Temperature Reconstruction by Stable Isotope Analysis of Ice Cores from the Poles to the Tropics

这项提案寻求50%的配套资金，以获得两台新的质谱仪。迫切需要增加两个新的质谱仪，原因有三个。首先，俄亥俄州立大学明年将从三个新资助的钻探项目(美国国家科学基金会、美国国家海洋与大气局和美国宇航局)获得至少1500米的额外冰芯：在喜马拉雅南部中国的达苏普、玻利维亚的萨贾马和俄罗斯北极高原的格雷厄姆·贝尔岛。为产生高时间分辨率记录(如可能的年度记录)而测量的样本数量将大大超过已过时7年的质谱仪的能力。其次，如果结合(18(D)和(D)进行测量，则可以从冰芯样品中收集到更多的环境信息(例如，相对湿度的估计和水汽来源变化的迹象)。第三，目前所有已知的热带冰川和冰盖都在因最近的变暖而退缩，这种变暖在对流层中层(赤道30度和30度之间)尤为明显，不久将大力恢复这些濒危的档案。俄亥俄州立大学核心研究小组已证明有能力从偏远和恶劣的环境中提取岩芯，提取一系列古气候信息，并将结果发表在主要的同行评议期刊上。正如提案中讨论的，俄亥俄州立大学的同位素结果支持了一种新的观点，即热带地区在最后一次冰川阶段比之前认为的要冷得多，并强烈表明最近高海拔地区，特别是热带地区的气候变暖。提出的质谱仪计划将使俄亥俄州立大学冰芯研究计划为了解地球气候系统做出更大贡献。

This proposal seeks 50% matching funds to acquire two new mass spectrometers. The need to add two new mass spectrometers is urgent for three reasons. First, in the next year Ohio State University will acquire at least 1500 meters of additional ice core from three newly funded (NSF, NOAA and NASA) drilling projects: on Dasoupu in the southern Himalaya of China, on Sajama in Bolivia, and on Graham Bell Island in the high Russian Arctic. The number of samples to be measured to produce high temporal resolution records (e.g., annual where possible) will greatly exceed the capability of the 7-year old obsolete mass spectrometer. Secondly, substantially more environmental information (e.g., estimates of relative humidity and indications of moisture source changes) can be gleaned from ice core samples if the deuterium/hydrogen ratio ((D) is measured in combination with (18(. Thirdly, at this time all known tropical glaciers and ice caps are retreating in response to the recent warming which is particularly evident in the middle troposphere between (30o of the equator and soon there will be a major push to recover these endangered archives. The Ohio State University Core Research Group has the demonstrated ability to retrieve cores from remote and harsh environments, to extract a spectrum of paleoclimatic information, and publish the results in major peer-reviewed journals. As discussed in the proposal, the Ohio state University isotopic results have contributed to the emerging view that the tropics were much colder during the Last Glacial Stage than previously thought and strongly suggest a recent warming at high elevations, particularly in the tropics. The proposal mass spectrometers will enable the Ohio State University Ice Core Research Program to make even stronger contributions to the understanding of the Earth's climate system.