Collaborative Research: P2C2--Modalities and Time-scale of Climate Variability During the Late Holocene in Southwestern North America

合作研究：P2C2——北美西南部全新世晚期气候变化的形态和时间尺度

• 批准号: 1503133
• 负责人: Yemane Asmerom
• 金额: $ 42.27万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2019-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1503133&HistoricalAwards=false
• 关键词: Collaborative; Research; P2C2; Modalities; Time

This award generally aims to integrate high-precision age-dated 5,000 year-old speleothems with isotopic and chemical data from various environmental proxies in the southwestern United States. This study will focus on climate modulators that impact regional hydrologic cycles on differing time-scales. These modulators include the inter-annual varying El Nino-Southern Oscillation (ENSO), the decadal and multi-decadal Pacific Decadal Oscillation (PDO) and the Atlantic Multi-Decadal Oscillation (AMO), and solar variability which may act across varied time-scales. This region was chosen for the study because it has well-documented hydrologic sensitivity to climate forcing and modulation. The western United States has a long history of climate induced social disruption, dating back to pre-history. Understanding these natural changes will help contribute to a possible predictive capability of future changes in the hydrologic cycle. Such a predictive capability would be a societal benefit to the United States in that it could result in better resource planning and management. A further benefit of the project is the support of a graduate student at a minority serving university. Speleothems from regional caves provide an opportunity to observe possible changes in the modalities of these climate modulators over the long term and have demonstrated their fidelity to isotopic, chemical and physical climate proxies that are radiometrically datable using advances in uranium-series based chronometry.The project will specifically collect and evaluate data from two sites with different seasonal hydrologic cycles with the aim of isolating the seasonal component of observed changes and the responsible climate variables. For example, the North American Monsoon (NAM) is modulated by changes in the AMO. This seasonal delineation is important because it could help solve the puzzle of the change in coherence between the NAM and other recently documented Northern Hemisphere monsoons.

该奖项的总体目标是将具有 5,000 年历史的高精度洞穴化石与来自美国西南部各种环境指标的同位素和化学数据整合起来。 这项研究将重点关注在不同时间尺度上影响区域水文循环的气候调节剂。 这些调制器包括年际变化的厄尔尼诺南方涛动（ENSO）、年代际和年代际太平洋年代际涛动（PDO）和大西洋年代际涛动（AMO），以及可能在不同时间起作用的太阳变率。秤。选择该地区进行研究是因为该地区对气候强迫和调节的水文敏感性有充分记录。 美国西部地区因气候引发的社会混乱有着悠久的历史，其历史可以追溯到史前时期。了解这些自然变化将有助于增强对水文循环未来变化的可能预测能力。 这种预测能力将为美国带来社会效益，因为它可以带来更好的资源规划和管理。该项目的另一个好处是少数族裔大学研究生的支持。来自区域洞穴的洞穴提供了一个机会，可以长期观察这些气候调节剂的模式可能发生的变化，并证明了它们对同位素、化学和物理气候指标的保真度，这些指标可以利用基于铀系的计时技术的进步进行辐射测量数据。将专门收集和评估来自具有不同季节水文循环的两个地点的数据，目的是分离观测到的变化的季节部分和负责的气候变量。例如，北美季风 (NAM) 受 AMO 变化的调节。这种季节划分很重要，因为它可以帮助解决 NAM 和其他最近记录的北半球季风之间的一致性变化之谜。