期刊
BOUNDARY-LAYER METEOROLOGY
卷 106, 期 3, 页码 507-525出版社
SPRINGER
DOI: 10.1023/A:1021226722588
关键词
canopy turbulence; mutual information content; nonlinear time series analysis; organized motion; Shannon entropy; wavelet thresholding
Using three methods from nonlinear dynamics, we contrast the level of organization in the vertical wind velocity (w) time series collected in the atmospheric surface layer ( ASL) and the canopy sublayer (CSL) for a wide range of atmospheric stability (xi) conditions. The nonlinear methods applied include a modified Shannon entropy, wavelet thresholding, and mutual information content. Time series measurements collected over a pine forest, a hardwood forest, a grass-covered forest clearing, and a bare soil, desert surface were used for this purpose. The results from applying all three nonlinear time series measures suggest that w in the CSL is more organized than that in the ASL, and that as the flows in both layers evolve from near-neutral to near-convective conditions, the level of organization increases. Furthermore, we found that the degree of organization in w associated with changes in. is more significant than the transition from CSL to ASL.
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