On the modelling of M-2 tidal magnetic signatures: effects of physical approximations and numerical resolution
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10390329" target="_blank" >RIV/00216208:11320/18:10390329 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1186/s40623-018-0967-5" target="_blank" >https://doi.org/10.1186/s40623-018-0967-5</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1186/s40623-018-0967-5" target="_blank" >10.1186/s40623-018-0967-5</a>
Alternative languages
Result language
angličtina
Original language name
On the modelling of M-2 tidal magnetic signatures: effects of physical approximations and numerical resolution
Original language description
The magnetic signatures of ocean M 2 tides have been successfully detected by the low-orbit satellite missions CHAMP and Swarm. They have been also used to constrain the electrical conductivity in the uppermost regions of the Earth's mantle. Here, we concentrate on the problem of accurate numerical modelling of tidally induced magnetic field, using two different three-dimensional approaches: the contraction integral equation method and the spherical har - monic-finite element method. In particular, we discuss the effects of numerical resolution, self-induction, the galvanic and inductive coupling between the oceans and the underlying mantle. We also study the applicability of a simplified two-dimensional approximation, where the ocean is approximated by a single layer with vertically averaged conduc- tivity and tidal forcing. We demonstrate that the two-dimensional approach is sufficient to predict the large-scale tidal signals observable on the satellite altitude. However, for accurate predictions of M 2 tidal signals in the areas with significant variations of bathymetry, and close to the coastlines, full three-dimensional calculations are required. The ocean-mantle electromagnetic coupling has to be treated in the full complexity, including the toroidal magnetic field generated by the vertical currents flowing from and into the mantle.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10500 - Earth and related environmental sciences
Result continuities
Project
<a href="/en/project/GA17-03689S" target="_blank" >GA17-03689S: Ocean flows and their magnetic signatures on global and regional scales</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
EARTH PLANETS AND SPACE
ISSN
1880-5981
e-ISSN
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Volume of the periodical
70
Issue of the periodical within the volume
December
Country of publishing house
DE - GERMANY
Number of pages
15
Pages from-to
1-15
UT code for WoS article
000452855100002
EID of the result in the Scopus database
2-s2.0-85058846407