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- Publisher Website: 10.1002/grl.50574
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Article: Implications of high core thermal conductivity on Earth's coupled mantle and core evolution
Title | Implications of high core thermal conductivity on Earth's coupled mantle and core evolution |
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Authors | |
Keywords | magnetic dissipation mantle convection thermal conductivity compositional convection CMB heat flow |
Issue Date | 2013 |
Citation | Geophysical Research Letters, 2013, v. 40, n. 11, p. 2652-2656 How to Cite? |
Abstract | We assess the effect of high thermal conductivity of Earth's core, which was recently determined to be 2-3 times higher than previously thought, on Earth's thermochemical-magnetic evolution using a coupled model of simulated mantle convection and parameterized core heat balance, following the best fit case of Nakagawa and Tackley (2010). The value of core thermal conductivity has no effect on mantle evolution. The core-mantle boundary heat flow starts high and decreases with time to ∼13 TW, which is below the core adiabatic heat flux for the largest thermal conductivity tested (200 W/m/K), meaning that a purely thermal dynamo is not viable. However, gravitational energy release and latent heat associated with inner core growth become important in the last ∼0.9 Gyr and allow continuous geodynamo generation despite high core thermal conductivity, although we estimate a subadiabatic region at the top of the core of the order of hundreds of kilometers. © 2013 American Geophysical Union. All Rights Reserved. |
Persistent Identifier | http://hdl.handle.net/10722/264932 |
ISSN | 2023 Impact Factor: 4.6 2023 SCImago Journal Rankings: 1.850 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Nakagawa, Takashi | - |
dc.contributor.author | Tackley, Paul J. | - |
dc.date.accessioned | 2018-11-08T01:35:20Z | - |
dc.date.available | 2018-11-08T01:35:20Z | - |
dc.date.issued | 2013 | - |
dc.identifier.citation | Geophysical Research Letters, 2013, v. 40, n. 11, p. 2652-2656 | - |
dc.identifier.issn | 0094-8276 | - |
dc.identifier.uri | http://hdl.handle.net/10722/264932 | - |
dc.description.abstract | We assess the effect of high thermal conductivity of Earth's core, which was recently determined to be 2-3 times higher than previously thought, on Earth's thermochemical-magnetic evolution using a coupled model of simulated mantle convection and parameterized core heat balance, following the best fit case of Nakagawa and Tackley (2010). The value of core thermal conductivity has no effect on mantle evolution. The core-mantle boundary heat flow starts high and decreases with time to ∼13 TW, which is below the core adiabatic heat flux for the largest thermal conductivity tested (200 W/m/K), meaning that a purely thermal dynamo is not viable. However, gravitational energy release and latent heat associated with inner core growth become important in the last ∼0.9 Gyr and allow continuous geodynamo generation despite high core thermal conductivity, although we estimate a subadiabatic region at the top of the core of the order of hundreds of kilometers. © 2013 American Geophysical Union. All Rights Reserved. | - |
dc.language | eng | - |
dc.relation.ispartof | Geophysical Research Letters | - |
dc.subject | magnetic dissipation | - |
dc.subject | mantle convection | - |
dc.subject | thermal conductivity | - |
dc.subject | compositional convection | - |
dc.subject | CMB heat flow | - |
dc.title | Implications of high core thermal conductivity on Earth's coupled mantle and core evolution | - |
dc.type | Article | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1002/grl.50574 | - |
dc.identifier.scopus | eid_2-s2.0-84879963554 | - |
dc.identifier.volume | 40 | - |
dc.identifier.issue | 11 | - |
dc.identifier.spage | 2652 | - |
dc.identifier.epage | 2656 | - |
dc.identifier.eissn | 1944-8007 | - |
dc.identifier.isi | WOS:000321261600032 | - |
dc.identifier.issnl | 0094-8276 | - |