A Model-Data Approach to Better Understand Paleoclimate Records of Stable Water Isotopes in High-Elevation, Lower-Latitude Glaciers

更好地了解高海拔、低纬度冰川中稳定水同位素古气候记录的模型数据方法

• 批准号: 2303577
• 负责人: Zhengyu Liu
• 金额: $ 89.27万
• 依托单位: Ohio State University
• 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: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2303577&HistoricalAwards=false
• 关键词: Model; Data; Approach; Better; Understand

This project generally aims to develop a framework using modeling approaches to interpret climate variability from ice core delta Oxygen-18 in low-latitude and tropical glaciers. Specifically, the researchers will examine water isotopes not only in surface precipitation, but also in relationship with the vapor delta Oxygen-18 throughout the atmospheric column. The key regions of investigation are the tropical Andes and northwestern Tibetan Plateau where isotopic observations of ice from the tropical Andes are presumed a proxy for atmospheric temperature while the Tibetan Plateau evidences a mixture of temperature and precipitation signals.Vapor delta oxygen-18 is studied and used most extensively to represent temperature variability in the polar regions or precipitation variability in cave speleothems in low-land tropical monsoon regions. Its climatic interpretation in ice cores from mid-latitude and tropical mountain glaciers, however, is more poorly understood, raising a question for the paleoclimate community: Is vapor delta oxygen-18 from ice cores recovered from tropical and mid-latitude glaciers a proxy for temperature or precipitation?Furthermore, to facilitate comparisons of ice core records and simultaneously reduce model bias due to unrealistically low model topography, the researchers will perform high-resolution model experiments with model topography elevated to the actual altitude of the ice cores. The goal of the model-data integration exercise is to improve understanding of how to interpret climate variability from ice core delta Oxygen-18 precipitation in low-latitude and tropical glaciers.The potential Broader Impacts include support of a post-doctoral scholar and doctoral student, annual outreach activities to the public through the Byrd Polar Climate Research Center, and, importantly, addressing a knotty climate science interpretation issue.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.

该项目通常旨在使用建模方法来开发框架，以在低纬度和热带冰川中解释冰核Delta oxygen-18的气候变化。 具体而言，研究人员将不仅检查表面降水中的水同位素，而且还将与整个大气色谱柱中的蒸气三角洲氧18相关。调查的关键区域是热带安第斯山脉和西北藏族高原，从热带安第斯山脉中对冰的同位素观察被认为是大气温度的代理，而藏族高原的证据是温度和降水信号的混合物。低地热带季风区域中的speleothems。 Its climatic interpretation in ice cores from mid-latitude and tropical mountain glaciers, however, is more poorly understood, raising a question for the paleoclimate community: Is vapor delta oxygen-18 from ice cores recovered from tropical and mid-latitude glaciers a proxy for temperature or precipitation?Furthermore, to facilitate comparisons of ice core records and simultaneously reduce model bias due to unrealistically low model地形，研究人员将对高分辨率模型实验进行高分辨率模型实验，并将模型地形升高到冰芯的实际高度。模型数据集成练习的目的是提高对如何解释低纬度和热带冰川中的冰核心核心氧气中的气候变化的理解。潜在的广泛影响包括对博士后学者和博士生的支持，通过BYRD Polly Crigation Condivation Clignts congimate climate climate conkitif shnss offiction Climate conscipry of Sciention shnss offiction scippent of to Po.法定任务，并被认为是值得通过基金会的智力优点和更广泛影响的审查标准来评估的值得支持的。