SCALING LAWS IN A TURBULENT BAROCLINIC INSTABILITY

被引:6
作者
SERIO, C
TRAMUTOLI, V
机构
来源
FRACTALS-AN INTERDISCIPLINARY JOURNAL ON THE COMPLEX GEOMETRY OF NATURE | 1995年 / 3卷 / 02期
关键词
D O I
10.1142/S0218348X95000242
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
This work provides an empirical investigation of scaling laws in a cloud system generated and advected by a strong baroclinic instability. An infrared satellite image with a spatial (horizontal) resolution of about 1 km has been analyzed. The presence of two sizeable and unmistakable scaling regions, one extending from 1 to 15 km and characterized by a power law with an exponent close to 1, the other stretching from 20 km up to 100 km and characterized by a power law with exponent close to 1/3, have been revealed by variogram analysis. These two scaling laws are in agreement with the idea of scale invariance of the turbulent motion and also suggest the presence of a self-similar structure. To explore this possibility, wavelet transform analysis at different spatial scales has been used. Our findings are that self-similarity is present at the smallest scales, but this universal characteristic may be masked by non-universal effects which influence the homogeneity of the underlying turbulent motion. The implications of the two scaling exponents, 1 and 1/3, are also discussed.
引用
收藏
页码:297 / 314
页数:18
相关论文
共 27 条
[1]  
ARGOUL F, 1989, PHYS LETT A, V125, P327
[2]  
Arneodo A., 1989, NONLINEAR DYNAMICS
[3]   LARGE-SCALE PERCOLATION AND DIFFUSION IN TURBULENT STRATOSPHERE [J].
BERSHADSKII, A .
PHYSICA A, 1994, 206 (1-2) :120-126
[4]  
CHARNEY JG, 1947, J METEOROL, V4, P135
[5]  
Chorin A.J., 1994, VORTICITY TURBULENCE
[6]  
CRESSIE NAC, 1993, STATISTICS SPATIAL D
[7]  
EADY ET, 1949, TELLUS, V1, P33
[8]   WAVELET ANALYSIS OF THE TURBULENT JET [J].
EVERSON, R ;
SIROVICH, L ;
SREENIVASAN, KR .
PHYSICS LETTERS A, 1990, 145 (6-7) :314-322
[9]  
FRISCH U, 1991, TURBULENT STOCHASTIC
[10]   A PROBLEM IN BAROCLINIC STABILITY [J].
GREEN, JSA .
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, 1960, 86 (368) :237-251