Marine Test of the Sensitivity of Ice Streams Entering Baffin Bay to Ocean Warming from LGM through Deglaciation, with an Emphasis on Central West Greenland Ice Streams
进入巴芬湾的冰流对末次盛冰期通过冰消作用导致海洋变暖的敏感性的海洋测试,重点是格陵兰岛中西部冰流
基本信息
- 批准号:1203492
- 负责人:
- 金额:$ 37.27万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2012
- 资助国家:美国
- 起止时间:2012-04-15 至 2016-03-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The proposed research will evaluate how ocean warming contributed to past ice sheet dynamics through study of the Last Glacial Maximum (LGM) through early Holocene behavior of ice streams draining into Baffin Bay. This research will provide a new context for understanding ice sheet response to past warm periods, in particular, the Bølling/Allerod interstadial period, which hosted rapid sea level rise and abrupt climate warming after the LGM. At the LGM the Greenland Ice Sheet (GIS) was one of three large ice sheets terminating via large, fast flowing ice streams into Baffin Bay. This project willstudy the past history, dynamics, and ice-sheet ocean interactions in Baffin Bay, and the role of ocean warming in ice sheet demise, via multi-proxy analysis of existing (2008 and 2009) sediment cores from the West Greenland continental slope. Data from this proposal will be used to model freshwater flux from the ice streams, and will provide new information on what role the Greenland Ice Sheet played in past sea-level rise as the LGM ice sheet began to shed as much as 4.6 m of sea level equivalent. The research will test three hypotheses using foraminiferal faunas, sediment mineralogy, stable isotope analyses, stratigraphy of iceberg rafted detritus (IRD), and visible diffuse spectral reflectance data:1. The western margin of the GIS advanced during stadials and retreated during interstadials inresponse to the presence or absence of ocean warming via the West Greenland Current.2. Peaks of ice-berg rafted material (IRD) result from two distinct processes: Proximal IRD isderived from retreat of the GIS off the shelf edge, whereas distal IRD results from collapse of theLaurentide Ice Sheet and Innutian Ice Sheet/NW Greenland margins in northern Baffin Bay.3. Advection of warm water along the West Greenland margin causes enhanced melting ofnorthern Baffin Bay icebergs and sea ice at the polar front, forming an IRD belt along the W.Greenland margin, which preserves a record of ice sheet-discharge events under conditions ofocean warming. The GIS is losing mass in response to modern warming. It stores enough fresh water to raise global sea level by 6.5 m, making its sensitivity to warming a major societal concern. It is anticipated that the sensitivity and response of the GIS to past warming, which are the foci of this project, will help constrain projections of the future evolution of the GIS.
拟议的研究将评估海洋变暖如何通过研究末次冰期最大值(LGM)通过全新世早期的冰流排入巴芬湾的行为来促进过去的冰盖动态。这项研究将为理解冰盖对过去温暖时期的反应提供一个新的背景,特别是Bølling/Allerod interstadial时期,该时期在LGM之后主持了海平面快速上升和气候突然变暖。在末次盛冰期,格陵兰冰盖(GIS)是三个大型冰盖之一,通过大型快速流动的冰流终止于巴芬湾。该项目将研究过去的历史,动力学和冰盖海洋相互作用在巴芬湾,和海洋变暖在冰盖消亡中的作用,通过对西格陵兰大陆坡现有(2008年和2009年)沉积物岩心的多代理分析。该提案的数据将用于模拟冰流的淡水通量,并将提供关于格陵兰冰盖在过去海平面上升中所起作用的新信息,因为LGM冰盖开始下降高达4.6米的海平面当量。 本研究将使用有孔虫动物群、沉积物矿物学、稳定同位素分析、冰山筏状碎屑(IRD)地层学和可见光漫反射光谱数据来检验三个假设:1。GIS的西部边缘的进步,在stadials和退在interstadials响应的存在或不存在的海洋变暖通过西格陵兰电流。冰山筏状物质(IRD)的峰值来自两个不同的过程:近端IRD来自于GIS从陆架边缘的退缩,而远端IRD来自于巴芬湾北方的Laurentide冰盖和Innutian冰盖/西北格陵兰边缘的崩塌。沿西格陵兰边缘的暖水平流沿着导致巴芬湾北部冰山和极锋海冰的加速融化,形成沿西格陵兰边缘的IRD带,该带沿着保存了海洋变暖条件下冰盖释放事件的记录。由于现代气候变暖,GIS正在失去质量。它储存的淡水足以使全球海平面上升6.5米,使其对变暖的敏感性成为一个主要的社会问题。预计地理信息系统对过去变暖的敏感性和反应(这是本项目的重点)将有助于限制对地理信息系统未来演变的预测。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Anne Jennings其他文献
Retreat of the Boothia-Lancaster ice stream from its Last Glacial Maximum extent and its role in the origin of Baffin Bay Detrital Carbonate (BBDC) events 0, 1 and 2
布西亚 - 兰开斯特冰流从末次盛冰期范围退缩及其在巴芬湾碎屑碳酸盐(BBDC)事件0、1和2起源中的作用
- DOI:
10.1016/j.quascirev.2025.109353 - 发表时间:
2025-06-15 - 期刊:
- 影响因子:3.300
- 作者:
Anne Jennings;Kimberley Jenner;Alexandre Normandeau;Wendy Roth;John Andrews;Robert Kelleher;Juliette Girard;Brendan Reilly;Calvin Campbell;Robbie Bennett - 通讯作者:
Robbie Bennett
Identification of Cryptococcus neoformans in a routine clinical laboratory
- DOI:
10.1007/bf02050740 - 发表时间:
1968-10-01 - 期刊:
- 影响因子:2.900
- 作者:
Anne Jennings;J. E. Bennett;Viola Young - 通讯作者:
Viola Young
Anne Jennings的其他文献
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{{ truncateString('Anne Jennings', 18)}}的其他基金
Collaborative Research: Spatiotemporal observations of the demise of an ice sheet: Paleo perspectives from Baffin Bay, West Greenland.
