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Multi-centennial fluctuations of radionuclide production rates are modulated by the Earth’s magnetic field

AuthorsPavón-Carrasco, Fco. Javier; Gómez-Paccard, Miriam ; Campuzano, S. A. ; González-Rouco, J. F. ; Osete, María Luisa
Issue Date11-Dec-2017
CitationAGU Fall Meeting (2017)
AbstractThe production of 14C and 10Be cosmogenic isotopes offer a unique way to reconstruct solar activity during the Holocene. This production is influenced by both solar and Earth magnetic fields and thus their combined effect needs to be disentangled to reconstruct past solar irradiance. Nowadays, it assumes that the long-term variations of production is modulated by the geomagnetic field and the solar field dominates shorter wavelengths. In this process, the effect of the wandering of the Earth’s magnetic poles is considered negligible. Here we revaluate these assumptions and demonstrate that the geomagnetic field exerts a strong modulation of multi-centennial to millennial wavelengths (periods of 800 and 2200 yr) that have so far been wrongly assigned to solar activity. Moreover, we demonstrate that the motion of the Earth’s magnetic poles produce differences of up to 35% in production at mid-latitudes. The results are supported by the identification, for the first time, of robust coherence between the production derived from geomagnetic reconstructions and that from natural archives. Our results imply a revision of the past solar forcing, with implications both for the assessment of solar-climate relationships and for the forcing conditions used in the present and future generation of paleoclimate models.
DescriptionTrabajo presentado en el AGU (American Geophysical Union) Fall Meeting: Advancing Earth and Space Science, celebrado en New Orleans. (Estados Unidos), del 11 al 15 de diciembre de 2017
Appears in Collections:(IGEO) Comunicaciones congresos
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