P2C2: Multi-Scale Analysis of Stable Isotope - Climate Relationships in Tropical Proxy Records

P2C2：热带代理记录中稳定同位素-气候关系的多尺度分析

• 批准号: 1003690
• 负责人: Mathias Vuille
• 金额: $ 28.96万
• 依托单位: SUNY at Albany
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1003690&HistoricalAwards=false
• 关键词: P2C2; Multi; Scale; Analysis; Stable

This project takes advantage of recent advances in forward modeling of stable isotopic climate proxies. The researchers will combine modeling with new records of tropical Holocene climate variability from speleothems, lake records, and ice cores to better constrain the interpretation of terrestrial stable isotopic records of Oxygen and Deuterium at inter-annual to millennial timescales. Specifically, the researchers will evaluate the ability of the Goddard Institute for Space Studies (GISS) ModelE-R, an isotope-enabled ocean-atmosphere general circulation model, to reproduce Holocene climate variability in the tropics. The overall scientific aim of the research is to understand the influence of orbital forcing on the location of the Inter Tropical Convergence Zone (ITCZ), changes in the Hadley and Walker circulation cells, and the intensity of monsoons in each hemisphere and their respective influence on isotopes in model output and climate proxy data. The research has two specific research thrusts, as follows: 1) synthesize existing isotopic records into a spatio-temporal network that can be compared with GISS ModelE-R output at ~1,000 year time steps to obtain a dynamically consistent and physically plausible picture of changes in the tropical hydrological cycle throughout the entire Holocene; and 2) diagnose the climatic controls on isotopic variations in the model throughout the Holocene at various tropical proxy sites. The primary broader impacts involve support for a graduate student and assessing a climate model's ability to reproduce past variations in the tropical hydrologic cycle and its ramifications for future anthropogenic climate change projections.

本项目利用了稳定同位素气候代用物正演模拟的最新进展。研究人员将把模型与来自洞穴、湖泊和冰芯的热带全新世气候变化的新记录结合起来，以更好地约束对氧和氘在年际到千年时间尺度上的陆地稳定同位素记录的解释。具体来说，研究人员将评估戈达德空间研究所（GISS）模型e- r的能力，这是一个同位素支持的海洋-大气环流模型，可以重现热带地区全新世的气候变化。该研究的总体科学目的是了解轨道强迫对热带辐合带（ITCZ）位置、Hadley和Walker环流单元的变化、各半球季风强度的影响及其对模式输出和气候代理数据中同位素的各自影响。本研究有两个重点：1)将现有的同位素记录综合成一个时空网络，并与GISS model - r在~ 1000年时间步长上的输出进行比较，获得整个全新世热带水文循环的动态一致和物理可信的变化图景；2)在不同的热带代用地点诊断气候对模式整个全新世同位素变化的控制。主要的更广泛的影响包括为研究生提供支持和评估气候模式重现过去热带水文循环变化的能力及其对未来人为气候变化预测的影响。