Late Quaternary History of the Western and East-Central Ross Sea, Antarctica: A Contribution to the West Antarctic Ice Sheet Initiative

南极洲西部和中东部罗斯海的晚第四纪历史：对南极西部冰盖计划的贡献

• 批准号: 9615046
• 负责人: Amy Leventer
• 金额: --
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-01 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9615046&HistoricalAwards=false
• 关键词: Late; Quaternary; History; Western; East; Late; Quaternary; History; Western; East

OPP 9614287 Andrews OPP 9615046 Leventer Abstract The late Quaternary extent and pattern of retreat of the West Antarctic Ice Sheet is an important control on interpretation of ice core records from the region and it has important ramification regarding the global water budget (in sea level terms), the timing of meltwater contributions to the ocean, and the synchrony (or lack thereof) between events in the Northern and Southern Hemispheres. This award supports continued research on the chronology of ice retreat from the western Ross Sea and an extension of areal coverage for this research to include the eastcentral Ross Sea. The study will use a series of piston, Kasten, and grab samples from research cruises in 1994 and 1995 on the RVIB N.B. Palmer by researchers from Rice University, University of Colorado, Boulder, and Hamilton College. Various physical and biological parameters of the cores will be used to map changes in the environments over time with a concentration on sediment properties, foraminifera, and diatoms. At this time, ninety-two carbon-14 dates (plus 18 pending dates, all based on acceleratormass-spectrometry) have been obtained from cores collected prior to 1994 and from the 1994 and 1995 cruises by the research groups at Hamilton College and the University of Colorado, Boulder. Emphasis will be placed on obtaining additional radiocarbon dates supplemented by several other chronological methods including: sources and ages of volcanic ashes, uranium-series dating of solitary corals, and amino acid racemization. The three major research questions are: 1) What was the position of the grounding line during the Last Glacial Maximum from the western to east-central Ross Sea and what was the timing of retreat from this limit, was it synchronous across the region, and what was the rate of retreat ? 2) Is there evidence from the history of carbonate accumulation on the outer shelf banks, and from cores on the slope of the Ross Sea that the ice was grounded on the shelf break at some time prior to marine isotope stage (MIS) 2, possibly at MIS 4 (Goodwin, person. commun. 1996)? 3) What are the paleoenvironments in the areas of the Ross Sea at the millenial/century time-scales during the latest Pleistocene and the Holocene? In particular, what is the history of changes in surface water productivity and sea ice extent?

OPP 9614287 Andrews OPP 9615046 Leventer摘要摘要的第四纪晚期和撤退模式是对该地区对冰核心记录的解释的重要控制，并且它对全球水预算（在海平面上）的重大影响（在海平面上），甲级水平的计时，材料对海洋和海洋的贡献（及其及其在此事件）和近距离派出了近距离的事件（及其近距离）。 该奖项支持对西罗斯海冰撤退的年表的持续研究，并为这项研究的覆盖范围扩展，其中包括东中心罗斯海。 该研究将在1994年和1995年在RVIB N.B.中使用一系列活塞，Kasten和抓取研究巡航的样品。帕尔默（Palmer）由莱斯大学，科罗拉多大学，博尔德大学和汉密尔顿学院的研究人员。 核心的各种物理和生物学参数将用于随着时间的推移绘制环境中的变化，集中于沉积物特性，有孔虫和硅藻。 目前，已经从1994年之前收集的核心获得了92个碳14日期（加18个待处理的日期，所有这些日期，所有这些日期），以及从1994年和1995年在汉密尔顿学院的研究小组和科罗拉多州科罗拉多大学的研究小组中获得的核心。将重点放在获得其他几种按时间顺序的方法中获得的其他放射性日期，其中包括：火山灰的来源和年龄，孤立珊瑚的铀系列日期和氨基酸种族化。 三个主要的研究问题是：1）在从西部到东部的罗斯海的最后一次冰川最大值中，接地线的位置是什么？从该限制中撤退的时机是什么，这是整个地区同步的，撤退的速度是多少？ 2）是否有证据表明，碳酸盐在外架库上积累的历史以及从罗斯海斜坡上的岩心在海洋同位素阶段（MIS）2（可能是MIS 4（Goodwin，goodwin，commun。Commun。996）之前的一段时间，冰扎在架子上的破裂上（MIS）2？ 3）在最新的更新世和全新世期间，千年/世纪时间尺度的罗斯海地区的古环境是什么？特别是，地表水生产率和海冰范围变化的历史是什么？