D and Deuterium Excess in the GISP2 Ice Core

该奖项是为了支持继续测量格陵兰冰盖项目二（GISP 2）冰芯样品中的氘。在GISP 2冰芯样品上测得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，以确定海洋湿气源的气候条件。 这项工作将与华盛顿大学的一个小组协调，该小组正在测量冰芯上的氧同位素比率。 迄今为止的工作表明，压力（北大西洋振荡）和温度（雅各布沙夫-奥斯陆跷跷板）振荡的记录记录在氘和氘过量值。 在末次冰期的氘过剩值显示急剧变化的时候，一些，但不是全部，大规模的冰山流入北大西洋（海因里希事件）。 要解决的主要问题包括在岩芯中测量的许多气候代用指标中看到的快速气候变化的性质，气候代用指标的首选状态所反映的气候模式的存在，以及各层不同的变薄和增厚对气候记录的重要性，以及近基底冰可能的折叠和断裂。

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.