The depth to the Curie isotherm provides a snapshot into the deep thermal conditions of the crust, which helps constrain models of thermally controlled physical properties and processes. In this study, we present an updated global Curie depth model by employing the equivalent source dipole method to fit the lithospheric magnetic field model LCS-1 from spherical harmonic degree 16 to 100. In addition to the new field mode, we utilise all three vector components and include a laterally variable magnetic susceptibility model. We also employ an improved thermal model, TC1, to supplement the degree 1 to 15 components that are otherwise contaminated by the core field. Our new Curie depth model differs by as much as ±20 km relative to previous models, with the largest differences arising from the low order thermal model and variable susceptibility. Key differences are found in central Africa due to application of a variable susceptibility model, and shield regions, but continents with poor constraints such as Antarctica require additional improvement. This new Curie depth model shows good agreement with continental heat flow observations, and provides further evidence that Curie depth estimates may be used to constrain evaluations of the thermal state of the continental lithosphere, especially in regions with sparse or surface contaminated heat flow observations.

居里等温线的深度提供了地壳深部热条件的快照，这有助于约束热控制物理特性和过程的模型。在这项研究中，我们通过采用等效源偶极子方法来拟合从球谐度16到100的岩石圈磁场模型LCS-1，从而提供了一个更新的全局居里深度模型。除了新的场模式之外，我们还利用了所有三个矢量组件，并包括横向可变的磁化率模型。我们还采用了改进的热模型TC1，以补充1至15级的组件，这些组件否则会被堆芯场污染。与以前的模型相比，我们的新居里深度模型相差多达±20 km，其中最大的差异来自低阶热模型和可变磁化率。在非洲中部，由于采用了可变的磁化率模型和盾构区域，因此存在关键差异，但是，南极等约束条件较差的大陆需要进一步改善。这种新的居里深度模型与大陆热流观测值显示出良好的一致性，并提供了进一步的证据，表明居里深度估计可用于限制对大陆岩石圈热状态的评估，尤其是在稀疏或受表面污染的热流观测区域。