P2C2: Hydroclimatic Variability in the Southwest United States: New High-Resolution Speleothem Records of Past Drought

P2C2：美国西南部的水文气候变化：过去干旱的新高分辨率洞穴记录

• 批准号: 0903093
• 负责人: Julia Cole
• 金额: $ 40.06万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0903093&HistoricalAwards=false
• 关键词: P2C2; Hydroclimatic; Variability; Southwest; United

Funding is provided to help characterize patterns of Holocene drought using new cave records from the Southwestern U.S. to better understand mechanisms of hydro-climatic variability in this arid region.The research is centered on the following science hypotheses: i) the North American monsoon intensified during the mid-Holocene due to higher local solar insolation; ii) regional hydro-climate undergoes substantial variability on multi-decadal to century time scales that are unrecognized in instrumental data and perhaps underrepresented by the comparatively shorter tree-ring reconstructions; iii) the past millennium experienced abrupt transitions among decadal/multi-decadal dry intervals; and iv) southwest drought can be linked to large-scale ocean-atmosphere forcing from both the Pacific and Atlantic Oceans.The broader impacts involve supporting students and providing data of potential use for regional water management.This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).

该研究的主要目的是利用美国西南部新的洞穴记录来描述全新世干旱的特征，以更好地理解这一干旱地区水文气候变化的机制。研究的核心是以下科学假设：i）在全新世中期，由于当地较高的太阳辐射，北美季风增强; ii）区域水文气候在几十年到世纪的时间尺度上经历了大量的变化，这些变化在仪器数据中未被识别，并且可能被相对较短的树木年轮重建所低估; ㈢过去的千年经历了十年/多十年干旱间隔的突然转变;西南干旱可能与大规模的海洋-来自太平洋和大西洋的大气强迫。更广泛的影响涉及支持学生和提供区域水管理潜在用途的数据。该奖项获得资助根据2009年美国复苏和再投资法案（公法111-5）。