Decomposition of Boundary-layer Turbulence in HAPEX

地表蒸发/蒸散发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相当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，并认识到这类信息是改进气候模式的重要下一步。1986年春夏完成了水文和大气试点实验（HAPEX），这是迄今为止进行得最仔细的实地项目之一，旨在研究复杂地形下的地表水分通量。首席研究员参与了本实验的计划和执行。HAPEX的实地阶段非常成功，首席研究员将继续对这一丰富的数据集进行分析。飞机和基于地面的中网数据将用于研究各种物理机制（如自由和强迫热气流、剪切修正对流、云控制湍流、地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。

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.