Accumulation Histories of GISP2 Ice During the Last Glacial Period: Record Based on In-Situ Produced 14 C

末次冰期GISP2冰的堆积历史：基于原位产生的14 C记录

• 批准号: 9905299
• 负责人: Devendra Lal
• 金额: $ 3.91万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9905299&HistoricalAwards=false
• 关键词: Accumulation; Histories; GISP2; Ice; During

This research award seeks to obtain comprehensive information on the accumulation history of the GISP2 ice core, using a nuclear method based on in-situ 14C produced by cosmic rays in the firn "oxygen" during accumulation. This method was developed in a study of the well-documented Holocene of the GISP2 core, whose chronology and accumulation rates are fairly well constrained. This method allows characterization of ice accumulation rates in situations where reliable flow models cannot be constructed. The proponents seek to complete 14C analyses of several deep ice samples of ages 16-39 ky BP in hand, and also of ice samples which accumulated during special solar activity epochs. The first set of data would yield information on accumulation rates during the glacial period, while the second would shed light on the effects of changes in climate and cosmic ray fluxes during different solar activity levels.

该研究奖旨在利用基于宇宙射线在“氧”积累过程中产生的原位14C的核方法，获得关于GISP2冰芯积累历史的全面信息。该方法是在对GISP2岩心的全新世进行研究的基础上发展起来的，该岩心的年代学和积累速率都得到了很好的限制。在无法建立可靠的流动模型的情况下，这种方法可以表征冰积累速率。支持者们试图完成手头几个年龄在16- 39kbp的深层冰样本的14C分析，以及在特殊的太阳活动时期积累的冰样本。第一组数据将提供关于冰期积累速率的信息，而第二组数据将阐明在不同太阳活动水平期间气候变化和宇宙射线通量的影响。