Decomposition of Boundary-layer Turbulence in HAPEX

HAPEX 中边界层湍流的分解

• 批准号: 8820090
• 负责人: Larry Mahrt
• 金额: $ 23.83万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-02-01 至 1993-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8820090&HistoricalAwards=false
• 关键词: Decomposition; Boundary; layer; Turbulence; HAPEX

The interaction between surface evaporation/evapotranspiration and atmospheric boundary layer processes constitutes a research area of considerable interest and need for both atmospheric and water management disciplines. For example, the World Climate Research Program emphasizes the urgency of extensive observational work in this area and it is recognized that such information is an important next step in improving climate models. One of the most carefully conducted field programs ever attempted to study surface moisture fluxes in complex terrain, known as the Hydrological and Atmospheric Pilot Experiment (HAPEX), was completed in the Spring and Summer of 1986. The Principal Investigator participated in the planning and execution of this experiment. The field phase of the HAPEX was very successful and the Principal Investigator will continue his analysis of this rich data set. Aircraft and surface-based mesonetwork data will be used to examine the contributions of various physical mechanisms (e.g. free and forced thermals, shear modified convection, cloud controlled turbulence, surface inhomogeneity and local circulation) to boundary layer fluxes. Different contributions to the flux will be related to such factors as the background synoptic conditions and overall atmospheric stability.

表面蒸发/蒸散与大气边界层过程之间的相互作用构成了大气和水管理学科非常感兴趣和需要的研究领域。 例如，世界气候研究计划强调在这一领域开展广泛观测工作的紧迫性，并认识到此类信息是改进气候模型的重要下一步。 水文和大气试点实验 (HAPEX) 是迄今为止研究复杂地形中表面水分通量的最仔细的实地计划之一，于 1986 年春夏完成。首席研究员参与了计划和执行这个实验的。 HAPEX 的现场阶段非常成功，首席研究员将继续分析这一丰富的数据集。 飞机和基于表面的介观网络数据将用于检查各种物理机制（例如自由和强制热气流、剪切修改对流、云控制湍流、表面不均匀性和局部环流）对边界层通量的贡献。 对通量的不同贡献将与背景天气条件和总体大气稳定性等因素有关。