Empirical mode decomposition analysis of climate changes with special reference to rainfall data

Molla, Md. Khademul Islam; Rahman, M. Sayedur; Sumi, Akimasa; Banik, Pabitra

doi:https://doi.org/10.1155/DDNS/2006/45348

Discrete Dynamics in Nature and Society

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Volume 2006 | Article ID 045348 | https://doi.org/10.1155/DDNS/2006/45348

Empirical mode decomposition analysis of climate changes with special reference to rainfall data

Md. Khademul Islam Molla,¹M. Sayedur Rahman,²Akimasa Sumi,²and Pabitra Banik³

Received27 Jul 2005

Accepted06 Nov 2005

Published11 May 2006

Abstract

We have used empirical mode decomposition (EMD) method, which is especially well fitted for analyzing time-series data representing nonstationary and nonlinear processes. This method could decompose any time-varying data into a finite set of functions called “intrinsic mode functions” (IMFs). The EMD analysis successively extracts the IMFs with the highest local temporal frequencies in a recursive way. The extracted IMFs represent a set of successive low-pass spatial filters based entirely on the properties exhibited by the data. The IMFs are mutually orthogonal and more effective in isolating physical processes of various time scales. The results showed that most of the IMFs have normal distribution. Therefore, the energy density distribution of IMF samples satisfies χ2-distribution which is statistically significant. This study suggested that the recent global warming along with decadal climate variability contributes not only to the more extreme warm events, but also to more frequent, long lasting drought and flood.

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Copyright

Copyright © 2006 Md. Khademul Islam Molla et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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