Orthonormal Wavelet Analysis of Space-Scale Relationships in the Atmospheric Boundary Layer Over Complex Terrain

研究建议提高我们对局地和区域尺度大气-地表关系的认识。该项目将包括对大气边界层的分析，以研究湍流空间尺度的关系。大气边界层（ABL）输运的参数化对于量化非均匀区域的地表通量至关重要，因为ABL整合了区域尺度的通量。开展分析所需的实验数据已经收集完成：1)加州大学戴维斯分校附近的野外（1公里长度尺度）实验，2)南加州Ojai山谷的盆地（15公里长度尺度）实验，3)法国西南部朗德地区（100公里长度尺度）实验，作为hahex - mobilhy项目的一部分。利用紧支撑正交小波展开分析不同区域的地表热通量在惯性子范围内不同波数的空间间接性。此外，对于不同大气稳定条件下的感热通量和潜热通量，应采用双光谱，使湍流能量能够在空间尺度上表示。本文还分析了不同尺度下热通量的空间概率分布。该项目将为ABL模型的开发提供基础信息，以参数化大气环流模型中的地表通量。

Research is proposed to improve our understanding of atmosphere- land surface relationships at local and regional scales. The project will involve analysis of the atmospheric boundary layer to study turbulent space-scale relationships. Parameterizations of the Atmospheric Boundary Layer (ABL) transport are critical for quantifying surface fluxes over heterogeneous regions since the ABL integrates regional scale fluxes. The experimental data necessary to carry out the analysis have already been collected: 1) Field (1 km length scale) experiments near UC Davis, 2) Basin (15 km length scale) experiments in Ojai Valley southern California, 3) Regional (100 km length scale) experiments in the Landes Regional in southwestern France as part of HAPEX-MOBILHY. The data collected over the different regions will be analyzed using compactly supported orthonormal wavelet expansions to study spatial intermittency of the surface heat fluxes for various wave numbers in the inertial subrange. In addition dual spectra, which enable a space-scale representation of the turbulent energy, shall be applied to sensible and latent heat fluxes for different atmospheric stability conditions. The spatial probability distribution of the heat fluxes at various scales will be also analyzed. Ultimately this project will provide basic information for the development of models of the ABL to parameterize surface fluxes in general circulation models.