EAGER: Constraining the Y-axis: Towards Quantitative Constraints for Precipitation and Temperature Using Speleothem Isotope and Trace Element Data

EAGER：约束 Y 轴：使用 Speleothem 同位素和痕量元素数据对降水和温度进行定量约束

• 批准号: 1935490
• 负责人: Yemane Asmerom
• 金额: $ 8.15万
• 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: 2019
• 资助国家: 美国
• 起止时间: 2019-07-01 至 2021-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1935490&HistoricalAwards=false
• 关键词: EAGER; Constraining; axis; Towards; Quantitative

This project uses funds, under the auspices of the EArly Concept Grant For Exploratory Research (EAGER) program, to focus on ways to take advantage of recent advances in mass spectrometry and data analysis in order to produce quantitative measures of temperature and precipitation from the paleoclimate record.An initial analytical finding suggests that the 88Strontium/86Strontium ratio in carbonates is sensitive to changes in temperature. This ideal relationship has been found to be complicated by limited experimental data that suggest that other factors, such as growth kinetics may play a role in this value. The researcher made some initial measurements using high temperature and low temperature carbonates and the data are encouraging to the extent that there seems to be a strong relationship between 88Strontium/86Strontium and temperature. There is no data on hand, however, to convincingly demonstrate temperature dependence in the range of temperature relevant for paleoclimate. Recent advances in thermal ionization mass spectrometry (TIMS) coupled with the "double spike" method could allow enough accuracy and precision to test the idea. In addition, stalagmites from Fort Stanton Cave that grew through the full climate swings that took place from the Last Glacial to the Early Holocene are ideal for analysis and are in-hand. The Strontium isotopic work will be attempted in a laboratory that houses a new generation of amplifier that would make it possible to obtain very accurate and precise 88Strontium/86Strontium ratios, sufficient to resolve potential changes in temperature at a scale relevant for paleoclimate. The researcher will also work on the design of a sample chamber that can accommodate long stalagmite samples.Another aspect of the project that holds promise is the combined technical achievements in high-throughput and high-quality elemental data using newer excimer lasers coupled to inductively coupled plasma mass spectrometry (ICP-MS) instruments and new ways to look at data using machine learning. Initial results by the researcher show that some trace elements, especially alkali and alkali-earth elements, may coherently vary with stable isotopes, thus providing the multidimensional data needed for machine learning applications. The activities are scientifically important and fit well into the potentially transformative, high-risk but potential high payoff research attributes of the EAGER program.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

This project uses funds, under the auspices of the EArly Concept Grant For Exploratory Research (EAGER) program, to focus on ways to take advantage of recent advances in mass spectrometry and data analysis in order to produce quantitative measures of temperature and precipitation from the paleoclimate record.An initial analytical finding suggests that the 88Strontium/86Strontium ratio in carbonates is sensitive to changes in temperature. 有限的实验数据发现，这种理想的关系变得复杂，表明其他因素（例如生长动力学）可能在该值中起作用。 研究人员使用高温和低温碳酸盐进行了一些初始测量，并且数据令人鼓舞，以至于在88 strontium/86 strontium和温度之间似乎存在牢固的关系。 但是，没有数据可令人信服地证明与古气候相关的温度范围内的温度依赖性。 热电离质谱法（TIMS）的最新进展以及“双峰”方法可以允许足够的准确性和精确度来测试这个想法。 此外，从斯坦顿堡洞穴（Fort Stanton Fort Cave）的Stalagmites通过从最后一次冰川到早期全新世的全部气候波动而生长，非常适合分析，并且是手头的。 将尝试在一个新一代放大器的实验室中尝试延髓同位素工作，该实验室将有可能获得非常准确，精确的88 strontium/86 strontrontium比率，足以解决与古气候相关的规模上的潜在温度变化。 研究人员还将在设计室的设计上工作，该样品室可以容纳长期的静止样品。研究人员的初始结果表明，一些痕量元素，尤其是碱和碱地元素，可能会随稳定的同位素而变化，从而提供机器学习应用所需的多维数据。 这些活动在科学上很重要，并且非常适合渴望的计划的潜在变革性，高风险但潜在的高收益研究属性。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估评估标准来通过评估来获得支持的。