Dynamic model of a coupled system of the convecting mantle, lithosphere and ice shield of Antarctica (MANTIS-II).

南极洲对流地幔、岩石圈和冰盾耦合系统的动力学模型（MANTIS-II）。

• 批准号: 273596845
• 负责人: Dr. Mikhail Kaban
• 金额: --
• 依托单位: Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum (GFZ)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/273596845?language=en
• 关键词: Dynamic; model; coupled; system; convecting

Evolution of the Antarctic ice cup is extremely important for the human habitat, since it is directly related to the sea-level variations. It has been demonstrated recently that its behavior is strongly influenced by thermal regime and dynamics of the lithosphere. However, Antarctica remains one of the least studied continents with respect to the crust and upper mantle structure. Therefore, it is very important to employ continuously improving satellite data in new integrative models. In the proposed study we are going to develop a dynamic model, which describes interaction of the convecting mantle, lithosphere and overlaying ice shield of Antarctica. This model will be based on integration of the satellite gravity, interferometry and magnetic data together with seismic tomography and other geophysical information. The integrative model of the Antarctic lithosphere and upper mantle, which is developed at the first stage of the project, forms a basis for dynamic modeling of the coupled system. This 3D model provides variations of temperature, rheology and density, which are the input parameters for numerical simulations of the dynamic interaction between the convecting mantle and lithosphere. We will use recently developed computer codes, which implement such important parameters as for example 3D variations of viscosity, which depends non-linearly on several factors. First, this model explains structure, evolution and stress state of the Antarctic lithosphere. In particularly, evolution of the lithospheric roots in East Antarctica and of the rift systems in West Antarctica will be highlighted. Second, the coupled mantle-lithosphere model refines surface heat output and vertical movements strongly influencing the Antarctic ice shield, which dynamic behavior will be modeled in the following part of the project. Using of these parameters makes a principal difference from previous works. Furthermore, employing of various satellite data, showing current ice velocities, provides a possibility to constrain model parameters. The constructed model will help to explain behavior of the ice shield and to predict its future development.

南极冰杯的演变与海平面的变化直接相关，对人类的生存至关重要。最近的研究表明，它的行为受到岩石圈热状况和动力学的强烈影响。然而，南极洲仍然是对地壳和上地幔结构研究最少的大陆之一。因此，在新的综合模式中采用不断改进的卫星数据是非常重要的。在这项研究中，我们将建立一个动力学模型，它描述了对流地幔，岩石圈和覆盖在南极洲冰盾的相互作用。该模型将以卫星重力、干涉测量和磁力数据与地震层析成像和其他地球物理信息的综合为基础。在项目第一阶段开发的南极岩石圈和上地幔综合模型为耦合系统的动力学模拟奠定了基础。该三维模型提供了对流地幔和岩石圈之间动力学相互作用的数值模拟的输入参数的温度，流变学和密度的变化。我们将使用最近开发的计算机代码，其实现诸如粘度的3D变化等重要参数，其非线性地依赖于若干因素。首先，该模型解释了南极岩石圈的结构、演化和应力状态。特别是，在东南极洲和西南极洲的裂谷系统的岩石圈根的演变将得到强调。其次，地幔-岩石圈耦合模型精确地描述了强烈影响南极冰盾的地表热量输出和垂直运动，其动力学行为将在项目的下一部分中模拟。这些参数的使用使得从以前的作品的主要区别。此外，采用各种卫星数据，显示当前的冰速度，提供了一种可能性，以约束模型参数。所建立的模型将有助于解释冰盾的行为，并预测其未来的发展。