform simulations of the cloudy boundary layer over land using an LES model with bin-resolving microphysics and coupled to a land surface soil/vegetation model; and (4) participate in both LES and single-column model intercomparisons through workshops organized under the GEWEX Cloud System Studies (GCSS) Working Group on Boundary Layer Clouds. The research is supported as part of NSF's Water and Energy: Atmospheric, Vegetative, and Earth Interactions (WEAVE) effort.