COLLABORATIVE RESEARCH - Earth-Life Transitions: Integrated Data-Model Analysis of CO2-Climate-Vegetation Feedbacks in a Dynamic Paleo-Icehouse

合作研究 - 地球-生命转变：动态古冰库中二氧化碳-气候-植被反馈的综合数据模型分析

• 批准号: 1338281
• 负责人: Isabel Montañez
• 金额: $ 49.55万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1338281&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Earth; Life; Transitions

COLLABORATIVE RESEARCH :Integrated Data-Model Analysis of CO2-Climate-Vegetation Feedbacks in a Dynamic Paleo-IcehousebyIsabel Montanez, Univ. California, Davis EAR-1338281Christopher Poulsen, Univ. Michigan, EAR-1338200Joseph White, Baylor University, EAR-1338247Michael Hren, Univ. Conneticutt, EAR-1338256ABSTRACTOverview: Vegetation-CO¬2-climate feedbacks have been shown to be an important component of the climate system, capable of perturbing atmospheric circulation, continental surface temperatures, and hydrological cycling on regional- to global-scales. Recent work indicates that vegetation-climate feedbacks likely had the potential to push the late Paleozoic climate system between glacial and interglacial states and to strongly modify the climate regime within these states. The details of the nature, time-scales, and potential impact of these feedbacks remain elusive. This multi-disciplinary project, driven by three interlinked hypotheses, addresses these shortcomings and analyzes the roles of CO2- and orbital-forcing and vegetation-climate feedbacks in promoting glacial-interglacial transitions on eccentricity- to multi-million year time-scales: - The response of vegetation to primarily CO2-driven glacial-interglacial transitions depended on the timing, magnitude and duration of CO2 forcing and whether critical ecological thresholds were reached.- Tropical vegetation, by way of physiological forcing, impacted low-latitude climate and water & C cycling- Vegetation-climate feedbacks - on a global-scale - amplified radiatively forced glacial-interglacial transitions through changes in direct surface forcing and terrestrial C & N cycling.These hypotheses are being tested through integrated empirical, experimental and multi-scale modeling approaches across a spectrum of time- (10 to 1,000,000 yr) and spatial-scales (leaf-to-canopy-to-global climate system). Climate-CO2-vegetation feedbacks, including the role of plant physiological forcing of climate will be assessed through a two-stage modeling effort that will first reformulate a terrestrial biosphere model (BIOME-BGC) using the empirical and experimental results coupled with modeling sensitivity experiments to define plant functional traits for late Paleozoic PFTs. In the second stage, we will incorporate these PFT traits into NCAR's fully coupled Community Earth System Model and use this version to investigate glacial-interglacial dynamics.Intellectual Merit: This research will generate the first high-resolution, high-precision reconstruction of atmospheric CO2 during the LPIA, which when incorporated into the climate modeling will provide insight into the evolution of earth system processes, including the terrestrial biosphere, in an icehouse under changing CO2 levels relevant to our long-term future. This study will be the first modification of terrestrial biosphere models to account for paleo-PFT traits and investigation of paleovegetation-climate feedbacks thus providing an improved understanding of the potential of non-angiosperm plants to influence hydrologic and C cycling through physiological forcing. Broader Impacts: Cross-disciplinary training and mentoring will occur through in-residence internships for the Ph.D. students. Underrepresented students to Earth and environmental sciences will be integrated through a range of summer and academic year internships and programs at the collaborating institutions. This study will contribute directly to a Carboniferous exhibit planned for the Paleontological Halls of the National Museum of Natural History, Smithsonian Institution. All data generated by this study will be archived and shared via publications, and web-accessible tools.

合作研究：动态古冰库中CO2-气候-植被反馈的综合数据-模型分析Isabel Montanez，加州大学，戴维斯分校，1338281克里斯托弗·波尔森，密歇根大学，1338200约瑟夫·白色，贝勒大学，1338247迈克尔·赫伦，康奈蒂科特大学，1338256摘要：植被-CO2-气候反馈已被证明是气候系统的重要组成部分，能够在区域到全球尺度上扰动大气环流、大陆表面温度和水文循环。最近的研究表明，植被气候反馈可能有可能推动晚古生代气候系统之间的冰期和间冰期状态，并强烈修改这些国家的气候制度。这些反馈的性质、时间尺度和潜在影响的细节仍然难以捉摸。这个多学科项目由三个相互关联的假设驱动，解决了这些缺点，并分析了CO2和轨道强迫和植被气候反馈在促进冰川-间冰期过渡偏心率到数百万年时间尺度上的作用：- 植被对主要由二氧化碳驱动的冰川-间冰期转变的反应取决于时间，CO2强迫的幅度和持续时间以及是否达到关键生态阈值。热带植被，通过生理强迫的方式，影响低纬度气候和水C循环-植被气候反馈-在全球范围内放大的辐射强迫冰川间冰期的过渡，通过直接表面强迫和陆地C N cycle.These假设的变化正在测试通过综合经验，实验和多尺度模拟方法在时间范围内-（10至100万年）和空间尺度（叶冠全球气候系统）。气候-CO2-植被反馈，包括植物生理强迫气候的作用，将通过两个阶段的建模工作，将首先重新制定陆地生物圈模型（BIOME-BGC）的经验和实验结果，再加上建模敏感性实验，以确定晚古生代PFT植物功能性状进行评估。在第二阶段，我们将把这些PFT特征整合到NCAR的完全耦合的社区地球系统模型中，并使用这个版本来研究冰川-间冰期动力学。这项研究将在LPIA期间产生第一个高分辨率，高精度的大气CO2重建，当纳入气候建模时，将提供对地球系统过程演变的洞察力，包括陆地生物圈，在一个冰库中，在与我们的长期未来相关的不断变化的二氧化碳水平下。这项研究将是第一次修改的陆地生物圈模型，以占古PFT性状和古植被气候反馈的调查，从而提供了一个更好的了解非被子植物植物的潜力，通过生理强迫影响水文和C循环。 更广泛的影响：跨学科的培训和指导将通过博士生的驻校实习发生。学生 地球和环境科学的代表性不足的学生将通过一系列夏季和学年实习和合作机构的计划进行整合。 这项研究将直接有助于石炭纪展览计划的国家自然历史博物馆，史密森学会古生物霍尔斯。本研究生成的所有数据将通过出版物和网络可访问工具进行存档和共享。