Effects of inter-annual water storage variations on polar motion

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 resul...

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Autores principales: Fernández, Laura Isabel, Schuh, Harald, Schmidt, Michael, Seitz, Florian
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Geofísica
Ciencias Exactas
hydrological excitation
polar motion
wavelet analysis
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/139181
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-139181
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geofísica
Ciencias Exactas
hydrological excitation
polar motion
wavelet analysis
spellingShingle Geofísica
Ciencias Exactas
hydrological excitation
polar motion
wavelet analysis
Fernández, Laura Isabel
Schuh, Harald
Schmidt, Michael
Seitz, Florian
Effects of inter-annual water storage variations on polar motion
topic_facet Geofísica
Ciencias Exactas
hydrological excitation
polar motion
wavelet analysis
description 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 Vondrak 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.
format Articulo
Articulo
author Fernández, Laura Isabel
Schuh, Harald
Schmidt, Michael
Seitz, Florian
author_facet Fernández, Laura Isabel
Schuh, Harald
Schmidt, Michael
Seitz, Florian
author_sort Fernández, Laura Isabel
title Effects of inter-annual water storage variations on polar motion
title_short Effects of inter-annual water storage variations on polar motion
title_full Effects of inter-annual water storage variations on polar motion
title_fullStr Effects of inter-annual water storage variations on polar motion
title_full_unstemmed Effects of inter-annual water storage variations on polar motion
title_sort effects of inter-annual water storage variations on polar motion
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/139181
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AT schuhharald effectsofinterannualwaterstoragevariationsonpolarmotion
AT schmidtmichael effectsofinterannualwaterstoragevariationsonpolarmotion
AT seitzflorian effectsofinterannualwaterstoragevariationsonpolarmotion
bdutipo_str Repositorios
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