Using Radiochemical Data from Collapsed Ice Shelf Sediments to Understand the Nature and Timing of the Benthic Response to High-Latitude Climate Change

利用崩塌冰架沉积物的放射化学数据了解底栖生物对高纬度气候变化响应的性质和时间

基本信息

批准号：
1341669
负责人：
David DeMaster
金额：
$ 44.96万
依托单位：
North Carolina State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2013
资助国家：
美国
起止时间：
2013-10-01 至 2017-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1341669&HistoricalAwards=false
关键词：
Using Radiochemical Data Collapsed Ice

项目摘要

Intellectual Merit: The PI requests support to analyze sediments from multi-cores and mega-cores previously collected from beneath the former Larsen B and Larsen A ice shelves. These unique cores will allow the PI to develop a time-integrated understanding of the benthic response to ice shelf collapse off the East Antarctic Peninsula over time periods as short as 5 years following ice shelf collapse up to 170 years after collapse. High latitudes are responding to climate change more rapidly than the rest of the planet and the disappearance of ice shelves are a key manifestation of climate warming. The PI will investigate the newly created benthic environments and associated ecosystems that have resulted from the re-initiation of fresh planktonic material to the sediment-water interface. This proposal will use a new geochemical technique, based on naturally occurring 14C that can be used to assess the distribution and inventory of recently produced organic carbon accumulating in the sediments beneath the former Larsen A and B ice shelves. The PI will couple 14C measurements with 210Pb analyses to assess turnover times for sedimentary labile organic matter. By comparing the distributions and inventories of labile organic matter as well as the bioturbation intensities among different locations as a function of time following ice shelf collapse/retreat, the nature and timing of the benthic response to ice shelf collapse can be assessed. Broader impacts: This study will provide important information characterizing changes occurring on the seafloor after the collapse of ice shelves. This research will support the research project of a graduate student. This project brings together researchers from both the European community and the LARISSA Project.

知识分子的优点：PI请求支持以分析先前从前拉尔森B和Larsen A冰架的多核和大型核心的沉积物。这些独特的核心将使PI能够在冰架倒塌后170年后短短5年，对冰片架对冰架倒塌的底栖反应有了时间的融合理解。高纬度比地球的其余部分更快地对气候变化的反应更快，而冰架的消失是气候变暖的关键体现。 PI将研究新创建的底栖环境和相关的生态系统，这些环境是由将新鲜浮游物质重新生成到沉积物 - 水界面所产生的。该提案将基于天然发生的14C使用新的地球化学技术，该技术可用于评估在前Larsen A和B冰架下方沉积物中积累的最近产生的有机碳的分布和清单。 PI将将14C测量与210pb分析相结合，以评估沉积不稳定有机物的周转时间。通过比较不稳定的有机物的分布和清单以及不同位置之间的生物扰动强度与冰架倒塌/撤退后的时间的函数，可以评估底栖对冰架倒塌的响应的性质和时机。更广泛的影响：这项研究将提供重要的信息，表征冰架倒塌后在海底发生的变化。这项研究将支持研究生的研究项目。该项目汇集了来自欧洲社区和拉里萨项目的研究人员。