Decomposition of Boundary-layer Turbulence in HAPEX

地表蒸发/蒸散和大气边界层过程之间的相互作用是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，并认识到这种信息是改进气候模型的重要下一步。被称为水文和大气试验(HAPEX)的在复杂地形中试图研究地表水汽通量的最仔细的野外计划之一，于1986年春夏完成。首席调查员参与了这项实验的规划和执行。HAPEX的实地阶段非常成功，首席调查员将继续分析这一丰富的数据集。飞机和地面中间网络资料将被用来研究各种物理机制(如自由和强迫热力、切变修正对流、云控制的湍流、地面不均匀和局部环流)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度等因素有关。

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.