合作研究:冰盖消亡的时空观察:西格陵兰巴芬湾的古视角。
- 批准号:
2112547 - 财政年份:2022
- 资助金额:
$ 37.27万 - 项目类别:
Continuing Grant
Timing and Paleoceanographic Impacts of the Onset of Arctic-Baffin Bay Throughflow
北极-巴芬湾穿流发生的时间和古海洋学影响
- 批准号:
1804504 - 财政年份:2018
- 资助金额:
$ 37.27万 - 项目类别:
Standard Grant
Collaborative Research: Petermann Gletscher, Greenland - Paleoceanography and Paleoclimatology
合作研究:Petermann Gletscher,格陵兰岛 - 古海洋学和古气候学
- 批准号:
1417784 - 财政年份:2014
- 资助金额:
$ 37.27万 - 项目类别:
Standard Grant
High Northern Latitude Linkages between Atlantic Water, DSOW Formation and GIS Stability during the Holocene
全新世期间北高纬度大西洋水、DSOW 形成和 GIS 稳定性之间的联系
- 批准号:
0823535 - 财政年份:2008
- 资助金额:
$ 37.27万 - 项目类别:
Standard Grant
Marine Evidence for GIS Stability and History of Jakobshavn Isbrae, West Greenland, from the LGM to Holocene
西格陵兰岛雅各布港伊斯布拉 (Jakobshavn Isbrae) 从末次盛冰期到全新世的 GIS 稳定性和历史的海洋证据
- 批准号:
0713755 - 财政年份:2007
- 资助金额:
$ 37.27万 - 项目类别:
Standard Grant
Holocene Marine Climate Evolution and Variability from Multi-Proxy Analyses of High Resolution Shelf Cores in the Northern North Atlantic (West of 20W)
北大西洋北部(20W 以西)高分辨率陆架核心多代理分析的全新世海洋气候演化和变异
- 批准号:
0317832 - 财政年份:2003
- 资助金额:
$ 37.27万 - 项目类别:
Standard Grant
Ice-Ocean-Atmosphere Interactions Along the East Greenland Margin on Decade to Century Timescales Over the Last 14 ka
过去 14 ka 十年至世纪时间尺度上格陵兰岛东部边缘的冰-海-大气相互作用
- 批准号:
0082347 - 财政年份:2000
- 资助金额:
$ 37.27万 - 项目类别:
Standard Grant
Late Quaternary Ice Sheet Extent, Chronology, and Paleoceanography, East Greenland Margin/Denmark Strait: Implictions for the Arctic and North Alantic Oceans
晚第四纪冰盖范围、年代学和古海洋学,东格陵兰边缘/丹麦海峡:对北冰洋和北大西洋的影响
- 批准号:
9707161 - 财政年份:1997
- 资助金额:
$ 37.27万 - 项目类别:
Standard Grant
Support for a Coring Cruise to the East Greenland Continental Margin and Denmark Strait, and Preliminary Data Analysis
支持前往东格陵兰大陆边缘和丹麦海峡的取芯巡航及初步数据分析
- 批准号:
9615935 - 财政年份:1996
- 资助金额:
$ 37.27万 - 项目类别:
Standard Grant
The Final Stages of a Collapsing Marine Ice Sheet: Late Glacial Sediment Fluxes, Paleoceanography and Chronology: Hudson Strait and Adjoining Shelf, Canada
海洋冰盖崩塌的最后阶段:晚冰期沉积物通量、古海洋学和年代学:加拿大哈德逊海峡和毗邻陆架
- 批准号:
9224251 - 财政年份:1993
- 资助金额:
$ 37.27万 - 项目类别:
Continuing Grant
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