Minimum heat flow from the core and thermal evolution of the Earth

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10421620" target="_blank" >RIV/00216208:11320/20:10421620 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=LuD.nGqUaF" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=LuD.nGqUaF</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.pepi.2020.106457" target="_blank" >10.1016/j.pepi.2020.106457</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Minimum heat flow from the core and thermal evolution of the Earth

Popis výsledku v původním jazyce

The role of heat flow coming from the core is often overlooked or underestimated in simple models of Earths thermal evolution. Throughout most of Earth&apos;s history, the mantle must have been extracting from the core at least the amount of heat that is required to operate the geodynamo. In view of recent laboratory measurements and theoretical calculations indicating a higher thermal conductivity of iron than previously thought, the above constraint has important implications for the thermal history of the Earths mantle. In this work we construct a paramaterized mantle convection model that treats both the top and the core-mantle boundary heat fluxes according to the boundary layer theory, or alternatively employs the model of Labrosse (2015) to compute the thermal evolution of the Earths core. We show that the core is likely to provide all the missing heat that is necessary in order to avoid the so-called &quot;thermal catastrophe&quot; of the mantle. Moreover, by analyzing the mutual feedback between the core and the mantle, we provide the necessary ingredients for obtaining thermal histories that are consistent with the petrological record and have reasonable initial conditions. These include a sufficiently high viscosity contrast between the lower and upper mantle, whose exact value is sensitive to the activation energy that governs the temperature dependence of the viscosity.

Název v anglickém jazyce

Minimum heat flow from the core and thermal evolution of the Earth

Popis výsledku anglicky

The role of heat flow coming from the core is often overlooked or underestimated in simple models of Earths thermal evolution. Throughout most of Earth&apos;s history, the mantle must have been extracting from the core at least the amount of heat that is required to operate the geodynamo. In view of recent laboratory measurements and theoretical calculations indicating a higher thermal conductivity of iron than previously thought, the above constraint has important implications for the thermal history of the Earths mantle. In this work we construct a paramaterized mantle convection model that treats both the top and the core-mantle boundary heat fluxes according to the boundary layer theory, or alternatively employs the model of Labrosse (2015) to compute the thermal evolution of the Earths core. We show that the core is likely to provide all the missing heat that is necessary in order to avoid the so-called &quot;thermal catastrophe&quot; of the mantle. Moreover, by analyzing the mutual feedback between the core and the mantle, we provide the necessary ingredients for obtaining thermal histories that are consistent with the petrological record and have reasonable initial conditions. These include a sufficiently high viscosity contrast between the lower and upper mantle, whose exact value is sensitive to the activation energy that governs the temperature dependence of the viscosity.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

<a href="/cs/project/GA17-01464S" target="_blank" >GA17-01464S: Studium radiogenního zahřívání Země metodami částicové geofyziky: geoneutrina a vzácné plyny</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physics of the Earth and Planetary Interiors

ISSN

0031-9201

e-ISSN

—

Svazek periodika

305

Číslo periodika v rámci svazku

March

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

106457

Kód UT WoS článku

000537861300003

EID výsledku v databázi Scopus

2-s2.0-85085239703