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·康罗伊博士获得了美国国家科学基金会地球科学博士后奖学金，以在佐治亚理工学院开展一项研究和教育计划。康罗伊博士将开展一项多年降水和海水采样计划，以评估稳定同位素的昼夜变化。然后，该信息将与赤道太平洋的季节性和年际时间尺度相结合，以研究对降水和海水中稳定同位素的气候控制。水同位素观测网络，提供与配备同位素的全球气候模型和基于卫星的水同位素反演的严格比较，进一步了解热带太平洋大规模气候动态与水同位素变异之间的关系也将有助于获得更多信息。对一系列时间尺度上的关键热带太平洋代理记录进行准确解释。稳定水同位素的重要性很大程度上在于它们能够提供有关过去绝大多数热带太平洋气候变化的信息。珊瑚、洞穴沉积物、湖泊沉积物和海洋沉积物的古气候重建是基于氧和/或氢的稳定同位素值，它反映了大规模水文过程的变化，如果是碳酸盐档案，还反映了温度的变化。对这些记录的准确解释至关重要，因为该地区的气候变化会影响全球气候，特别是通过厄尔尼诺/南方涛动现象，通常是同位素全球气候模型的输出。有助于解释过去气候信息的同位素档案，代理的正演模型提供了对基于同位素的代理气候记录的主导控制的深入了解。然而，来自热带太平洋的真实同位素测量很少可以验证气候模型并纳入其中。该项目生成的新数据集将提供这些测量结果，帮助我们了解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。为当地公立高中和学生科学博览会项目开设“稳定同位素和气候”课程，并使太平洋岛民接触科学数据收集和解释。这项奖学金得到了大气和气候司古石灰石计划的支持地球空间科学。