Holocene sea level changes in Southeast Asia

东南亚全新世海平面变化

• 批准号: 313882311
• 负责人: Professor Dr. Alessio Rovere, Ph.D.
• 金额: --
• 依托单位: Leibniz-Zentrum für Marine Tropenforschung (ZMT)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/313882311?language=en
• 关键词: Holocene; sea; level; changes; Southeast

Changes in relative sea level (RSL) are the net effect of contributions from eustatic, isostatic, tectonic and other local factors, such as subsidence due to sediment compaction. Holocene sea-level reconstructions are needed to constrain both vertical land movements and geophysical models of Glacial Isostatic Adjustment (GIA), that are in turn used to correct sea level measurements obtained with instrumental measures, such as tide gauges. Therefore, regional Holocene RSL datasets, surveyed following standardized protocols, represent a long-term baseline against which to assess changes in sea level during the past century and to evaluate sea-level changes in the 21st century at local and regional scale. While accurate Holocene RSL datasets are available for some areas, RSL reconstructions for a region highly vulnerable to future sea level rise such as Southeast Asia are still limited, fragmentary and there are still problems associated with the correct interpretation of sea-level indicators and their relationship to sea level, and with the quality of age determinations. The overarching question of this proposal is: how can we improve our knowledge of relative Holocene sea level changes and associated processes in Southeast Asia? We will target this question re-analyzing published sea level datasets, which will be compiled in a database following a standardized approach. We will then expand our preliminary dataset, investigating several islands of the Spermonde Archipelago, which is an area that is highly sensitive to future sea level rise. Then, we will create a large set of earth models focusing on Southeast Asia, in order to have a full representation of the possible GIA effects in this area, including uncertainties due to the selected ice model and mantle viscosity profile, and use both our database and field data to refine the range of models that matches more closely geologic data. Our field data will be then analyzed using a Bayesian statistical approach in order to identify patterns of Late Holocene sea level changes. This information will be cross-analyzed with data from satellite imagery, which will be used to detect the level of human occupation of the different islands composing the Spermonde Archipelago and the land use patterns. This project, also thanks to the cooperation with the international partners that are world leaders in sea level science, will train a PhD student in all the aspects of sea level research, from laboratory and field techniques to earth modelling and data analysis.

相对海平面（RSL）的变化是海平面、地壳均衡、构造和其他局部因素（如沉积物压实引起的沉降）的净效应。全新世海平面重建需要约束垂直的陆地运动和地球物理模型的冰川均衡调整（GIA），这反过来又用来纠正海平面测量获得的仪器措施，如验潮仪。因此，区域全新世RSL数据集，按照标准化协议进行调查，代表了一个长期的基线，以评估在过去的世纪海平面的变化，并评估在21世纪的海平面变化世纪在当地和区域尺度。虽然精确的全新世RSL数据集可用于某些地区，RSL重建一个地区非常容易受到未来海平面上升，如东南亚仍然是有限的，零碎的，仍然存在问题，正确解释海平面指标及其与海平面的关系，并与年龄测定的质量。这个建议的首要问题是：我们如何提高我们的知识相对全新世海平面变化和相关过程在东南亚？我们将针对这个问题重新分析已发布的海平面数据集，这些数据集将按照标准化方法汇编在数据库中。然后，我们将扩大我们的初步数据集，调查斯佩尔蒙德群岛的几个岛屿，这是一个对未来海平面上升高度敏感的地区。然后，我们将创建一个大的地球模型集，重点放在东南亚，为了有一个完整的代表性，在这个地区可能的GIA影响，包括由于选定的冰模型和地幔粘度剖面的不确定性，并使用我们的数据库和现场数据来完善的模型，更紧密地匹配地质数据的范围。我们的现场数据，然后将使用贝叶斯统计方法进行分析，以确定晚全新世海平面变化的模式。这些信息将与卫星图像数据进行交叉分析，卫星图像数据将用于探测构成斯佩尔蒙德群岛的不同岛屿的人类居住水平和土地使用模式。该项目还将与海平面科学领域的世界领先的国际合作伙伴合作，培养一名海平面研究各方面的博士生，从实验室和实地技术到地球建模和数据分析。