Other
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008e%26psl.271..348n&link_type=abstract
Earth and Planetary Science Letters, Volume 271, Issue 1-4, p. 348-358.
Other
20
Scientific paper
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 Vs above 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 qCMB relationship is reasonably but not perfectly linear. The post-perovskite transition introduces a non-linearity that amplifies fast Vs anomalies in cold regions, but there is still a unique mapping between δVs and 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 qCMB if the dense material (e.g., MORB) is seismically fast compared to the surrounding material. In this case, dense piles are ringed by sharp, low-Vs anomalies. If the CMB is covered by a global dense layer than variations in δVs and qCMB are reduced but so is the mean value of qCMB. In all cases, the peak-to-peak lateral variation in qCMB is 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.
Nakagawa Takashi
Tackley Paul J.
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