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.

该奖项通常旨在将高精年龄的5,000年历史年龄段与来自美国西南部各种环境代理的同位素和化学数据相结合。 这项研究将集中于影响区域水文循环对不同时间尺度的气候调节剂。 这些调节剂包括年间变化的El Nino-Southern振荡（ENSO），十年和多年的太平洋十年际振荡（PDO）以及大西洋多年振荡（AMO）（AMO）以及太阳可变性，这些变异性可能会跨越各种时间表。之所以选择该区域，是因为它对气候强迫和调节具有据可查的水文敏感性。 美国西部的气候历史悠久，引起了社会破坏，可以追溯到史前。了解这些自然变化将有助于有助于水文周期中未来变化的可能性能力。 这样的预测能力将是美国的社会利益，因为它可能会带来更好的资源计划和管理。该项目的进一步好处是在少数服务大学的研究生的支持下。来自区域洞穴的尖峰提供了一个机会，可以长期观察这些气候调节剂的模式可能发生变化，并证明了它们对同位素，化学和物理气候代理的忠诚度，这些代理使用基于铀系列的季节性的季节性来隔离和评估隔离的季节性，这些季节是在放射线图上进行放射线数据的，这些季节是特定的。观察到变化和负责任的气候变量。例如，北美季风（NAM）受AMO的变化调节。这种季节性描述很重要，因为它可以帮助解决NAM与其他最近有记录的北半球季风之间连贯性变化的难题。