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Disentangling Drivers of Heat and Freshwater Transport through the Indonesian Seas Across Timescales: Insights from Marine Sediments and Model Simulations

解开印度尼西亚海域跨时间尺度的热量和淡水输送的驱动因素：来自海洋沉积物和模型模拟的见解

基本信息

批准号：
2303513
负责人：
Delia Oppo
金额：
$ 83.2万
依托单位：
Woods Hole Oceanographic Institution
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2023
资助国家：
美国
起止时间：
2023-06-01 至 2026-05-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2303513&HistoricalAwards=false
关键词：
Disentangling Drivers Heat Freshwater Transport

项目摘要

The Indo-Pacific Warm Pool (IPWP) covers a large area of the tropical western Pacific and eastern Indian Oceans. Recent observations indicate that the IPWP is undergoing profound changes. The Indonesian Throughflow (ITF) is also changing. The ITF moves relatively warm and fresh upper ocean waters from the western Pacific and Indonesian Seas to the Indian Ocean. This movement plays a critical role in the climate of the region. However, limited oceanographic data from the region make separating natural variability from anthropogenic trends challenging. Given the significance of the IPWP, separating multidecadal variability and anthropogenic trends is critical. This study will combine data collected from sediment cores with model simulations to investigate 1100 year of changes in the ITF. As part of this work, K-12 educational material will be created for schools in the Indo-Pacific region. The project will support a graduate student, and a post-doctoral researcher.The team will conduct a modeling – data collection effort to gain insights into the controls of the ITF and how they might differ across time scales and background climate states over the last millennium, including the Industrial Era. New, well-dated, highly-resolved, records of thermocline structure, reconstructed using geochemical and faunal measurements, will extend instrumental records from the ITF region to span the last millennium. Dynamical interpretations of the data will be provided by a hierarchy of ocean and climate models, which will be used to evaluate the dominance of wind and buoyancy forcing on different time scales, and link reconstructed variability to multidecadal variations in tropical Pacific mean state (e.g., the Walker circulation) and the monsoons. Models will also be used to assess if and why modern warming has altered the relationship between global temperature and the Walker circulation, as well as to evaluate the climate impacts of ITF variability and how they are transmitted (atmospheric or oceanic teleconnections) in simulations of the past, and in future projections.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

印度-太平洋暖池（IPWP）覆盖了热带西太平洋和东印度洋的大片地区。最近的观察表明，IPWP正在发生深刻的变化。印尼通流（ITF）也在发生变化。ITF将相对温暖和新鲜的上层海水从西太平洋和印度尼西亚海输送到印度洋。这一运动对该地区的气候起着至关重要的作用。然而，该地区有限的海洋学数据使得将自然变率与人为趋势分开具有挑战性。鉴于IPWP的重要性，分离多年代际变率和人为趋势是至关重要的。这项研究将结合从沉积物岩心收集的数据和模型模拟来研究1100年来ITF的变化。作为这项工作的一部分，将为印度-太平洋地区的学校编写K-12教育材料。该项目将资助一名研究生和一名博士后研究员。该小组将进行建模数据收集工作，以深入了解对ITF的控制，以及它们在过去一千年（包括工业时代）的不同时间尺度和背景气候状态下的差异。利用地球化学和动物测量重建的新的、年代准确、分辨率高的温跃层结构记录，将把ITF地区的仪器记录扩展到过去一千年。数据的动力解释将由一系列海洋和气候模式提供，这些模式将用于评估不同时间尺度上风和浮力强迫的主导作用，并将重建的变率与热带太平洋平均状态（例如，沃克环流）和季风的多年代际变化联系起来。模式还将用于评估现代变暖是否以及为什么改变了全球温度与沃克环流之间的关系，以及在过去的模拟和未来的预测中评估ITF变率对气候的影响及其如何传播（大气或海洋遥相关）。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。