EAR-PF: CENOZOIC HISTORY OF POLAR AMPLIFICATION IN SOUTH-CENTRAL ALASKA

David Colwyn博士被授予NSF EAR博士后奖学金，在科罗拉多大学博尔德分校开展研究和教育计划。调查的重点是高纬度地区的变暖幅度是低纬度地区的三倍。这个想法将被阿拉斯加中南部的新生代（过去6600万年）陆地古气候记录所检验。这些记录将用于评估阿拉斯加中南部在新生代期间的温度和水文变化，并将与更丰富的低纬度数据进行比较，以更好地了解高纬度地区陆地变暖放大的幅度和机制。了解控制高纬度气候变化的过程使科学家能够更准确地预测高纬度气候变化，并使阿拉斯加及其社区能够更有效地规划未来的气候。拟议的研究将与阿拉斯加（实地地区）和科罗拉多州（主办机构所在地）的中学科学教室的教学相结合，本科生将参与实地研究活动。这一假设将用来自阿拉斯加中南部的新的多代理古新世-上新世陆地古气候时间片进行检验。这些记录将用于评估阿拉斯加中南部在新生代期间的温度和同位素水文变化，并将与更丰富的低纬度数据进行比较，以更好地了解高纬度地区陆地气候变化放大的幅度和机制。具体来说，这种极地放大现象传统上被认为与冰反照率反馈有关；如果这是真的，那么这个想法要求极地放大将仅限于冰窖气候状态。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

Dr. David Colwyn has been granted an NSF EAR Postdoctoral Fellowship to carry out research and education plans at the University of Colorado - Boulder. The investigation will focus on warming in high latitudes increasing three times the magnitude as observed in lower latitudes. This idea will be tested with new Cenozoic (the last 66 million years) terrestrial paleoclimate records from south-central Alaska. These records will be used to assess how temperature and hydrology have changed in south-central Alaska during the Cenozoic, and will be compared with more abundant lower-latitude data to better understand the magnitude and mechanism(s) of amplification of terrestrial warming at high latitudes. Understanding the processes that control high-latitude climate variability enables scientists to more accurately forecast high-latitude climate variability and allows Alaska and its communities to more effectively plan for the climate of the future. The proposed research will be integrated with teaching in secondary school science classrooms in Alaska (the field area) and Colorado (the location of the host institution) and undergraduate students will be involved in the field research activities. The hypothesis will be tested with new multi-proxy Paleocene-Pliocene terrestrial paleoclimate time slices from south-central Alaska. These records will be used to assess how temperature and isotope hydrology have changed in south-central Alaska during the Cenozoic, and will be compared with more abundant lower-latitude data to better understand the magnitude and mechanism(s) of amplification of terrestrial climate change at high latitudes. Specifically, this phenomenon of polar amplification has been traditionally linked to ice-albedo feedback; if true, this idea requires that polar amplification would be limited to icehouse climate states.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.