File Download
There are no files associated with this item.
Links for fulltext
(May Require Subscription)
- Publisher Website: 10.1016/j.epsl.2008.04.013
- Scopus: eid_2-s2.0-45049084089
- WOS: WOS:000257835600034
- Find via
Supplementary
- Citations:
- Appears in Collections:
Article: Lateral variations in CMB heat flux and deep mantle seismic velocity caused by a thermal-chemical-phase boundary layer in 3D spherical convection
Title | Lateral variations in CMB heat flux and deep mantle seismic velocity caused by a thermal-chemical-phase boundary layer in 3D spherical convection |
---|---|
Authors | |
Keywords | lateral heterogeneities CMB heat flow 3D spherical shell seismic anomalies thermo-chemical mantle convection |
Issue Date | 2008 |
Citation | Earth and Planetary Science Letters, 2008, v. 271, n. 1-4, p. 348-358 How to Cite? |
Abstract | Numerical simulations of thermo-chemical, multi-phase, compressible mantle convection in a three-dimensional spherical shell are used to investigate the relationship between lateral variations in seismic shear-wave velocity Vsabove the core-mantle boundary (CMB) and lateral variations in heat flux across the CMB (qCMB), when compositional variations and the post-perovskite phase transition are included. For simple thermal convection, the Vs-qCMBrelationship is reasonably but not perfectly linear. The post-perovskite transition introduces a non-linearity that amplifies fast Vsanomalies in cold regions, but there is still a unique mapping between δVsand qCMB. Lateral variations in composition such as piles of dense material introduce another non-linearity that affects hot upwelling regions, and introduces a non-uniqueness in δVs-qCMBif the dense material (e.g., MORB) is seismically fast compared to the surrounding material. In this case, dense piles are ringed by sharp, low-Vsanomalies. If the CMB is covered by a global dense layer than variations in δVsand qCMBare reduced but so is the mean value of qCMB. In all cases, the peak-to-peak lateral variation in qCMBis similar to or larger than twice the mean value, which might create problems for generating a dynamo according to existing numerical dynamo simulations. Analytical scalings are developed to explain the observed trends. © 2008 Elsevier B.V. All rights reserved. |
Persistent Identifier | http://hdl.handle.net/10722/264902 |
ISSN | 2023 Impact Factor: 4.8 2023 SCImago Journal Rankings: 2.294 |
ISI Accession Number ID |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Nakagawa, Takashi | - |
dc.contributor.author | Tackley, Paul J. | - |
dc.date.accessioned | 2018-11-08T01:35:14Z | - |
dc.date.available | 2018-11-08T01:35:14Z | - |
dc.date.issued | 2008 | - |
dc.identifier.citation | Earth and Planetary Science Letters, 2008, v. 271, n. 1-4, p. 348-358 | - |
dc.identifier.issn | 0012-821X | - |
dc.identifier.uri | http://hdl.handle.net/10722/264902 | - |
dc.description.abstract | Numerical simulations of thermo-chemical, multi-phase, compressible mantle convection in a three-dimensional spherical shell are used to investigate the relationship between lateral variations in seismic shear-wave velocity Vsabove the core-mantle boundary (CMB) and lateral variations in heat flux across the CMB (qCMB), when compositional variations and the post-perovskite phase transition are included. For simple thermal convection, the Vs-qCMBrelationship is reasonably but not perfectly linear. The post-perovskite transition introduces a non-linearity that amplifies fast Vsanomalies in cold regions, but there is still a unique mapping between δVsand qCMB. Lateral variations in composition such as piles of dense material introduce another non-linearity that affects hot upwelling regions, and introduces a non-uniqueness in δVs-qCMBif the dense material (e.g., MORB) is seismically fast compared to the surrounding material. In this case, dense piles are ringed by sharp, low-Vsanomalies. If the CMB is covered by a global dense layer than variations in δVsand qCMBare reduced but so is the mean value of qCMB. In all cases, the peak-to-peak lateral variation in qCMBis similar to or larger than twice the mean value, which might create problems for generating a dynamo according to existing numerical dynamo simulations. Analytical scalings are developed to explain the observed trends. © 2008 Elsevier B.V. All rights reserved. | - |
dc.language | eng | - |
dc.relation.ispartof | Earth and Planetary Science Letters | - |
dc.subject | lateral heterogeneities | - |
dc.subject | CMB heat flow | - |
dc.subject | 3D spherical shell | - |
dc.subject | seismic anomalies | - |
dc.subject | thermo-chemical mantle convection | - |
dc.title | Lateral variations in CMB heat flux and deep mantle seismic velocity caused by a thermal-chemical-phase boundary layer in 3D spherical convection | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.epsl.2008.04.013 | - |
dc.identifier.scopus | eid_2-s2.0-45049084089 | - |
dc.identifier.volume | 271 | - |
dc.identifier.issue | 1-4 | - |
dc.identifier.spage | 348 | - |
dc.identifier.epage | 358 | - |
dc.identifier.isi | WOS:000257835600034 | - |
dc.identifier.issnl | 0012-821X | - |