Characterization of in situ cosmogenic 14CO in glacial ice and applications of ice core 14CO as a tracer

Abstract:

Carbon-14 (14 C) is included in glacial ice via trapping of air and in situ cosmogenic production. In the carbon monoxide phase (14 CO), ice core 14 C has two promising applications. First, the trapped atmospheric component of 14 CO has the potential to serve as a tracer of past hydroxyl radical (OH) abundance and variability. Second, the in situ cosmogenic component can in principle be used to reconstruct variations in the past flux of galactic cosmic rays. A detailed understanding of the in situ cosmogenic 14 CO production and retention in ice is needed to disentangle the trapped atmospheric and in situ cosmogenic components in measurements of ice core 14 CO. We will present the most recent interpretations of ice core 14 CO measurements from Taylor Glacier, Antarctica and Summit, Greenland. Taylor Glacier is an ablation site with easily accessible ancient (> 50 kyr) ice at the surface that allows for the …

Año de publicación:

2020

Keywords:

Fuente:

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