Electrical conductivity of the suboceanic upper mantle constrained by satellite-derived tidal magnetic fields: three-dimensional inversion, validation and interpretation
SUMMARY We present the first 3-D upper-mantle conductivity models obtained by an inversion of the satellite-derived tidally induced magnetic fields (TIMFs). We primarily use the M$_2$ period, but the potential benefit of the O$_1$ period is also inspected. The inverse-problem solution is found using...
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Veröffentlicht in: | Geophysical journal international 2024-07, Vol.238 (3), p.1254-1268 |
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creator | Šachl, L Knopp, O Velímský, J |
description | SUMMARY
We present the first 3-D upper-mantle conductivity models obtained by an inversion of the satellite-derived tidally induced magnetic fields (TIMFs). We primarily use the M$_2$ period, but the potential benefit of the O$_1$ period is also inspected. The inverse-problem solution is found using the recently developed frequency-domain, spherical harmonic finite-element method based on the adjoint approach. We tested two different TIMF data sets derived from the satellite measurements of the Swarm mission and two different regularizations; the solution is either required to be sufficiently smooth or reasonably close to the a priori 3-D conductivity model WINTERC-e Wd-emax. The reconstructed conductivity models are locally compared with the 1-D conductivity profiles from other studies. If we use one of the available TIMF data sets, the smooth reconstructed model gravitates towards Wd-emax and the TIMF-adjusted Wd-emax model is closer to the reference conductivity profiles than the original Wd-emax model. Finally, we use the obtained 3-D conductivity distributions to calculate the corresponding 3-D water distribution in the upper mantle using thermodynamical and compositional models coupled to the electrical-conductivity laboratory measurement of individual mantle constituents. |
doi_str_mv | 10.1093/gji/ggae209 |
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We present the first 3-D upper-mantle conductivity models obtained by an inversion of the satellite-derived tidally induced magnetic fields (TIMFs). We primarily use the M$_2$ period, but the potential benefit of the O$_1$ period is also inspected. The inverse-problem solution is found using the recently developed frequency-domain, spherical harmonic finite-element method based on the adjoint approach. We tested two different TIMF data sets derived from the satellite measurements of the Swarm mission and two different regularizations; the solution is either required to be sufficiently smooth or reasonably close to the a priori 3-D conductivity model WINTERC-e Wd-emax. The reconstructed conductivity models are locally compared with the 1-D conductivity profiles from other studies. If we use one of the available TIMF data sets, the smooth reconstructed model gravitates towards Wd-emax and the TIMF-adjusted Wd-emax model is closer to the reference conductivity profiles than the original Wd-emax model. Finally, we use the obtained 3-D conductivity distributions to calculate the corresponding 3-D water distribution in the upper mantle using thermodynamical and compositional models coupled to the electrical-conductivity laboratory measurement of individual mantle constituents.</description><identifier>ISSN: 0956-540X</identifier><identifier>EISSN: 1365-246X</identifier><identifier>DOI: 10.1093/gji/ggae209</identifier><language>eng</language><publisher>Oxford University Press</publisher><ispartof>Geophysical journal international, 2024-07, Vol.238 (3), p.1254-1268</ispartof><rights>The Author(s) 2024. Published by Oxford University Press on behalf of The Royal Astronomical Society. 2024</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c189t-3c1d98451826bb546b750d05a73cb63ad0f26df74ef3633f3881b8095aecff023</cites><orcidid>0000-0003-3281-3877</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,864,1604,27924,27925</link.rule.ids></links><search><creatorcontrib>Šachl, L</creatorcontrib><creatorcontrib>Knopp, O</creatorcontrib><creatorcontrib>Velímský, J</creatorcontrib><title>Electrical conductivity of the suboceanic upper mantle constrained by satellite-derived tidal magnetic fields: three-dimensional inversion, validation and interpretation</title><title>Geophysical journal international</title><description>SUMMARY
