CAREER: The Marine Cloud-Topped Planetary Boundary Layer (PBL) and Large-Scale Circulations

事业：海洋云顶行星边界层 (PBL) 和大规模环流

• 批准号: 9985413
• 负责人: Bjorn Stevens
• 金额: $ 43.4万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-01 至 2006-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9985413&HistoricalAwards=false
• 关键词: CAREER; Marine; Cloud; Topped; Planetary

The planetary boundary layer (PBL) is the lowest layer of the atmosphere - the layer in immediate contact with the earth's surface - through which heat, momentum, moisture, gaseous species, and aerosol particles are transported between the free atmosphere and the surface. It is no surprise that processes in the PBL have a bearing not only on local phenomena such as air pollution, wind, and precipitation, but also on the climate itself through interactions with larger scale processes. The research component of this CAREER award focuses on two questions: (1) How does the PBL interact with the large-scale, thermally driven, tropical atmospheric circulation? (2) How does precipitation from clouds that form in the PBL modify the dynamics of this interaction? The approach to each question is through numerical modeling. For the first, a General Circulation Model (GCM) is modified to represent more accurately the physical processes in the PBL. For the second, large eddy simulations (LES) are employed to determine how the vertical structure of the PBL is affected by precipitation. The educational component of the work consists of developing an upper-level undergraduate course on the interaction of large scale atmospheric flow with the PBL and establishing a climate simulation laboratory. The results of the effort will be improved climate simulation and better opportunities for students to be trained in the numerical modeling of climate.

行星边界层（PBL）是大气的最底层——与地球表面直接接触的一层——热量、动量、水分、气态物质和气溶胶粒子通过它在自由大气和地表之间传输。PBL的过程不仅与空气污染、风和降水等局部现象有关，而且通过与更大尺度过程的相互作用也与气候本身有关，这一点并不奇怪。该职业奖的研究部分集中在两个问题上：(1)PBL如何与大尺度、热驱动的热带大气环流相互作用？(2) PBL中形成的云的降水如何改变这种相互作用的动力学？每个问题的解决方法都是通过数值模拟。首先，对大气环流模型（General Circulation Model， GCM）进行了改进，使其能够更准确地反映PBL的物理过程。其次，采用大涡模拟（LES）来确定降水对PBL垂直结构的影响。这项工作的教育部分包括开设一门关于大尺度大气流动与PBL相互作用的高级本科课程，并建立一个气候模拟实验室。努力的结果将是改善气候模拟，并为学生提供更好的气候数值模拟训练机会。