1. Nitrate abundance in polar ice during the great solar activity minimum
- Author
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Gladysheva, O.G., Kocharov, G.E., Kovaltsov, G.A., and Usoskin, I.G.
- Subjects
- *
NITRATES - Abstract
In the present paper we study variations of the nitrate content in Greenland ice core for the last 400 years. These data were obtained by high-precision measurements performed by the University of Kansas. It is shown that approximately 20-year periodicity dominates in the nitrate series during the Maunder minimum (1645-1715) due to similar variations of galactic cosmic ray intensity. During times of normal high solar activity level, the 4–6-year periodicity dominates in the nitrate series. This is probably due to a superposition of fluxes of galactic and solar cosmic rays, and due to the creation of favourable conditions for the nitrate precipitation. [Copyright &y& Elsevier]
- Published
- 2002
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