Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pepi..128..195n&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 128, Issue 1-4, p. 195-205.
Physics
2
Scientific paper
The lateral variations in the thickness of the D/'' layer observed by recent global seismology are suspected to control mantle dynamics. performed laboratory experiments to explore how undulations of various sizes in the D/'' layer affect convection patterns. In addition, we found that the undulation at the lower boundary can induce plumes and that there is a critical height above which the undulation controls convection patterns. Observed undulations at the top of the D/'' layer exceed this critical height, suggesting that they may control the mantle convection patterns. The previous work, however, assumed basal heating. Since internal heating is an important source which drives mantle convection, we extend our previous study to a case incorporating internal heat sources using laboratory experiments. Internal heat generation is simulated by lowering the boundary temperatures at a constant rate. We observed that the undulation, which has the comparable thickness to the critical height determined in the purely basal heating case, can fix the location of the upwelling although the magnitude of the intensity of the upwelling is weaker. This situation is similar to the Earth's hotspots and suggests that the undulation at the top of the D/'' layer is the source region of the hotspots.
Kurita Kazuyoshi
Namiki Atsuko
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