Post-glacial rebound from high precision geodetic measurements

高精度大地测量带来的冰河后反弹

• 批准号: 249933-2006
• 负责人: Pagiatakis, Spiros
• 金额: $ 2.17万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=361679
• 关键词: Post; glacial; rebound; precision; geodetic

Climate, environment, ecosystems, human society and their interrelationships from the global perspective are of profound importance and significance nowadays. It is remarkable that still very little is known about our climate and its long-term changes as they relate not only to the atmospheric masses but to the arctic regions and the oceans as well. There is strong evidence that the polar regions of the Earth are the most sensitive showing the fastest warming rates than any other region on Earth. One characteristic physical phenomenon that is a result of climate change over the last several tens of thousands of years is the post-glacial rebound (PGR) or glacial isostatic adjustment (GIA), which can be described as the slow rebounding of the Earth's crust after the immense volumes of ice accumulated during the last major glaciation event (Pleistocene period) started melting some 21000 years ago. GIA is closely related to both the interior structure of the Earth and to the long-term global warming that causes deglaciation. The study of this continuing adjustment of the crust offers unique opportunities for understanding climate change and its impact on our daily lives. Research on GIA has been primarily based on geophysical modeling that describes the Earth deformations with complicated mathematical apparatuses and with limited verification from independent external sources. The proposed research comes to complement and ultimately improve the GIA models with the use of high precision geodetic measurements such as terrestrial and satellite gravity observations, Earth crust displacement monitoring with traditional and space geodetic techniques as well as crustal structure (density) from inversion of geoid models. This research proposes thorough analyses and interpretation of the geodetic observations by developing new theories, methodologies, and analytical tools. Once completed, the results of this research will enhance the geophysical models, and will be the catalyst for understanding Earth processes and climate change.

气候、环境、生态系统、人类社会及其相互关系在全球范围内具有深远的意义。值得注意的是，我们对气候及其长期变化的了解仍然很少，因为它们不仅与大气质量有关，而且与北极地区和海洋有关。有强有力的证据表明，地球的极地地区是最敏感的，比地球上任何其他地区都显示出最快的变暖速度。一个典型的物理现象，是气候变化的结果，在过去的几万年是冰川后反弹（PGR）或冰川均衡调整（GIA），这可以被描述为地球的地壳缓慢反弹后，大量的冰积累在最后一次重大冰期事件（更新世时期）开始融化约21000年前。GIA与地球内部结构和导致冰川消退的长期全球变暖密切相关。研究地壳的这种持续调整为了解气候变化及其对我们日常生活的影响提供了独特的机会。GIA的研究主要基于地球物理建模，该模型使用复杂的数学工具描述地球变形，并且来自独立外部来源的验证有限。拟议的研究来补充和最终改进GIA模型与使用高精度大地测量，如地面和卫星重力观测，地壳位移监测与传统和空间大地测量技术，以及地壳结构（密度）反演大地水准面模型。本研究提出通过发展新的理论、方法和分析工具对大地测量观测进行深入的分析和解释。一旦完成，这项研究的结果将增强地球物理模型，并将成为理解地球过程和气候变化的催化剂。