10.35099/AURORA-405
Tang, Xiaoli
Ntam, Moses C.
Dong, Jianjun
Rainey, Emma S. G.
Kavner, Abby
The thermal conductivity of Earth's lower mantle
American Geophysical Union
2014
Auburn University
Auburn University
Jianjun Dong, dongjia@auburn.edu
2022-09-16
2022-09-16
2014
Journal Article, Academic Journal
https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2014GL059385
https://aurora.auburn.edu/handle/11200/50337
PDF
©American Geophysical Union 2014. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Tang, X., Ntam, M. C., Dong, J., Rainey, E. S., & Kavner, A. (2014). The thermal conductivity of Earth's lower mantle. Geophysical Research Letters, 41(8), 2746-2752.
We assess the thermal conductivity of the Earth’s lower mantle anchored on our first-principles calculations of lattice thermal conductivity of MgSiO3 perovskite. Our calculations agree with measurements of iron-free perovskite at ambient conditions and show a lower pressure dependence compared with other recent calculations. In addition, we show that the effect of iron on the lattice thermal conductivity of silicate perovskite is likely to be small at high temperatures. To provide an assessment of thermal conductivity throughout the lower mantle, we reevaluate existing high-pressure optical absorption data to constrain an upper bound radiative contribution to diffusive heat transfer and examine a composite model for combining thermal conductivity of oxide and perovskite phases in the lower mantle. We find that the overall thermal conductivity of the lower mantle is approximately constant between 2.5 and 3.5 W/m/K. These values imply that the mantle has a blanketing effect on heat flow across the core-mantle boundary.