Oxygen Isotope Record from McMurdo Dome and its Relation to the Geological Climate Record of the Dry Valleys

麦克默多圆顶的氧同位素记录及其与干谷地质气候记录的关系

• 批准号: 8915924
• 负责人: Minze Stuiver
• 金额: $ 123.56万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-15 至 1997-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8915924&HistoricalAwards=false
• 关键词: Oxygen; Isotope; Record; McMurdo; Dome

This proposed research will obtain a stable isotope climate record covering the Holocene (the last 10,000 years) and the last part of the last glaciation from a small ice dome near the head of Taylor Valley, South Victoria Land ("McMurdo Dome" about 77 40' to 77 50'S, 158 10' to 159 20'E). An independent time scale will be derived from an ice-flow model adjusted to the depth of the glacial-interglacial transition and to oxygen isotope-derived variations in accumulation rate down the core. Comparison of this isotope proxy climate record with a radiocarbon-dated proxy record of climate, derived from perched deltas, strandlines and moraines, in the nearby Dry Valleys allows a dual approach that could be crucial for the interpretation of both the oxygen isotope fluctuations observed in ice cores during the Holocene and the lake levels and ice margin positions during this time span. The location of the dome, just west of the Transantarctic Mountains, is expected to have been sensitive to changes in ice cover of the Ross Sea, but protected against direct influences of glacial-interglacial sea level rise. The dome's isotope record may, when compared with the Dry Valley glacial record, and with long East and West Antarctic isotope profiles from ice cores at Vostok, Dome C and Byrd Station will reveal the response of the East and West Antarctic Ice Sheets to the glacial-interglacial temperature increase and sea level rise.

这项拟议的研究将获得一个稳定的同位素气候 记录覆盖全新世（过去10，000年）和 最后一次冰河时期的最后一部分， 南维多利亚地泰勒谷（“麦克默多 圆顶”约77 40'至77 50'S，158 10'至159 20 'E）。 一个 独立的时间尺度将从冰流中导出 模型根据冰川-间冰期的深度进行调整 过渡和氧同位素衍生的变化， 核心的累积率。 这种同位素的比较 具有放射性碳年代测定代用记录的代用气候记录 气候，来自栖息的三角洲，海岸线和 冰碛，在附近的干谷允许一个双重的方法 这对解释这两个问题至关重要， 冰核中观测到的氧同位素波动 全新世和全新世的湖面和冰缘位置 这个时间跨度。 穹顶的位置，就在泛南极洲的西边 山，预计一直敏感的变化， 罗斯海的冰盖，但保护免受直接 冰川-间冰期海平面上升的影响。 的 圆顶的同位素记录与干谷相比 冰川记录，并与长期东，西南极 来自东方、冰穹C和伯德冰芯的同位素剖面 车站将揭示东西方的反应 南极冰盖对冰川间冰期温度的影响 增加和海平面上升。