Solar Modulation of Terrestrial 14C Production During the Little Ice Age and Medieval Warm Epoch (Solar Wind, Flares and Irradiance)

小冰期和中世纪暖期期间陆地 14C 产生的太阳调节（太阳风、耀斑和辐照度）

• 批准号: 8919535
• 负责人: Paul Damon
• 金额: $ 15.84万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1993-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8919535&HistoricalAwards=false
• 关键词: Solar; Modulation; Terrestrial; 14C; Production

The solar activity-radiocarbon-climate relationship of the Little Ice Age, a period of low solar activity, will be compared with that of the Medieval Warm Epoch, a period of low solar activity. Additionally, USSR data of Kocharov, which suggested a 20% fluctuation in C14 content of tree rings with an 18 year period (and no 11 year cycle) during the Maunder minimum, will be evaluated. Computer modelling will also be performed to test the stationality of the C14 periodicity over the 10 millennium record, to examine periods not yet studied but which appear in the power spectra, and to determine if the relationships between the C14 record and delta O18 signals from the Greenland ice cores are also evident in the delta O18 record of Antarctic ice cores. The work will include high-precision C14 analysis using liquid scintillation spectrometry of single-year tree-ring samples for the time periods in question. ***

太阳活动-放射性碳-气候关系 小冰河时期，一个太阳活动较低的时期， 与中世纪暖期，一个低太阳能的时期 活动 此外，苏联的科恰洛夫数据，这表明， 18年年轮中C14含量波动20% 在蒙德极小期期间（没有11年周期）， 评估。 此外，亦会进行电脑模拟，以测试 C14周期在10000年内的稳定性 记录，检查尚未研究但出现在 功率谱，并确定 来自格陵兰冰芯的C14记录和δ O 18信号 在南极冰芯的三角洲O 18记录中也很明显。 这项工作将包括使用液体的高精度C14分析， 一年年轮样品的闪烁光谱测定法 所涉及的时间段。***