Article (Scientific journals)
Statistical derivation of the evolution equation of liquid water path fluctuations in clouds
Ivanova, K.; Ausloos, Marcel
2002In Journal of Geophysical Research. Atmospheres, 107 (D23)
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Keywords :
liquid water path; Fokker-Planck equation; statistical derivation; fluctuations
Abstract :
[en] [1] How to distinguish and quantify deterministic and random influences on the statistics of turbulence data in meteorology cases is discussed from first principles. Liquid water path (LWP) changes in clouds, as retrieved from radio signals, upon different delay times, can be regarded as a stochastic Markov process. A detrended fluctuation analysis method indicates the existence of long range time correlations. The Fokker-Planck equation which models very precisely the LWP fluctuation empirical probability distributions, in particular, their non-Gaussian heavy tails is explicitly derived and written in terms of a drift and a diffusion coefficient. Furthermore, Kramers-Moyal coefficients, as estimated from the empirical data, are found to be in good agreement with their first principle derivation. Finally, the equivalent Langevin equation is written for the LWP increments themselves. Thus rather than the existence of hierarchical structures, like an energy cascade process, strong correlations on different timescales, from small to large ones, are considered to be proven as intrinsic ingredients of such cloud evolutions.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Ivanova, K.
Ausloos, Marcel ;  Université de Liège - ULiège > Département de physique > Physique statistique appliquée et des matériaux
Language :
English
Title :
Statistical derivation of the evolution equation of liquid water path fluctuations in clouds
Publication date :
11 December 2002
Journal title :
Journal of Geophysical Research. Atmospheres
ISSN :
2169-897X
eISSN :
2169-8996
Publisher :
Amer Geophysical Union, Washington, United States - Washington
Volume :
107
Issue :
D23
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 April 2011

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