Open AccessEffects of inter‐annual water storage variations on polar motion
Author(s) -
Fernández L. I.,
Schuh H.,
Schmidt M.,
Seitz F.
Publication year - 2007
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.2006.03304.x
Subject(s) - polar motion , geodetic datum , polar , geology , excitation , geodesy , wavelet , series (stratigraphy) , residual , distortion (music) , environmental science , physics , earth's rotation , mathematics , paleontology , amplifier , optoelectronics , cmos , algorithm , quantum mechanics , astronomy , artificial intelligence , computer science
SUMMARY This paper focuses on the contribution of inter‐annual hydrological mass redistributions to the excitation of polar motion. Variations in hydrological angular momenta are computed from the Land Dynamics Model (LaD) for the period between 1986 January and 2004 May. For validation, the numerical results for the hydrological excitations are compared with respective time‐series derived from geodetic observations. In order to provide a comparable reference, the latter are reduced by atmospheric and oceanic effects which are the prominent contributors to polar motion excitation on subdiurnal to decadal timescales. Both the hydrological and the geodetic excitation series are low‐pass filtered by means of a Vondrák filter in order to remove the dominant annual oscillations. For the comparison of hydrological and geodetic excitations, wavelet scalograms and cross‐scalograms along with the respective normed coherency are computed. Analyses reveal that the hydrological mass redistributions deduced from LaD contribute to polar motion excitation at retrograde periods around 4 yr, although the signal energy is smaller in the hydrological excitations than that in the residual geodetic excitations.