Earth-prints repository, logo   DSpace

About DSpace Software
|earth-prints home page | roma library | bologna library | catania library | milano library | napoli library | palermo library
Please use this identifier to cite or link to this item:

Authors: Spada, G.*
Galassi, G.*
Olivieri, M.*
Title: Empirical mode decomposition of long-term polar motion observation
Title of journal: Studia Geophysica et Geodaetica
Series/Report no.: /59(2015)
Publisher: Plenum Press
Issue Date: 2015
DOI: 10.1007/s11200-014-1151-4
Keywords: secular polar motion
markowitz wobble
Abstract: We use the Empirical Mode Decomposition (EMD) method to study the decadal variations in polar motion and its long-term trend since year 1900. The existence of the so-called “Markowitz wobble”, a multidecadal fluctuation of the mean pole of rotation whose nature has long been debated since its discovery in 1960, is confirmed. In the EMD approach, the Markowitz wobble naturally arises as an empirical oscillatory term in polar motion, showing significant amplitude variations and a period of approximately 3 decades. The path of the time-averaged, non-cyclic component of polar motion matches the results of previous investigations based on classical spectral methods. However, our analysis also reveals previously unnoticed steep variations (change points) in the rate and the direction of secular polar motion.
Appears in Collections:04.03.02. Earth rotation
Papers Published / Papers in press

Files in This Item:

File SizeFormatVisibility
Empirical_Polar_Motion_Spada_Galassi_Olivieri.pdf1.84 MBAdobe PDFNot available View/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Share this record




Stumble it!



Valid XHTML 1.0! ICT Support, development & maintenance are provided by CINECA. Powered on DSpace Software. CINECA