Non-adiabaticity in mantle convection

被引：48

作者：

Bunge, HP

Ricard, Y

Matas, J

机构：

[1] Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA

[2] Ecole Normale Super Lyon, Dept Sci Terre, F-69364 Lyon 07, France

[3] Univ Calif Berkeley, Dept Geol & Geophys, Berkeley, CA 94720 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2001年 / 28卷 / 05期

关键词：

D O I：

10.1029/2000GL011864

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Seismic observations indicate that Earth's lower mantle is homogeneous as revealed by smooth depth variations of the bulk sound velocity and Bullen's inhomogeneity parameter eta being close to one. Here we show with 3D spherical convection simulations that it should also be non-adiabatic because a significant proportion of mantle heat sources is internal. The computer simulations predict non-adiabaticity of 100-300 degrees for the lower mantle geotherm, with eta similar to 1.01 implying that the temperature drop across the Core Mantle Boundary exceeds 1000 degrees.

引用

页码：879 / 882

页数：4

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