Determination of current geoid trends related to deep Earth processes in the South Atlantic region

确定与南大西洋地区地球深层过程相关的当前大地水准面趋势

• 批准号: 243973216
• 负责人: Professor Dr. Hans-Peter Bunge, Ph.D.
• 金额: --
• 依托单位: Lehrstuhl für Astronomische und Physikalische Geodäsie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/243973216?language=en
• 关键词: Determination; current; geoid; trends; related

We propose to link inferences of vertical motion in the South Atlantic region over a wide range of time scales, from geologic to geodetic, the latter represented by trend analyses of non-tidal, temporal variations in the gravity field derived from ultra-precise GRACE models. The southern part of Africa, in particular, is uniquely suited for this analysis, being a region with some of the most active mantle related dynamic uplift world-wide, with little contamination from hydrologic variability or other processes.The Institute for Astronomical and Physical Geodesy (IAPG) of TU München and the Geophysics Section of Ludwig-Maximilians-University (GS-LMU) are well positioned for this project, as IAPG has been working on satellite concepts for the high resolution modeling of the gravity field for many decades, and GS-LMU has pioneered high resolution global mantle circulation models capable of inferring past mantle flow and structure through sophisticated fluid inverse theory based on the adjoint method.Key questions we wish to address include:1) Can solid Earth related signals be separated in gravity solutions?2) Over which time periods may one rely on a linear interpolation of solid Earth related gravity trends?3) Is there ongoing vertical motion in the region and how does it relate to Cenozoic uplift pulses that have been inferred for the region from geologic observations?The use of the most sophisticated gravity processing techniques, combined with powerful, high resolution mantle circulation to represent non-linear convection signals will help us to distinguish end-member hypotheses on the effect that mantle convection may have in shaping the regional tectonic evolution, namely a dominance of quasi-steady, lower-mantle related flow or, alternatively, a prominence of pulsating, semi-episodic upper mantle flow.

我们建议连接在南大西洋地区的垂直运动的推断在很宽的时间尺度上，从地质到大地测量，后者代表的非潮汐的趋势分析，在重力场的时间变化来自超精确的GRACE模型。特别是非洲南部地区，是唯一适合进行这一分析的地区，该地区是世界上与地幔有关的动力隆升最活跃的地区，几乎没有水文变化或其他过程的污染。慕尼黑工业大学天文和物理大地测量研究所（IAPG）和路德维希-马克西米利安大学地球物理系（GS-LMU）为这一项目做好了充分的准备。由于IAPG几十年来一直致力于高分辨率重力场模拟的卫星概念，GS-LMU开创了高分辨率全球地幔环流模型，能够通过基于伴随方法的复杂流体反演理论推断过去的地幔流动和结构。我们希望解决的关键问题包括：1） 固体地球相关的信号可以在重力解中分离吗？（二） 在哪些时间段内，人们可以依赖于固体地球相关重力趋势的线性插值？第三章 该地区是否存在持续的垂直运动？它与地质观测推断的新生代隆起脉冲有何关系？使用最先进的重力处理技术，结合强大的，高分辨率的地幔环流，代表非线性对流信号，将有助于我们区分端元假说的影响，地幔对流可能在塑造区域构造演化，即占主导地位的准稳定，下地幔相关的流动，或者，突出的脉动，半幕式上地幔流。