ELT COLLABORATIVE RESEARCH: Investigating the Biotic and Paleoclimatic Consequences of Dust in the Late Paleozoic

ELT 合作研究：调查晚古生代尘埃的生物和古气候后果

• 批准号: 1338331
• 负责人: Gerilyn Soreghan
• 金额: $ 39.43万
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1338331&HistoricalAwards=false
• 关键词: ELT; COLLABORATIVE; RESEARCH; Investigating; Biotic

Collaborative Research:Investigating the Biotic and Paleoclimatic Consequences of Dust in the Late PaleozoicbyGerilyn Soreghan, University of Oklahoma, EAR-1338331Sarah Aciego, University of Michigan, EAR-1337440Linda Hinnov, Johns Hopkins University, EAR-1337454Nicholas Heavens, Hampton University, EAR-1337463Overview Geologic data indicate that the tropical atmosphere during the Permo-Pennsylvanian (300 Million years ago) was dust-rich. In addition, algae predominated in late Paleozoic marine ecosystems. These observations, combined with predictions from climate modeling, prompt two over-arching hypotheses driving the proposed research: 1) the unusual tropical dustiness reflects dust production by tropical upland glaciers, and 2) atmospheric dustiness fertilized marine ecosystems. Dust forces the climate system by affecting radiative forcing and atmospheric moisture, and by influencing the biosphere, but these effects are poorly known. In this research, PIs will collect data to constrain spatial (low-mid latitude) and temporal (glacial-interglacial and longer) variations in atmospheric 'dustiness,' sources of the dust, and influences between dust and ecosystem composition in order to address their over-arching hypotheses, and clarify the relationships among atmospheric dustiness, climate, and the biosphere.Intellectual MeritThis research will reveal process links among dust, climate, and the biosphere within an icehouse, at glacial-interglacial scales. Owing to the known importance but great uncertainty of both the direct and indirect effects of dust on climate, results will expand understanding of Earth-system behavior. Tropical glaciation at low elevations implies much more widespread glaciation than currently accepted, and --if verified-- would force the community to test this hypothesis with new modeling approaches. The models to be used are identical to those used for present and future climate, and thus improvements made through the proposed work will inform modeling of Earth's climate in general. If the hypothesis that atmospheric dustiness forced marine biotic systems toward nutrient-rich conditions is confirmed, it implies a remarkably dusty Earth, and clarifies Earth-system behavior to dust-sourced fertilization. These results are relevant to growing discussions regarding geo-engineering schemes to control future climate change. Broader ImpactsCross-disciplinary training will occur via exchanges between geological and geochemical labs, geologists and modelers, and in joint field excursions and progress meetings. PhD students will mentor middle-school teachers through a formal summer program. Undergraduates will conduct senior theses and present at Undergraduate Research Day and national meetings. Both will interact with middle- and high-school students through a formal course on STEM education. The lead investigators will use components of the research to teach at university levels, as well as in museum, and community outreach. Ties will be established and strengthened among all participant institutions, which includes an Historically Black University, as well as international partners. This research will help ignite the research careers of three young investigators (2 with no prior NSF support). Data will be archived and shared via publications, and web-accessible tools.

合作研究：调查已故俄克拉荷马大学的已故古生物学和古气候后果地质数据表明，柏油薄荷岛（3亿年前）期间的热带气氛是粉尘丰富的。此外，藻类在晚期海洋生态系统中占主导地位。这些观察结果，加上气候建模的预测，促使两个推动拟议研究的架构假设：1）异常的热带尘土粉尘反映了热带高地冰川的粉尘产生，以及2）大气尘土飞扬的污染物污染物污染的海洋生态系统。尘埃通过影响辐射强迫和大气水分和影响生物圈来迫使气候系统，但这些影响鲜为人知。在这项研究中，PI将收集数据以限制空间（低中度的纬度）和时间（冰川间 - 冰期和更长的时间）的变化，大气“灰尘”的来源，灰尘的来源，以及灰尘和生态系统组成之间的影响，以解决其超大的假设，并阐明大气尘埃的粉尘，气候，环境，环境，环境。气候和冰屋内的生物圈，在冰川冰川尺度上。由于已知的重要性，但对尘埃对气候的直接和间接影响的极大不确定性，结果将扩大对地球系统行为的理解。低海拔的热带冰川冰期比目前所接受的更广泛的冰川，如果经过验证 - 将迫使社区通过新的建模方法检验这一假设。要使用的模型与用于当前和未来气候的模型相同，因此通过拟议的工作进行的改进将为地球气候的建模提供信息。如果确认大气中的尘土迫使海洋生物系统迫使海洋生物系统进入营养丰富的条件的假设，则意味着尘土飞扬的地球，并阐明了地球系统的行为对粉尘采购的施肥。这些结果与关于地理工程计划的讨论不断增加，以控制未来的气候变化。通过地质和地球化学实验室，地质学家和建模者之间的交流以及在联合现场旅行和进步会议中，将进行更广泛的影响力训练培训。博士生将通过正式的夏季计划指导中学老师。本科生将在本科研究日和全国会议上进行高级论文，并出席。两者都将通过正式的STEM教育课程与中学和高中生互动。首席调查人员将使用研究的组成部分在大学级别，博物馆和社区外展教授。在包括历史悠久的黑人大学以及国际合作伙伴在内的所有参与者机构中，将建立和加强联系。这项研究将有助于点燃三名年轻研究者的研究职业（2个没有NSF支持）。数据将通过出版物和可访问的工具进行存档和共享。