Low time resolution analysis of polar ice cores cannot detect impulsive nitrate events

• Main Authors: Smart, D. F., Shea, M. A., Melott, A. L., Laird, C. M.
• Format: Text
• Language: unknown
• Published: arXiv 2015
• Subjects: Geophysics physics.geo-ph; High Energy Astrophysical Phenomena astro-ph.HE; Solar and Stellar Astrophysics astro-ph.SR; Atmospheric and Oceanic Physics physics.ao-ph; Space Physics physics.space-ph; FOS Physical sciences; Greenland; Ice Sheet
• Online Access: https://dx.doi.org/10.48550/arxiv.1501.01204; https://arxiv.org/abs/1501.01204

Ice cores are archives of climate change and possibly large solar proton events (SPEs). Wolff et al. (2012) used a single event, a nitrate peak in the GISP2-H core, which McCracken et al. (2001a) time associated with the poorly quantified 1859 Carrington event, to discredit SPE-produced, impulsive nitrate deposition in polar ice. This is not the ideal test case. We critique the Wolff et al. analysis and demonstrate that the data they used cannot detect impulsive nitrate events because of resolution limitations. We suggest re-examination of the top of the Greenland ice sheet at key intervals over the last two millennia with attention to fine resolution and replicate sampling of multiple species. This will allow further insight into polar depositional processes on a sub-seasonal scale, including atmospheric sources, transport mechanisms to the ice sheet, post-depositional interactions, and a potential SPE association. : 22 pages, 7 figures in Journal of Geophysical Research: Space Physics 119, 2014