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; 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.

该项目利用了稳定同位素气候代理的正向建模的最新进展。 研究人员将结合建模与热带全新世气候变化的新记录，从斑点，湖泊记录和冰芯中，以更好地限制对陆地稳定的同位素稳定同位素记录的解释，对千年时间表对千年时间表。 具体而言，研究人员将评估戈达德太空研究研究所（GISS）Modele-R（一种具有同位素的海洋 - 大气通用循环模型）重现热带地区全新世气候变异性的能力。该研究的总体科学目的是了解轨道强迫对热带融合区（ITCZ）位置的影响，哈德利和沃克循环细胞的变化以及每个半球中季风的强度以及它们对模型输出中同位素的各自影响。该研究有两个特定的研究推力，如下：1）将现有的同位素记录合成为时空网络，可以将其与〜1,000年的时间步骤中的GISS Modele-r输出相提并论，以获得整个全封元的热带水力学周期的动态一致且在物理上可见的情况； 2）诊断整个热带代理部位的整个全新世对模型中的同位素变化的气候控制。最广泛的影响涉及对研究生的支持，并评估气候模型在热带水文周期中重现过去变化的能力及其对未来人为气候变化预测的影响。