Holocene Paleoclimate in Southwestern United States of America from Annual Banding in Stalagmites

从石笋的年度带状来看美国西南部的全新世古气候

• 批准号: 0214333
• 负责人: Victor Polyak
• 金额: $ 18.16万
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0214333&HistoricalAwards=false
• 关键词: Holocene; Paleoclimate; Southwestern; United; States

This award is for research that will acquire high-resolution Holocene climate records for the southwestern USA using isotopic (i.e., oxygen-18 and carbon-13) and mineralogical (i.e., microprobe studies of strontium and magnesium) analyses of stalagmites formed in caves in Carlsbad Cavern and other caves of the Guadalupe Mountains in southeastern New Mexico. Stalagmites hold the potential for possessing a windfall of high-resolution records of paleoclimate because of recent advances in dating speleothems (i.e., cave deposits that include stalagmites) using thermal ionization mass spectrometry Uranium-series method. For example, in many cases, banding in speleothems is sufficiently uniform and distinct to allow frequency analyses to examine El Nino/Southern Oscillation (ENSO) scale variability. In the southwestern region of the United States, compelling evidence exists that changes in precipitation are related to changes in El Nino intensity.The broader impacts of this proposed research center on the development of a new archive of paleoclimatic data from terrestrial sites. Success in demonstrating the fidelity of speleothems for recording climatic events will dramatically improve our understanding of climate.

该奖项旨在奖励通过对美国西南部洞穴中形成的石笋进行同位素（即氧 18 和碳 13）和矿物学（即锶和镁的微探针研究）分析来获取美国西南部高分辨率全新世气候记录的研究。卡尔斯巴德洞穴和新墨西哥州东南部瓜达卢佩山脉的其他洞穴。 由于使用热电离质谱铀系方法对洞穴沉积物（即包含石笋的洞穴沉积物）进行测年的最新进展，石笋有可能获得大量高分辨率的古气候记录。 例如，在许多情况下，洞穴中的条带足够均匀且清晰，可以通过频率分析来检查厄尔尼诺/南方涛动 (ENSO) 尺度的变化。 在美国西南部地区，有令人信服的证据表明降水量的变化与厄尔尼诺强度的变化有关。该拟建研究中心对陆地站点古气候数据新档案的开发具有更广泛的影响。 成功证明洞穴生物记录气候事件的保真度将极大地提高我们对气候的理解。