COLLABORATIVE RESEARCH: Understanding Climate Change During the Final Stages of Late Paleozoic Gondwanan Glaciation - An Integrated Data-Model Study

合作研究：了解晚古生代冈瓦南冰川最后阶段的气候变化——一项综合数据模型研究

• 批准号: 0544760
• 负责人: Christopher Poulsen
• 金额: $ 22.11万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-06-15 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0544760&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Understanding; Climate; Change

ABSTRACTCOLLABORATIVE RESEARCH: UNDERSTANDING CLIMATE CHANGE DURING THE FINAL STAGES OF LATEPALEOZOIC GONDWANAN GLACIATION - AN INTEGRATED DATA-MODEL STUDYIsabel Montanez, University of California, DavisVladimir Davydov & Mark Schmitz, Boise State UniversityChris Poulsen, University of MichiganNeil Tabor, Southern Methodist UniversityRecently developed paleoclimate archives reveal a much more dynamic transition from the latePaleozoic Gondwanan ice age to a greenhouse world than previously considered - one characterized byconsiderable co-variability in climate and pCO2. Recently documented short-lived (1 to 4 m.y.) episodesof glaciation appear to coincide with large magnitude shifts in atmospheric pCO2, marine and continentaltemperatures and relative sea-level suggesting a CO2-climate-glaciation link. This link, however, remainsuntested. We propose an interdisciplinary study focused on significantly improving our understanding ofthe evolution of the late Paleozoic climate system, and the mechanisms that triggered climate changeduring the Earth's last period of transition from icehouse to greenhouse states. The research is designed totest two hypotheses: (1) that atmospheric CO2 variability was the primary driver for repeated growth andretreat of continental ice sheets, and, in turn, (2) that late Paleozoic ice sheets strongly influenced globalclimate, particularly in the tropics. Specific basins in central and eastern Europe and western Argentinahave been targeted given their stratigraphic and paleogeographic coverage, presence of marine, paralicand paleosol-bearing terrestrial deposits, and their existing biostratigraphy and potential for furtherradiometric dating (i.e., multiple intercalated volcanic tuffs) and biostratigraphic analysis. This researchhas three major objectives:* To establish a radiometrically calibrated, chronostratigraphic framework (Gzhelian to early MiddlePermian) through the integration of new and existing bio-, cyclo-, and chemo-stratigraphic (87Sr/86Sr)data with U/Pb dating of volcanic tuffs, and the application of these integrated data to multiplequantitative tools (CONOP, RASC, CASP, GraphCor).* To further develop and calibrate high-resolution, quantitative proxy records of paleo-atmosphericpCO2, paleo-precipitation, and marine and terrestrial paleo-temperatures. This includes criticalevaluation and further development of new quantitative proxies as well as direct comparison of proxyrecords to sedimentologic evidence for glaciations and 'warmings' in southern Gondwanansuccessions.* Development of a theoretical climate framework for the late Paleozoic glacial-interglacial oscillationsusing three-dimensional climate models to quantify the sensitivity of ice sheets on Gondwana topCO2, determine the role of ice sheets in driving global climate change, and make climate predictionsthat can be tested through comparison with the proxy records.Broader Impacts: The proposed research will offer four major contributions to the broader scientificcommunity: (1) a reconstruction of the late Paleozoic climate system at an unprecedented level ofresolution and accuracy, (2) an important test of the pCO2-climate paradigm for climate evolution throughEarth history, (3) documentation of marine-terrestrial climate linkages at unprecedented temporalresolution for the Paleozoic, and (4) the first test of proposed correlations of cyclothemic successions ineastern Euramerican and North American basins, and of linkages to the Gondwanan glaciosedimentaryrecord. In addition, to the planned cross-disciplinary training of undergraduate and graduate students, thePIs will integrate their research efforts into three educational outreach programs designed to enhance theresearch and teaching opportunities of underrepresented undergraduate students and high school scienceteachers. We will make our data and model simulations available to the greater scientific community byimporting them into the CHRONOS System (and its partner website, PaleoStrat), a web-based interactiveresource with which PI Davydov is directly involved.

