Geophysical excitation of LOD/UT1 estimated from the output of the global 
circulation models of the atmosphere - ERA-40 reanalysis and of the ocean - OMCT

Korbacz, A.; Brzezinski, A.; Thomas, Maik; 1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum

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Geophysical excitation of LOD/UT1 estimated from the output of the global circulation models of the atmosphere - ERA-40 reanalysis and of the ocean - OMCT

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Korbacz, A.
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Brzezinski, A.
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Thomas, Maik
Deutsches GeoForschungsZentrum;

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Korbacz, A., Brzezinski, A., Thomas, M. (2008): Geophysical excitation of LOD/UT1 estimated from the output of the global circulation models of the atmosphere - ERA-40 reanalysis and of the ocean - OMCT. - In: Capitaine, N. (Ed.), Proceedings of the 'Journées Systèmes de Référence Spatio-temporels 2007', Observatoire de Paris, 188-191.

https://gfzpublic.gfz-potsdam.de/pubman/item/item_245418

Abstract

We use new estimates of the global atmospheric and oceanic angular momenta (AAM, OAM) to study the influence on LOD/UT1. The AAM series was calculated from the output fields of the atmospheric general circulation model ERA-40 reanalysis. The OAM series is an outcome of global ocean model OMCT simulation driven by global fields of the atmospheric parameters from the ERA- 40 reanalysis. The excitation data cover the period between 1963 and 2001. Our calculations concern atmospheric and oceanic effects in LOD/UT1 over the periods between 20 days and decades. Results are compared to those derived from the alternative AAM/OAM data sets. 1.