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

ATM-9707492 Nishiizumi，Kunihiko University of加州，Berkeley题目：GISP-II冰芯中的宇宙成因放射性核素10 Be，26 Al，and 36 Cl 该项目的目的是提供格陵兰山顶冰芯中宇宙成因放射性核素浓度的记录，作为GISP-II方案的一部分。 研究人员将测量整个200米浅冰芯中10 Be和36 Cl的年度剖面，该冰芯的时间跨度从现在到大约700年BP。 这些测量将完成整个3054米GISP-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。 由此产生的时间序列的核素浓度将被应用到三个主要的问题领域：推导出太阳活动的历史，推导出历史的变化，在地磁场，并详细比较10 Be，36 Cl的生产和14 C的配置文件。 宇宙成因放射性核素浓度将用于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）设施进行。 这项拟议的工作将与GISP-II的其他调查员协调进行。

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.