Excitations of the Earth’s Chandler Wobble and Length Of Day by the Southern Ocean

Conference paper

Naghibi, E., Delizo-Salabit, C. and Karabasov, S. 2023. Excitations of the Earth’s Chandler Wobble and Length Of Day by the Southern Ocean. Journees 2023: Time and General Relativity. Nice, France 11 - 13 Sep 2023 Observatoire de la Cote D’Azur.
AuthorsNaghibi, E., Delizo-Salabit, C. and Karabasov, S.
TypeConference paper
Abstract

In this paper, the effect of Southern Ocean on Chandler wobble and length of day excitations is investigated. To this end, the motion terms of excitations are calculated using
the primitive equation ocean model, HYCOM (HYbrid Coordinate Ocean Model). The resulting excitations are analysed in time and frequency domains and compared to the previous studies for regional oceanic excitations of Chandler wobble and length of day. The excitations caused by the Southern Ocean are also compared with those caused by the global oceans in the same general circulation ocean model, HYCOM. Our results suggest that, amongst all oceanic regions, the Southern Ocean is a key contributor to both Chandler wobble and length of day excitations. The predicted excitations caused by the global oceans are also compared with geodetic observation of the Chandler wobble and length of day after subtraction of mass terms estimated from GRACE (Gravity Recovery and Climate Experiment) satellite gravimetry data.

Keywordspolar motion; length of day; Southern Ocean
Year2023
ConferenceJournees 2023: Time and General Relativity
PublisherObservatoire de la Cote D’Azur
Accepted author manuscript
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Anyone
Publication dates
Online01 Oct 2024
Publication process dates
Deposited13 Nov 2024
Journal citationpp. 25-32
Book titleTime and General Relativity: Journées 2023: Systèmes de Référence Spatio-Temporels Nice, 11-13 September
Book editorBizouard, C.
Fienga, A.
Paganelli, F.
ISBN 978-2-901057-74-1
Web address (URL) of conference proceedingshttps://syrte.obspm.fr/astro/journees2023/LATEX/JOURNEES2023.pdf
Copyright holder© 2023 The Authors
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