EAR-PF: Large-scale climate controls on water isotopes in the tropical Pacific: an integrated observational and modeling strategy to improve paleoclimate interpretations

EAR-PF：热带太平洋水同位素的大规模气候控制：改善古气候解释的综合观测和建模策略

• 批准号: 1049664
• 负责人: Jessica Conroy
• 金额: $ 17万
• 依托单位: Conroy Jessica L
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1049664&HistoricalAwards=false
• 关键词: EAR; PF; Large; scale; climate

Dr. Jessica Conroy has been awarded an NSF Earth Sciences Postdoctoral Fellowship to carry out a research and education plan at Georgia Institute of Technology. Dr. Conroy will carry out a multi-year precipitation and seawater sampling program to assess stable isotopes variability on diurnal, seasonal, and interannual timescales across the equatorial Pacific Ocean. This information will then be coupled with instrumental climate data to investigate the climate controls on stable isotopes in precipitation and seawater. The data produced from this project will fill a critical gap in observational networks for water isotopes, providing for rigorous comparisons to isotope-equipped global climate models and satellite-based water isotope retrievals. An improved knowledge of the relationship between large-scale climate dynamics and water isotope variability in the tropical Pacific will also allow for more accurate interpretations of key tropical Pacific proxy records across a range of timescales.Much of the importance of stable water isotopes lies in their ability to provide information on past climate change. The vast majority of tropical Pacific paleoclimate reconstructions from corals, speleothems, lake sediments, and marine sediments are based on the stable isotope values of oxygen and/or hydrogen, which reflect changes in large-scale hydrological processes, and, in the case of carbonate archives, temperature. Accurate interpretation of these records is critically important, since climate variability in this region impacts climate across the globe, most notably through the El Niño/Southern Oscillation phenomenon. Typically, output from isotope-equipped global climate models aids in the interpretation of isotope archives of past climate information, and forward modeling of proxies provides insight into the dominant controls on isotope-based proxy climate records. However, there are few real isotope measurements from the tropical Pacific to validate climate models and incorporate into forward modeling of proxies. The new dataset generated from this project will provide these measurements, helping us to understand the controls on stable water isotope variability and accurately interpret past climate variability in this important region. The planned education activities associated with this fellowship include the development of a "Stable Isotopes and Climate" curriculum for a local public high school and student science-fair projects, and the exposure of native Pacific Islanders to scientific data collection and interpretation.This fellowship is supported by the Paleolimate Program in the Division of Atmospheric and Geospace Scieneces.

杰西卡·康罗伊博士被授予NSF地球科学博士后奖学金，在格鲁吉亚理工学院开展研究和教育计划。康罗伊博士将开展一项多年降水和海水采样计划，以评估稳定同位素在赤道太平洋的昼夜、季节和年际时间尺度上的变化。然后将把这些信息与仪器气候数据结合起来，调查气候对降水和海水中稳定同位素的控制。该项目产生的数据将填补水同位素观测网络中的一个关键空白，为与配备同位素的全球气候模型和卫星水同位素反演进行严格比较提供条件。更好地了解热带太平洋大尺度气候动态和水同位素变异之间的关系，也将有助于更准确地解释一系列时间尺度上的关键热带太平洋代用记录，稳定水同位素的重要性主要在于它们能够提供有关过去气候变化的信息。绝大多数的热带太平洋古气候重建珊瑚，洞穴沉积物，湖泊沉积物和海洋沉积物的基础上的氧和/或氢的稳定同位素值，这反映了大规模的水文过程的变化，并在碳酸盐档案的情况下，温度。对这些记录的准确解释至关重要，因为该区域的气候变异性影响到整个地球仪的气候，特别是通过厄尔尼诺/南方涛动现象。通常情况下，从同位素装备的全球气候模式的输出有助于解释过去的气候信息的同位素档案，和代理的正演模拟提供了对同位素为基础的代理气候记录的主导控制洞察。然而，有几个真实的同位素测量热带太平洋，以验证气候模型，并纳入代理的正演模拟。该项目产生的新数据集将提供这些测量结果，帮助我们了解对稳定水同位素变化的控制，并准确解释这一重要地区过去的气候变化。与该研究金计划有关的教育活动包括为当地公立高中和学生科学展览项目编制“稳定同位素和气候”课程，以及让太平洋岛民接触科学数据收集和解释，该研究金得到大气和地球空间科学司古气候方案的支助。