ABSTRACTCOLLABORATIVE RESEARCH: UNDERSTANDING CLIMATE CHANGE DURING THE FINAL STAGES OF LATEPALEOZOIC GONDWANAN GLACIATION - AN INTEGRATED DATA-MODEL STUDYIsabel Montanez, University of California, DavisVladimir Davydov & Mark Schmitz, Boise State UniversityChris Poulsen, University of MichiganNeil Tabor, Southern Methodist UniversityRecently developed paleoclimate archives reveal a much more dynamic transition from the晚期巨元冈瓦南（Gondwanan）到一个温室世界的冰河时代比以前认为的温室世界 - 一种特征在于气候和PCO2的可可可相互变化的特征。最近有记录的冰川作用的短暂寿命（1至4 M.Y.）发作似乎与大气PCO2，海洋和大陆植物以及相对海平面的大小变化相吻合，这表明二氧​​化碳气候 - 气候 - 气候链接。但是，此链接仍然受人不可。我们提出了一项跨学科研究，重点是显着提高我们对晚古生代气候系统的演变的理解，以及引发气候改变地球从冰屋向温室过渡到温室的最后一个时期的机制。这项研究设计了两个假设：（1）大气二氧化碳的变异性是反复生长和大陆冰盖的重量驱动力的主要驱动力，而反过来，（2）（2）（2）（2）后期古生代的冰盖强烈影响了全球环境，尤其是在热带地区。鉴于其地理和古地理的覆盖范围，海洋，副层和古代陆地陆地沉积物的存在以及现有的生物地层学以及促进的阶层阶段测度的潜力（即，多个层间的火山塔ac夫斯）和生物分析。这项研究三个主要目标：*通过整合新的和现有的生物，环和化学 - 层流和化学 - 层流和化学分层的数据（87SR/86SR）数据，并将u/pb的应用程序（以及u/pb的多个应用程序集成）（以及这些集成）（以及这些集成）（以及这些集成）（以及这些集成）（以及这些集成）（以及这些集成）（以及这些集成）（以及这些集成），以及将这些集成（以及这些集成）（以及这些集成）（以及这些集成）（以及这些集成）（以及这些集成）（以及这些集成）（以及这些集成），以将这些集成（以及这些集成）（以及这些集成）（以及这些集成）（以及这些集成），来建立一个受放射学校准的校准，年级地层框架（Gzhelian至Middlepermian早期）。 RASC，CASP，图形）。这包括重大评估和进一步发展新的定量代理以及在巨型旺旺旺种努力及南部的冰川和“冰川和“变暖”的沉积证证据之间直接比较。 determine the role of ice sheets in driving global climate change, and make climate predictionsthat can be tested through comparison with the proxy records.Broader Impacts: The proposed research will offer four major contributions to the broader scientificcommunity: (1) a reconstruction of the late Paleozoic climate system at an unprecedented level ofresolution and accuracy, (2) an important test of the pCO2-climate paradigm for climate进化的透明历史，（3）古生物学临时分辨率的海洋事物气候联系记录，以及（4）（4）对环球座位持续的拟议相关性的首次测试，欧洲裔美国人和北美盆地，以及与Gondwanan glacipedipuntimentarpimentarementarementaryaryrecord的联系。此外，在计划的本科和研究生的跨学科培训中，ThePIS将将他们的研究工作纳入三个教育外展计划中，旨在增强搜索和教学机会不足的本科生和高中生学家的机会。我们将通过将数据和模型模拟用于更大的科学界，通过将它们纳入Chronos系统（及其合作伙伴网站PreaStrat），这是一个基于Web的InteractiverSource，Pi Davydov与Pi Davydov直接参与其中。