基于随温度变化的热系数模拟板块俯冲动力学过程

热传导系数和热膨胀系数是影响板块俯冲动力学过程的两个重要参数. 由于地球介质的不均匀性，热系数也会随深度发生变化.然而，这种变化在地球动力学模拟研究中往往被忽略.本文针对随温度变化的热传导系数和热膨胀系数， 模拟板块俯冲的动力学过程，分析热系数、黏度对板块俯冲形态的影响及其对应的地幔对流特征.结果表明，依温度变化的热传导系数和热膨胀系数会影响地幔温度及黏度分布，进而改变板块的俯冲角度；黏度是控制板块俯冲动力学演化过程的重要因素；地幔对流受黏度结构的影响，呈现分层对流及局部多个对流环等多种不同形态的对流场特征. 

Modeling the dynamic process of slab subduction based on temperature-dependent thermal coefficients

The thermal conductivity and expansion coefficients are two significant parameters that have influence on the dynamic process of slab subduction. Due to the heterogeneity of Earth medium, these two coefficients are usually variable with depth. Unfortunately, such variations are often ignored in current modeling studies of geodynamics. The present study refers to the temperature-dependent thermal conductivity and expansion to simulate the dynamic process of slab subduction. The impact of thermal parameters and viscosity on slab geometry and the corresponding characteristics of mantle convection are analyzed. The modeling results show that the temperature-dependent thermal conductivity and expansion affect the subduction angle by changing the thermal and viscosity structure. The viscosity plays a critical role in controlling the slab dynamic evolution. The mantle convection is affected by viscosity structure and exhibits different patterns, such as layered convection and local multiple convection loops, etc.