Collaborative Research: P2C2--Interrogating the Free Troposphere during the Last Deglaciation

合作研究：P2C2——审视末次冰消期的自由对流层

• 批准号: 2002422
• 负责人: Laurence Yeung
• 金额: $ 27.46万
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-05-01 至 2024-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2002422&HistoricalAwards=false
• 关键词: Collaborative; Research; P2C2; Interrogating; Free

This project aims to provide the first global-scale constraints on temperature and dynamics of the free- troposphere- which comprises altitudes ranging from about 2 - 18 km. Specifically, the researcher will use new isotopic measurements and 3 Dimensional (3D) global modeling to reconstruct and interpret high-altitude atmospheric temperature and circulation changes during the last deglaciation (18,000 to 8,000 years before present). This project will use an emerging tracer from ice-core records to generate a paleo-temperature record that will reveal the state of the troposphere and its interaction with the stratosphere across the most recent major climate transition in Earth history. Research goals include constraining the thermal evolution of the free troposphere during a time period that includes several episodes of abrupt climate change; testing modeled free-troposphere responses to orbital and greenhouse-gas forcing; and testing stratosphere-to- troposphere exchange dynamics across major climate transitions. This combined measurement-modeling study will constrain the paleoclimate at altitude during the most recent major episode of global change, when circulation patterns shifted under different climatic boundary conditions. The potential Broader Impacts include developing a new temperature record of the free troposphere during the last deglaciation. The application of a new isotopic tracer to investigate the dynamics of stratosphere-troposphere exchange is potentially transformative for paleoclimate research. Other broader impacts include participation of the researchers in STEM outreach events as part of their ongoing activities, including participation in the department’s annual Earth Day at Rice University with the Girl Scouts. The project will train one undergraduate and two graduate students, and support two early career researchers.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.

该项目旨在首次在全球范围内限制自由对流层的温度和动力学--自由对流层由大约2-18公里的高度组成。具体地说，研究人员将使用新的同位素测量和三维(3D)全球建模来重建和解释最后一次冰川消融(比现在早18,000到8,000年)期间高海拔大气温度和环流的变化。该项目将使用冰芯记录中新出现的示踪剂来生成古温度记录，揭示地球历史上最近一次重大气候转变期间对流层的状态及其与平流层的相互作用。研究目标包括限制自由对流层在一段时间内的热演变，这段时间包括几次气候突然变化；测试模拟的自由对流层对轨道和温室气体强迫的反应；以及测试主要气候转变期间平流层到对流层的交换动力学。这项测量与建模相结合的研究将限制全球变化最近一次重大事件期间的海拔古气候，当时环流模式在不同的气候边界条件下发生变化。潜在的更广泛的影响包括在最后一次冰川消融期间创造新的自由对流层温度记录。应用一种新的同位素示踪剂来研究平流层-对流层交换的动力学对古气候研究具有潜在的变革意义。其他更广泛的影响包括研究人员参与STEM外联活动，作为其持续活动的一部分，包括与女童子军一起参加该部门在莱斯大学举行的一年一度的地球日。该项目将培养一名本科生和两名研究生，并支持两名早期职业研究人员。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。