Magnetic tidal signals in the southern Indian Ocean
We analyze recordings of four geomagnetic observatories located in the French sub-antarctic and antarctic territories: Amsterdam Island (AMS), Crozet (CZT), Kerguelen (PAF), Durmont d'Urville (DRV). These recordings cover several decades of the geomagnetic field variation sampled every minute....
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5019898 2023-07-23T04:13:15+02:00 Magnetic tidal signals in the southern Indian Ocean Wardinski, I. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019898 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3935 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019898 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-3935 2023-07-02T23:40:07Z We analyze recordings of four geomagnetic observatories located in the French sub-antarctic and antarctic territories: Amsterdam Island (AMS), Crozet (CZT), Kerguelen (PAF), Durmont d'Urville (DRV). These recordings cover several decades of the geomagnetic field variation sampled every minute. We report results of a classical spectral analysis, where we estimate the spectral content of these series. Unlike previous studies, we attempt to identify the inter-annual variability of magnetic signals generated by Ocean tides, therefore we analyze monthly sets of the magnetic field recordings. We identify different tidal constituents, i.e. diurnal, semi-diurnal and short-periodic shallow water tides. Almost all show a long-term variability (seasonality) in their strength, particularly the shallow-water MK3 tide at Amsterdam Island (AMS), but also diurnal and semi-diurnal tides such as O1, K1 and M2. Causes of the long-term variability of shallow water tides and the diurnal and semi-diurnal tides might be different and may depend on different driving mechanisms i.e. wind forcing and the strength and shape of the Antarctic Circumpolar Current (ACC). We attempt to quantify these forcings and their variability throughout time. Conference Object Amsterdam Island Antarc* Antarctic GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic Indian Kerguelen The Antarctic |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
We analyze recordings of four geomagnetic observatories located in the French sub-antarctic and antarctic territories: Amsterdam Island (AMS), Crozet (CZT), Kerguelen (PAF), Durmont d'Urville (DRV). These recordings cover several decades of the geomagnetic field variation sampled every minute. We report results of a classical spectral analysis, where we estimate the spectral content of these series. Unlike previous studies, we attempt to identify the inter-annual variability of magnetic signals generated by Ocean tides, therefore we analyze monthly sets of the magnetic field recordings. We identify different tidal constituents, i.e. diurnal, semi-diurnal and short-periodic shallow water tides. Almost all show a long-term variability (seasonality) in their strength, particularly the shallow-water MK3 tide at Amsterdam Island (AMS), but also diurnal and semi-diurnal tides such as O1, K1 and M2. Causes of the long-term variability of shallow water tides and the diurnal and semi-diurnal tides might be different and may depend on different driving mechanisms i.e. wind forcing and the strength and shape of the Antarctic Circumpolar Current (ACC). We attempt to quantify these forcings and their variability throughout time. |
format |
Conference Object |
author |
Wardinski, I. |
spellingShingle |
Wardinski, I. Magnetic tidal signals in the southern Indian Ocean |
author_facet |
Wardinski, I. |
author_sort |
Wardinski, I. |
title |
Magnetic tidal signals in the southern Indian Ocean |
title_short |
Magnetic tidal signals in the southern Indian Ocean |
title_full |
Magnetic tidal signals in the southern Indian Ocean |
title_fullStr |
Magnetic tidal signals in the southern Indian Ocean |
title_full_unstemmed |
Magnetic tidal signals in the southern Indian Ocean |
title_sort |
magnetic tidal signals in the southern indian ocean |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019898 |
geographic |
Antarctic Indian Kerguelen The Antarctic |
geographic_facet |
Antarctic Indian Kerguelen The Antarctic |
genre |
Amsterdam Island Antarc* Antarctic |
genre_facet |
Amsterdam Island Antarc* Antarctic |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3935 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019898 |
op_doi |
https://doi.org/10.57757/IUGG23-3935 |
_version_ |
1772177792053542912 |