D and Deuterium Excess in the GISP2 Ice Core

GISP2 冰芯中的 D 和氘过量

• 批准号: 9321564
• 负责人: James White
• 金额: $ 34.07万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-07-15 至 1998-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9321564&HistoricalAwards=false
• 关键词: Deuterium; Excess; GISP2; Ice; Core

This award is for support to continue measurements of deuterium on samples from the Greenland Ice Sheet Project Two (GISP2) ice core. The values of deuterium measured on the GISP2 ice core samples will be used to reconstruct and interpret the temperature history recorded in the core. Deuterium excess values will also be calculated in order to determine the climate conditions at the oceanic moisture source. This work will be coordinated with the group from the University of Washington that is measuring oxygen isotope ratios on the ice core. Work to date suggests that records of pressure (North Atlantic Oscillation) and temperature (Jakobshave-Oslo seesaw) oscillations are recorded in the deuterium and deuterium excess values. Values of deuterium excess during the last glacial period show sharp changes at the times of some, but not all, of the massive fluxes of icebergs into the North Atlantic ocean (Heinrich Events). Major questions to be addressed include the nature of rapid climate changes seen in many of the climate proxies measured in the core, the existence of modes of climate as reflected by preferred states of the climate proxies, and the importance for the climate record of differential thinning and thickening of layers, as well as possible folding and faulting of the near basal ice.

该奖项用于支持继续测量格陵兰冰盖项目二号 (GISP2) 冰芯样本中的氘。在 GISP2 冰芯样本上测量的氘值将用于重建和解释冰芯中记录的温度历史。 还将计算氘过量值，以确定海洋水分源的气候条件。 这项工作将与华盛顿大学测量冰芯氧同位素比率的小组协调进行。 迄今为止的工作表明，压力（北大西洋涛动）和温度（雅各布-奥斯陆跷跷板）振荡的记录记录在氘和氘过量值中。 末次冰河期的氘过量值在部分（但不是全部）冰山大量流入北大西洋时显示出急剧变化（海因里希事件）。 要解决的主要问题包括在核心测量的许多气候代理中看到的快速气候变化的性质、气候代理的首选状态所反映的气候模式的存在以及差异稀疏的气候记录的重要性层的增厚，以及近基底冰可能的折叠和断层。