CAREER: A Model-Based Rosetta Stone to Decipher the Stratigraphic Expression of Glacial Isostasy

事业：基于模型的罗塞塔石碑破译冰川均衡的地层表达

基本信息

批准号：
2046244
负责人：
Jessica Creveling
金额：
$ 67.67万
依托单位：
Oregon State University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-06-15 至 2026-05-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2046244&HistoricalAwards=false
关键词：
CAREER Model Based Rosetta Stone

项目摘要

Rising sea levels will be among the most severe impacts of a warming climate on society. To assess the sensitivity of polar ice caps and sea-level change to increase in temperatures, this CAREER award examines how sediments accumulating on the shallow seafloor archive sea-level change. As ice sheets melt, the earth’s surface bends predictably in response to the shrinking weight of the ice sheets and ocean waters flooding continent edges. This bending causes local sea-level change to differ from the rise predicted if melt water evenly filled the world’s oceans, like a bathtub. The sea-level rise in response to a melting ice sheet will differ across the globe, with some sediment archives retaining a more accurate measure of sea-level change than others. This research will use computer models to make global maps of differences in sea-level change for two past geological epochs with temperatures higher than 21st century projections. Such maps will clarify the circumstances for which geologists can leverage the apparently different magnitudes of sea-level change from sediment archives around the globe to provide more accurate reconstructions of past ice sheet melt location and scale. This project advances climate understanding by creating a ‘Rosetta Stone’ to decode the magnitude of ancient sea-level change retained in coastal geology of past warm periods so as to refine future sea level projections. The integrated education plan will generate novel curriculum on the science and ethics of sea-level change to inspire university students to participate in a growing workforce addressing sea level projection and mitigation. The education plan will engage non-STEM undergraduates to create and disseminate artistic outreach products explaining geographic differences in sea-level change to the public.Collaboration between solid earth geophysicists and Quaternary stratigraphers has revealed that glacial isostatic adjustment (GIA) concurrently creates and destroys accommodation, such that the stratigraphic record of glacial–interglacial cycles should appear different from place to place; in turn spatial differences in contemporaneous local sea level deduced from the stratigraphic archive should provide insight into the magnitude and melt source of a deglaciation. This proposal undertakes numerical GIA simulations to ‘fingerprint’ spatial deviations from glacioeustasy for literature-proposed magnitudes and melt sources for the mid-Pliocene warm period and the Oligocene inception of the Antarctic ice sheet. These spatially variable sea-level records will then serve as inputs into a software that models how sedimentation and subsidence modulate how GIA manifests in stratigraphy. The results will serve to decode spatial patterns in sea level retained in ice-age stratigraphy applicable across the geological timescale.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.

海平面上升将是温暖气候对社会的最严重影响之一。为了评估极地冰盖和海平面变化对升高温度的敏感性，该职业奖项考试如何在浅层海底档案海平面变化上积累沉积物。随着冰盖融化的融化，地球表面可以预见，响应着冰盖和海水泛滥的大陆边缘的减少。这种弯曲会导致当地的海平面变化与预测的上升，如果融化的水像浴缸一样均匀地融化了世界的海洋。响应融化冰盖的海平面上升将在全球范围内有所不同，其中一些沉积物档案保留了比其他档案更准确地测量海平面变化。这项研究将使用计算机模型来制作两个过去的地质时代的海平面变化差异的全球图，温度高于21世纪。这样的地图将阐明地质学家可以利用与全球沉积物档案的海平面变化显然不同的幅度的情况，以提供对过去冰盖融化的位置和规模的更准确的重建。该项目通过创建“ Rosetta Stone”来解码在过去温暖时期的沿海地质中保留的古老海平面变化的幅度，从而提高了气候理解，从而改善了未来的海平面项目。综合教育计划将为海平面变革的科学和伦理学生成新的课程，以激发大学生参与不断增长的劳动力，以解决海平面的预测和缓解措施。该教育计划将吸引非肢体大学生，以创建和传播艺术外展产品，解释了海平面上的地理差异的公众变化。固体地球地球物理学家和Quaternary Stratigraphers之间的集中式化，这表明冰川静脉内静态调整（GIA）同时创造并破坏了层次的差异，并脱离了层次的差异。反过来，从地层档案中得出的当代当地海平面上的空间差异应提供对脱气的大小和熔体来源的见解。该提案对数字GIA模拟进行了数字模拟，以“指纹”的空间偏离文学作品的震颤，并在plyecere冰盖的中新世中期温暖时期和渐新世开始的文学量和融化来源。然后，这些在空间上可变的海平面记录将作为一种输入，以模拟沉积和沉降如何调节GIA如何在层学中表现出来的软件。该结果将有助于解释适用于地质时间尺度的冰河分层中的海平面的空间模式。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，被认为是通过评估来获得的支持。