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

气溶胶/边界层云相互作用的基础研究以及包括这些过程的参数化的开发

• 批准号: 9904128
• 负责人: William Cotton
• 金额: $ 37.53万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-01 至 2002-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9904128&HistoricalAwards=false
• 关键词: Fundamental; Studies; Aerosol; Boundary; Layer

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.

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，以及水和陆地表面上边界层层云、层积云和积云的云辐射特性。 利用大涡模拟（LES）与箱分辨微物理的结果的指导下，PI寻求开发一个统一的云边界层参数化方案，可以准确地表示固体层云层，积云顶部的边界层，积云层云层下。 他们还将探索这些云对不同浓度的云凝结核（CCN），超巨型气溶胶和冰形成核（IFN）的反应。 具体任务是：（1）研究从上覆稳定层夹带到多云边界层中的气溶胶对云层辐射特性的影响;（2）发展一个云顶边界层的质量通量对流羽流型单柱模式，该模式与一个包括动态活动气溶胶（CCN）的云微物理方案相连接;（3）用一个LES模式和一个陆面土壤/植被模式耦合，对陆地上空的多云边界层进行模拟;（4）通过在GEWEX云系统研究（GCSS）下组织的讲习班，参与LES和单柱模式的相互比较边界层云工作组。该研究是NSF的水和能源：大气，植被和地球相互作用（WEAVE）工作的一部分。