Cosmogenic Radionuclides in the GISP-II Ice Core: 10Be, 26Al, and 36Cl

题目：gsp - ii冰芯中的宇宙生成放射性核素10Be， 26Al和36Cl本项目旨在提供格陵兰峰顶冰芯中宇宙生成放射性核素浓度的记录，作为gsp - ii计划的一部分。研究人员将测量整个200米浅冰芯中10Be和36Cl的年剖面，这段时间跨度从现在到大约700年前。这些测量将完成整个3054 m gsp - ii冰芯的宇宙成因核素测量。极地冰芯中的宇宙成因放射性核素已被用于研究几个重要的地球物理变量的长期变化，包括：太阳活动、地磁场、大气环流、雪积累率等。得到的核素浓度时间序列将应用于三个主要问题领域：推断太阳活动的历史，推断地磁场的变化历史，以及对10Be、36Cl产量和14C剖面的详细比较。宇宙形成的放射性核素浓度将通过大气环流和大气化学对核素沉积的影响来研究气候历史。测量将在劳伦斯利弗莫尔国家实验室（LLNL）加速器质谱（AMS）设备上进行。这项拟议的工作将与其他第二期地理信息系统调查人员协调进行。

ATM-9707492 Nishiizumi, Kunihiko University of California, Berkeley Title: Cosmogenic Radionuclides in the GISP-II Ice Core 10Be, 26Al, and 36Cl This project is intended to provide a record of cosmogenic radionuclide concentrations in the Greenland summit ice cores as part of the GISP-II program. The investigators will measure annual profiles of 10Be and 36Cl in the entire 200 m shallow ice core which spans the time period from the present to about 700 years BP. These measurements will complete the cosmogenic nuclide measurements in the entire 3054 m GISP-II ice core. Cosmogenic radionuclides in polar ice cores have been used to study long-term variations in several important geophysical variables, including: solar activity, geomagnetic field, atmospheric circulation, snow accumulation rates, and others. The resulting time series of nuclide concentrations will be applied to three main problem areas: deducing the history of solar activity, deducing the history of variations in the geomagnetic field, and a detailed comparison of 10Be, 36Cl production and the 14C profile. Cosmogenic radionuclide concentrations will be used to study climate history through the effects of atmospheric circulation and of atmospheric chemistry on nuclide deposition. The measurements are to be carried out at the Lawrence Livermore National Laboratory (LLNL) accelerator mass spectrometry (AMS) facility. This proposed work will be undertaken in coordination with other GISP-II investigators.