Collaborative Research: P2C2--Controls on Water Isotope Variability in the Tropical Pacific: A Strategy to Improve Paleoclimate Interpretations

合作研究：P2C2——热带太平洋水同位素变异的控制：改善古气候解释的策略

• 批准号: 1203785
• 负责人: Kim Cobb
• 金额: $ 22.64万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-10-01 至 2016-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1203785&HistoricalAwards=false
• 关键词: Collaborative; Research; P2C2; Controls; Water

Paleoclimate reconstructions of past tropical precipitation rely on interpreting hydrogen and oxygen isotopic variations in terms of past changes in precipitation. This project has the goal of better understanding of the response of tropical Pacific precipitation to climatic variability and how the stable isotope composition of the rainfall is affected by seasonal and interannual changes in the climate. The researchers include a scientist and a postdoctoral fellow from Georgia Institute of Technology and a scientist from the University of Colorado. They will collect and measure the stable oxygen and hydrogen isotopes in water vapor, rainfall and seawater from four island locations in the tropical Pacific. Samples will be collected on site during field programs executed by the PIs. The sampling program will also include year-round sampling by local individuals who will be trained in proper sampling techniques. The sampling strategy includes ultra high-resolution sampling of the diurnal cycle, as well as daily and longer sampling in order to evaluate the relationship of water isotope variability to climate change from sub-seasonal to interannual time scales and on a basin wide scale. The stable isotope data will be integrated with an isotope-enabled climate model at the National Center for Atmospheric Research to link the climate mechanisms for the isotope variability at high frequency with the resulting longer term averaged values that typify the type of data reconstructed by paleoclimate proxies of rainfall. Using this approach, the PIs hope to provide a more accurate evaluation of paleoclimate proxies as well as a better understanding of the uncertainties embedded in these types of reconstructions.The recent rise in the number of paleoclimate publications dedicated to measuring and interpreting water stable isotopes, and the possibly oversimplified nature of some of the interpretations, makes this project likely to have a significant impact on paleoclimate research. The project includes two established researchers, Kim Cobb (GA. Tech.) and David Noone (CU), but the main driver of this project is Jessica Conroy, an EAR Postdoctoral Research Fellow at Ga. Tech., supported by the AGS Paleoclimate Program. This project builds on the PRF award by providing greater access to the Pacific for sampling, collaboration with Noone at CU for access to the NCAR GCMs, and a third year of support for the postdoc to complete the work.

过去的热带降水的古气候重建依赖于解释氢和氧同位素的变化，在过去的降水变化。 该项目的目标是更好地了解热带太平洋降水对气候变化的反应，以及降水的稳定同位素组成如何受到气候季节性和年际变化的影响。 研究人员包括来自格鲁吉亚理工学院的一名科学家和一名博士后研究员以及来自科罗拉多大学的一名科学家。 他们将从热带太平洋的四个岛屿收集和测量水蒸气、降雨和海水中的稳定氧和氢同位素。 在PI执行现场项目期间，将在研究中心采集样本。 抽样方案还将包括由当地个人进行的全年抽样，这些人将接受适当抽样技术的培训。 采样战略包括对日周期进行超高分辨率采样，以及每日和更长时间的采样，以便从次季节到年际时间尺度和在流域范围内评估水同位素变异与气候变化的关系。 稳定同位素数据将与国家大气研究中心的同位素气候模型相结合，将同位素变化的气候机制与由此产生的长期平均值联系起来，这些长期平均值代表了由降雨的古气候代理重建的数据类型。 使用这种方法，PI希望提供一个更准确的评估古气候代理，以及更好地了解嵌入在这些类型的reconstruction.The最近上升的古气候出版物的数量致力于测量和解释水稳定同位素，和可能过于简单的性质，一些解释，使这个项目可能会对古气候研究产生重大影响。 该项目包括两位知名研究人员Kim Cobb（佐治亚州）。技术人员）和大卫努恩（CU），但这个项目的主要驱动力是杰西卡康罗伊，在佐治亚州的博士后研究员。技术人员：由AGS古气候计划支持。 该项目建立在PRF奖的基础上，通过提供更多的太平洋采样机会，与CU的Noone合作获得NCAR GCM，以及为博士后完成工作提供第三年的支持。