Towards a Global Reconciliation of Last Interglacial Sea Level Observations

海平面上升的重建和预测目前的准确性有限，我们的动态冰盖行为的不完整的理解。最近的研究表明，末次间冰期（LIG）期间的海平面上升可能与21世纪后期的预测相似;然而，到目前为止，还不可能对这一时期的海平面变化进行一致的重建，强调需要更好地了解冰盖体积和范围变化的影响。冰川-水文-均衡效应可以掩盖位于冰盖附近的地点的海平面变化信号，需要在远场地点调查海平面变化（例如，该项目由佛罗里达大学的一名教员领导，与澳大利亚科学家合作，利用塞舌尔的珊瑚化石，通过成岩评估、铀系测年和结合地球物理（冰川-水文-均衡）建模的测量，重建海平面。还将调查整个加勒比海的LIG海平面标志。总之，数据集和模型结果将对过去的冰盖体积和范围进行限制，这将有助于解决海平面重建中的严重差异（+4米），并有助于生成最佳估计的海平面变化曲线。海平面变化数据和地球物理建模的整合与PALSEA的目标密切相关，PALSEA是一个PAGES/ICOND工作组，旨在使用古记录对未来海平面上升进行经验约束。这项工作将涉及首席研究员和她的国际同事之间的密切合作。教育方面的影响包括佛罗里达大学的本科生参加了“巴哈马地质学”课程，他们将直接参加该项目的实地部分;此外，这些学生将参加一系列讲座，介绍有关工作的背景。该项目还将在佛罗里达自然历史博物馆举办的促进STEM研究的多媒体展览中展出。该奖项将支持早期职业研究人员的专业发展，以及博士生和几个本科生助理的培训。

Sea level rise reconstructions and predictions are currently limited in accuracy by our incomplete understanding of dynamic ice sheet behavior. Recent research indicates that sea level rise during the Last Interglacial (LIG) period may have been similar to what is projected for later in the 21st century; thus far, however, it has not been possible to produce consistent reconstructions of eustatic sea level change for this period, underscoring the need to better understand the influence of changing ice sheet volume and extent. Glacio-hydro-isostatic effects can obscure the eustatic sea level change signal at sites located near ice sheets, necessitating investigations of sea level change at far-field sites (e.g., the Indian Ocean and Caribbean) where these effects are less severe.This project, led by a faculty member at the University of Florida in collaboration with Australian scientists, uses fossil corals in the Seychelles to reconstruct eustatic sea level via diagenetic assessments, Uranium-series dating, and surveying integrated with geophysical (glacio-hydro-isostatic) modeling. LIG sea level markers across the Caribbean will be also be surveyed. Together, the dataset and model results will place constraints on past ice sheet volumes and extents, which will help to resolve serious disparities (+4 m) in sea level reconstructions, as well as facilitating the generation of a best-estimate eustatic sea level change curve. The integration of sea level change data and geophysical modeling involved in this research aligns closely with the objectives of PALSEA, a PAGES/IMAGES working group created to place empirical constraints on future sea level rise using the paleo record. The work will involve close collaboration between the lead researcher and her international colleagues. Educational impacts include the involvement of undergraduates at the University of Florida enrolled in a "Geology of the Bahamas" course, who will directly participate in the field component of this project; in addition, these students will participate in a series of lectures placing the work in context. The project will also be featured in a multimedia exhibit promoting STEM research at the Florida Museum of Natural History. This award will support the professional development of an early-career researcher, as well as the training of a PhD student and several undergraduate assistants.