Comment on “Low time resolution analysis of polar ice cores cannot detect impulsive nitrate events” by D.F. Smart et al.

Wolff, E. W.; Bigler, Matthias; Curran, M. A. J.; Dibb, J. E.; Frey, M. M.; Legrand, M.; McConnell, J. R. (2016). Comment on “Low time resolution analysis of polar ice cores cannot detect impulsive nitrate events” by D.F. Smart et al. Journal of Geophysical Research: Space Physics, 121(3), pp. 1920-1924. AGU Publications 10.1002/2015JA021570

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Smart et al. (2014) suggested that the detection of nitrate spikes in polar ice cores from solar energetic particle (SEP) events could be achieved if an analytical system with sufficiently high resolution was used. Here we show that the spikes they associate with SEP events are not reliably recorded in cores from the same location, even when the resolution is clearly adequate. We explain the processes that limit the effective resolution of ice cores. Liquid conductivity data suggest that the observed spikes are associated with sodium or another nonacidic cation, making it likely that they result from deposition of sea salt or similar aerosol that has scavenged nitrate, rather than from a primary input of nitrate in the troposphere. We consider that there is no evidence at present to support the identification of any spikes in nitrate as representing SEP events. Although such events undoubtedly create nitrate in the atmosphere, we see no plausible route to using nitrate spikes to document the statistics of such events.

Item Type:

Journal Article (Further Contribution)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

Bigler, Matthias

Subjects:

500 Science > 530 Physics

ISSN:

2169-9380

Publisher:

AGU Publications

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

12 Jul 2016 13:41

Last Modified:

01 Oct 2016 02:30

Publisher DOI:

10.1002/2015JA021570

BORIS DOI:

10.7892/boris.83954

URI:

https://boris.unibe.ch/id/eprint/83954

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