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Evaluation of Empirical Mode Decomposition for Quantifying Multi-decadal Variations in Sea Level Records : Volume 1, Issue 2 (05/12/2014)

By Chambers, D. P.

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Book Id: WPLBN0004020084
Format Type: PDF Article :
File Size: Pages 22
Reproduction Date: 2015

Title: Evaluation of Empirical Mode Decomposition for Quantifying Multi-decadal Variations in Sea Level Records : Volume 1, Issue 2 (05/12/2014)  
Author: Chambers, D. P.
Volume: Vol. 1, Issue 2
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Chambers, D. P. (2014). Evaluation of Empirical Mode Decomposition for Quantifying Multi-decadal Variations in Sea Level Records : Volume 1, Issue 2 (05/12/2014). Retrieved from http://hawaiilibrary.net/


Description
Description: College of Marine Science, University of South Florida, St. Petersburg, FL, USA. The ability of empirical mode decomposition (EMD) to extract multidecadal variability from sea level records is tested using three simulations: one based on a series of purely sinusoidal modes, one based on scaled climate indices of El Niño and the Pacific Decadal Oscillation (PDO), and the final one including a single month with an extreme sea level event. All simulations include random noise of similar variance to high-frequency variability in the San Francisco tide gauge record. The intrinsic mode functions (IMFs) computed using EMD were compared to the prescribed oscillations. In all cases, the longest-period modes are significantly distorted, with incorrect amplitudes and phases. This affects the estimated acceleration computed from the longest periodic IMF. In these simulations, the acceleration was underestimated in the case with purely sinusoidal modes, and overestimated by nearly 100% in the case with prescribed climate modes. Additionally, in all cases, extra low-frequency modes uncorrelated with the prescribed variability are found. These experiments suggest that using EMD to identify multidecadal variability and accelerations in sea level records should be used with caution.

Summary
Evaluation of empirical mode decomposition for quantifying multi-decadal variations in sea level records

Excerpt
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