Collaborative Research: Calibrating mid-Miocene greenhouse climate and ecology in a key high southern latitude locale

合作研究：校准南半球高纬度地区的中中新世温室气候和生态

• 批准号: 1349749
• 负责人: Matthew Kohn
• 金额: $ 9.9万
• 依托单位: Boise State University
• 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: 2014-04-01 至 2018-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1349749&HistoricalAwards=false
• 关键词: Collaborative; Research; Calibrating; mid; Miocene

Collaborative Research: Calibrating mid-Miocene greenhouse climate and e4cology in a key high southern latitude localeBy Matthew J. Kohn, Boise State University, EAR-1349749Richard Kay, Duke University, EAR-1349741Caroline Stromberg, University of Washington, EAR-1349530The mid-Miocene Climatic Optimum (MMCO; 14.5-17.0 million years ago, Ma) marks an unusually warm period in Earth?s history and is the last time that atmospheric CO2 content (pCO2) plausibly reached levels as high as anticipated in the next century. Thus the MMCO serves as our best analogue for predicting future greenhouse conditions. The proposed research will fill a major gap in the distribution of MMCO terrestrial localities by characterizing climates and ecologies of Earth?s southernmost site ? the Santa Cruz Formation of coastal Patagonia (51 °S). Previous work and models disagree in terms of mean annual temperature (MAT), mean annual precipitation (MAP) and the seasonality of precipitation. We will evaluate paleoecological and paleoclimate hypotheses regarding MAT, MAP and vegetation at two specific times: 17.45 (pre-peak MMCO) and 16.85 Ma (peak MMCO). Stable isotope compositions will be used to infer aridity and seasonality. Phytoliths (plant silica particles) will distinguish plant communities. Tooth wear and faunas will constrain habitat and climate. Our research will also intercompare diverse methods of inferring paleoecology and paleoclimate in terrestrial settings with broad implications for terrestrial climate intercomparisons worldwide. Dissemination and sharing of research results will comply with guidelines expressed in NSF13-1. A new exhibit will be constructed at the Burke Museum (annual visitation of c. 20,000 K-12 students, c. 75,000 total) on biotic responses to climate change, as well as accompanying web pages ("Explore Your World," "Burke Blog" entries) and social media (e.g., Facebook). Several graduate students will be supported, and new paleoclimate-paleoecology-paleontology networks among US and Argentine researchers will be initiated.

协作研究：在关键的高南纬度地区校准中新世温室气候和E4学位，Boise State University，Boise State University，EAR-1349749Richard Kay，Duke University，EAR-1349741 Caroline Stromberg，ear-1349530 ear-1349530 ear-1349530; MA）标志着地球历史上一个异常温暖的时期，大气二氧化碳含量（PCO2）的最后一次可能达到了下一个世纪所预期的高度。 MMCO是我们预测未来温室条件的最佳类似物。拟议的研究将通过表征地球最南端的气候和生态学来表征MMCO陆地地区分布的主要空白？沿海巴塔哥尼亚（51°S）的圣克鲁斯形成。先前的工作和模型在平均年温度（MAT），平均降水量（MAP）和降水季节性方面不同意。我们将在两个特定时间（17.45（Pre-prepeak MMCO）和16.85 MA（MMCO峰值）评估有关MAT，地图和植被的古生物学和古气候假设。稳定的同位素组成将用于推断干燥和季节性。植物石（植物二氧化硅颗粒）将传播，研究结果的共享将符合NSF13-1中表达的指南。将在伯克博物馆（C. 20,000 K-12学生的年度访问，总计约75,000名）对气候变化的生物反应以及参与网页（“探索您的世界”，“ Burke Blog”条目）和社交媒体（例如Facebook）上（例如，“探索您的世界”）和社交媒体。将支持几位研究生，并将启动我们中间的新古气候生态生物学网络和阿根廷研究人员。