We present the first 3-D upper-mantle conductivity models obtained by an inversion of the satellite-derived tidally induced magnetic fields (TIMFs). We primarily use the M$_2$ period, but the potential benefit of the O$_1$ period is also inspected. The inverse-problem solution is found using the recently developed frequency-domain, spherical harmonic finite-element method based on the adjoint approach. We tested two different TIMF data sets derived from the satellite measurements of the Swarm mission and two different regularizations; the solution is either required to be sufficiently smooth or reasonably close to the a priori 3-D conductivity model WINTERC-e Wd-emax. The reconstructed conductivity models are locally compared with the 1-D conductivity profiles from other studies. If we use one of the available TIMF data sets, the smooth reconstructed model gravitates towards Wd-emax and the TIMF-adjusted Wd-emax model is closer to the reference conductivity profiles than the original Wd-emax model. Finally, we use the obtained 3-D conductivity distributions to calculate the corresponding 3-D water distribution in the upper mantle using thermodynamical and compositional models coupled to the electrical-conductivity laboratory measurement of individual mantle constituents.</description><issn>0956-540X</issn><issn>1365-246X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><sourceid>TOX</sourceid><recordid>eNp9kL1OwzAUhS0EEqUw8QKeWCDUjhM3YUNV-ZEqsYDULXLs6-AqcSLbidRH4i1xaWeme3Tud85wELql5JGSki2anVk0jYCUlGdoRhnPkzTj23M0I2XOkzwj20t05f2OEJrRrJihn3ULMjgjRYtlb9Uog5lM2ONe4_AN2I91L0FYI_E4DOBwJ2xo4cD64ISxoHC9x14EaFsTIFHgzBTNYFSs7ERjIcSwNtAq_xQ7HUTIdGC96W1EjJ3AHfQDnkQbUyFqLKyKnwBucBD-rGt0oUXr4eZ05-jrZf25eks2H6_vq-dNImlRhoRJqsoiy2mR8rrOM14vc6JILpZM1pwJRXTKlV5moBlnTLOioHUR5xEgtSYpm6P7Y690vfcOdDU40wm3ryipDitXceXqtHKk7450Pw7_gr-OVYR0</recordid><startdate>20240711</startdate><enddate>20240711</enddate><creator>Šachl, L</creator><creator>Knopp, O</creator><creator>Velímský, J</creator><general>Oxford University Press</general><scope>TOX</scope><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0003-3281-3877</orcidid></search><sort><creationdate>20240711</creationdate><title>Electrical conductivity of the suboceanic upper mantle constrained by satellite-derived tidal magnetic fields: three-dimensional inversion, validation and interpretation</title><author>Šachl, L ; Knopp, O ; Velímský, J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c189t-3c1d98451826bb546b750d05a73cb63ad0f26df74ef3633f3881b8095aecff023</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Šachl, L</creatorcontrib><creatorcontrib>Knopp, O</creatorcontrib><creatorcontrib>Velímský, J</creatorcontrib><collection>OUP_牛津大学出版社OA刊</collection><collection>CrossRef</collection><jtitle>Geophysical journal international</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Šachl, L</au><au>Knopp, O</au><au>Velímský, J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Electrical conductivity of the suboceanic upper mantle constrained by satellite-derived tidal magnetic fields: three-dimensional inversion, validation and interpretation</atitle><jtitle>Geophysical journal international</jtitle><date>2024-07-11</date><risdate>2024</risdate><volume>238</volume><issue>3</issue><spage>1254</spage><epage>1268</epage><pages>1254-1268</pages><issn>0956-540X</issn><eissn>1365-246X</eissn><abstract>SUMMARY
We present the first 3-D upper-mantle conductivity models obtained by an inversion of the satellite-derived tidally induced magnetic fields (TIMFs). We primarily use the M$_2$ period, but the potential benefit of the O$_1$ period is also inspected. The inverse-problem solution is found using the recently developed frequency-domain, spherical harmonic finite-element method based on the adjoint approach. We tested two different TIMF data sets derived from the satellite measurements of the Swarm mission and two different regularizations; the solution is either required to be sufficiently smooth or reasonably close to the a priori 3-D conductivity model WINTERC-e Wd-emax. The reconstructed conductivity models are locally compared with the 1-D conductivity profiles from other studies. If we use one of the available TIMF data sets, the smooth reconstructed model gravitates towards Wd-emax and the TIMF-adjusted Wd-emax model is closer to the reference conductivity profiles than the original Wd-emax model. Finally, we use the obtained 3-D conductivity distributions to calculate the corresponding 3-D water distribution in the upper mantle using thermodynamical and compositional models coupled to the electrical-conductivity laboratory measurement of individual mantle constituents.</abstract><pub>Oxford University Press</pub><doi>10.1093/gji/ggae209</doi><tpages>15</tpages><orcidid>https://orcid.org/0000-0003-3281-3877</orcidid><oa>free_for_read</oa></addata></record> |
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title | Electrical conductivity of the suboceanic upper mantle constrained by satellite-derived tidal magnetic fields: three-dimensional inversion, validation and interpretation |
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