Magnetic tidal signals in the southern Indian Ocean ...

• Main Author: Wardinski, Ingo
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Antarctic; Indian; Kerguelen; Amsterdam Island; Antarc*
• Online Access: https://dx.doi.org/10.57757/iugg23-3935; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019898

<!--!introduction!--> 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 ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...