Is the mantle geotherm subadiabatic?

Details Is the mantle geotherm subadiabatic? Is the mantle geotherm subadiabatic?

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..335j&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 335-338. NSF-supported research.

Mathematics

Logic

19

Earth Mantle, Geotemperature, Adiabatic Conditions, Heating, Temperature Distribution

Scientific paper

Internal heating and secular cooling are expected to decrease the geothermal gradient away from an adiabat. A scaling analysis that is quantified on the basis of published numerical models indicates that the interior geotherm should be nearly isothermal through the lower mantle if all heating is from within. For the more realistic condition that the mantle is partly heated from within and partly from below, the average thermal gradient is still expected to be significantly subadiabatic through much of the interior of the mantle. Values of the seismologically observable inhomogeneity parameter eta of about 1.04 to 1.07 should characterize the subadiabatic regions of the lower mantle.

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