Climate and Cosmic Ray Flux Coupled Models for Tropospheric Fallout of Cosmogenic 10Be, 36 C1 and 26 A1: Understanding their Archival Records in Polar and Temperate Ice Cores

宇宙成因 10Be、36 C1 和 26 A1 对流层沉降物的气候和宇宙线通量耦合模型：了解它们在极地和温带冰芯中的档案记录

• 批准号: 9905467
• 负责人: Devendra Lal
• 金额: $ 7.34万
• 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=9905467&HistoricalAwards=false
• 关键词: Climate; Cosmic; Ray; Flux; Coupled

AbstractThis proposal requests funds to earn out the following investigations: (1) to measure the concentrations of cosmogenic radionuclide 26Al (half-life = 0.7 my) in several composite Arctic and Antarctic Holocene and glacial period ice samples, along with the concentrations of the two other cosmogenic nuclides 10Be (half-life = 1.5 my) and 36Cl (half-life = 0.3 my), and (2) to develop coupled cosmic ray-atmospheric circulation and aerosol scavenging models which can adequately' predict the tropospheric fallout of these nuclides. The proposed work is intended to show that (i) measurements of 26Al, which require large ice samples can be made using the available Arctic and Antarctic ice samples, by combining several sections, covering' tine periods of 500-1000 years. and that (ii) these measurements would be extremely valuable for understanding the nature of fallout of cosmogenic nuclides. The modeling effort will develop the coupled models taking into account all available data on the cosmic ray source function and its expected variability, seasonal variations in the last 30 years bused on the re-analysis global climatological data, and data' on the fallout of the three cosmogenic nuclides.

本提案要求提供资金，以开展以下调查：（1）测量宇宙成因放射性核素26 Al的浓度（半衰期= 0.7 my），沿着另外两种宇宙成因核素10 Be的浓度（2）建立宇宙线-大气环流和气溶胶清除耦合模型，以充分预测这些核素在对流层的沉降。（1）需要大量冰样的~（26）Al的测量可以利用现有的北极和南极冰样，通过结合几个剖面，覆盖500-1000年的时间段。（ii）这些测量对了解宇宙成因核素沉降物的性质极为宝贵。建模工作将开发耦合模型，考虑到有关宇宙射线源函数及其预期变异性的所有可用数据、基于重新分析全球气候数据的过去30年的季节变化以及有关辐射的数据。三种宇宙成因核素。