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.

表面之间的相互作用 蒸发/蒸散和大气边界层 过程构成了一个相当感兴趣的研究领域 需要大气和水管理学科。 例如，世界气候研究计划强调， 在这一领域进行广泛的观测工作的紧迫性， 认识到这些信息是重要的下一步， 改进气候模型。 这是有史以来最仔细的实地项目之一 试图研究复杂地形下的地表水分通量， 被称为水文和大气试点实验 （HAPEX），于1986年春季和夏季完成。 的 主要研究者参与计划和执行 这个实验。 HAPEX的实地阶段非常成功， 首席研究员将继续分析这一丰富的 数据集 飞机和基于地面的mesnetwork数据将 用来研究各种物理机制的作用 (e.g.自由和强迫热气流，切变修正对流，云 受控湍流、表面不均匀性和局部 边界层通量（boundary layer flux） 不同贡献 通量与背景等因素有关， 天气条件和整体大气稳定性。