Atmospheric 14C, the Ocean, and the Sun

14C 大气、海洋和太阳

• 批准号: 9310121
• 负责人: Minze Stuiver
• 金额: $ 36万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-11-15 至 1998-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9310121&HistoricalAwards=false
• 关键词: Atmospheric; 14C; Ocean; Sun

ATM-9310121 Stuiver, Minze University of Washington Title: Atmospheric 14C the Ocean, and the Sun The 14C/12C ratios of atmospheric CO2 are quite variable as they reflect changes in 14C cosmic-ray production rate in the upper atmosphere, as well as climate-dependent re-allocation of 14C between the various earth carbon reservoirs. This award supports high-precision 14C measurements of early Holocene wood from the German Pine chronology which will contribute to an improved definition of the 14C/12C record back to 11,400 calendar years before the present. Causal factors for 14C/12C variability such as climate and solar influences will be identified and characterized with the aid of carbon reservoir modeling. Feedback mechanisms may play a role. High-precisionSeptember 27, 1993 measurements of materials of the current millennium will also be utilized to understand climatic factors. Regional 14C/12C differences and North - South latitudinal 14C/12C gradients will be defined. Incorporating the gradients into carbon reservoir models will lead to a better definition of carbon cycle sinks and sources.

大气中二氧化碳的14C/12C比值变化很大，因为它们反映了高层大气中14C宇宙射线产生率的变化，以及14C在地球不同碳库之间随气候变化的重新分配。该奖项支持对来自德国松树年表的早期全新世木材进行高精度的14C测量，这将有助于将14C/12C记录的清晰度提高到11,400历年之前。14C/12C变异性的原因因素，如气候和太阳影响，将借助碳库模拟来确定和表征。反馈机制可能起到一定作用。1993年9月27日对当前千年材料的高精度测量也将被用来了解气候因素。将确定区域14C/12C差异和南北纬度14C/12C梯度。将梯度纳入碳库模型将导致对碳循环汇和源的更好定义。