Trampert Jeannot, Deschamps Frédéric, Resovsky Joseph, Yuen Dave
Department of Earth Sciences, Utrecht University, Post Office Box 80021, 3508 TA Utrecht, Netherlands.
Science. 2004 Oct 29;306(5697):853-6. doi: 10.1126/science.1101996.
We obtained likelihoods in the lower mantle for long-wavelength models of bulk sound and shear wave speed, density, and boundary topography, compatible with gravity constraints, from normal mode splitting functions and surface wave data. Taking into account the large uncertainties in Earth's thermodynamic reference state and the published range of mineral physics data, we converted the tomographic likelihoods into probability density functions for temperature, perovskite, and iron variations. Temperature and composition can be separated, showing that chemical variations contribute to the overall buoyancy and are dominant in the lower 1000 kilometers of the mantle.
我们从简正模式分裂函数和表面波数据中，获得了下地幔中与重力约束兼容的体声速、剪切波速度、密度和边界地形长波长模型的似然性。考虑到地球热力学参考状态的巨大不确定性以及已发表的矿物物理数据范围，我们将层析成像似然性转换为温度、钙钛矿和铁变化的概率密度函数。温度和成分可以分离，这表明化学变化对整体浮力有贡献，并且在地幔下部1000公里处占主导地位。
