探寻亚马逊森林上空大气湍流中的混沌与相干结构。

Searching chaos and coherent structures in the atmospheric turbulence above the Amazon forest.

作者信息

Campanharo A S L O, Ramos F M, Macau E E N, Rosa R R, Bolzan M J A, Sá L D A

机构信息

Instituto Nacional de Pesquisas Espaciais (INPE), 12227-010 São José dos Campos, São Paulo, Brazil.

出版信息

Philos Trans A Math Phys Eng Sci. 2008 Feb 28;366(1865):579-89. doi: 10.1098/rsta.2007.2118.

DOI:10.1098/rsta.2007.2118

PMID:17698463

Abstract

In this work, the possible chaotic nature of the atmospheric turbulence above a densely forested area in the Amazon region is investigated. To this end, we use high-resolution temperature data obtained during a micrometeorological measurement campaign in the Brazilian Amazonia. Estimates of the correlation dimension (D(2)=3.50+/-0.05) and of the largest Lyapunov exponent (lambda(1)=0.050+/-0.002) suggest the existence of chaos in the atmospheric boundary layer. Our findings indicate that this low-dimensional chaotic dynamics is associated with the presence of the coherent structures within the boundary layer right above the canopy top and not with the atmospheric turbulence per se, as previously claimed.

摘要

在这项工作中，对亚马逊地区茂密森林上方大气湍流可能存在的混沌特性进行了研究。为此，我们使用了在巴西亚马逊地区进行的微气象测量活动期间获得的高分辨率温度数据。关联维数（D(2)=3.50±0.05）和最大Lyapunov指数（λ(1)=0.050±0.002）的估计表明大气边界层中存在混沌。我们的研究结果表明，这种低维混沌动力学与树冠顶部上方边界层内相干结构的存在有关，而不是像之前所声称的那样与大气湍流本身有关。