In-Depth Study of Cosmogenic in Situ 14CO, 14CO2 and Atmospheric CO2 in GISP II Firn and Ice

GISP II 冰和冰中原位 14CO、14CO2 和大气 CO2 宇宙成因的深入研究

• 批准号: 9321448
• 负责人: Devendra Lal
• 金额: $ 6.97万
• 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: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-01 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9321448&HistoricalAwards=false
• 关键词: Depth; Study; Cosmogenic; Situ; 14CO

This award is for support for a two year continuing grant to study the cosmogenic in-situ carbon-14 trapped in the GISP2 core. Total amounts of carbon-14 activities in the carbon monoxide (CO) and carbon dioxide (CO2) phases will be studied using previously developed techniques. New techniques will be developed for the measurements of carbon dioxide concentrations in ice using wet and dry extraction methods and of carbon-14 activities using a dry extraction procedure. By studying the total carbon-14 activities in ice samples of known age information on the dependence of retention of both atmospheric carbon dioxide and in-situ carbon-14 activities on the ambient temperatures will be determined. The proposed studies will provide an algorithm for using the hybrid carbon-14 chronometer (hybrid because carbon-14 is derived from two sources), and should allow accurate carbon-14 dating of other ice cores.

该奖项旨在支持为期两年的持续资助，以研究GISP 2核心中捕获的宇宙成因原位碳14。 将使用先前开发的技术研究一氧化碳（CO）和二氧化碳（CO2）相中的碳-14活度总量。 将开发新的技术，用湿和干提取法测量冰中二氧化碳的浓度，用干提取法测量碳-14的活性。 通过研究已知年龄的冰样中的总碳-14活性，将确定大气中二氧化碳和原地碳-14活性的保留对环境温度的依赖性的信息。 拟议的研究将提供一种使用混合碳-14计时器的算法（混合是因为碳-14来自两个来源），并应允许其他冰芯的准确碳-14定年。