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

摘要本提案要求资金用于开展以下调查：(1)测量了几个全新世和冰期复合北极和南极冰样中宇宙生成核素26Al（半衰期= 0.7 m）的浓度，以及另外两种宇宙生成核素10Be（半衰期= 1.5 m）和36Cl（半衰期= 0.3 m）的浓度；(2)建立了能够充分预测这些核素对流层沉降的宇宙射线-大气环流和气溶胶清除耦合模型。所提出的工作旨在表明(i)通过结合覆盖500-1000年时间的几个部分，可以利用现有的北极和南极冰样本进行26Al的测量，这需要大量的冰样本。(2)这些测量对于理解宇宙核素沉降物的性质非常有价值。建模工作将开发耦合模型，考虑到所有关于宇宙射线源函数及其预期变率的现有数据、基于重新分析的全球气候数据的过去30年的季节变化以及关于三种宇宙核素沉降物的数据。

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.