On possible drivers of Sun-induced climate changes |
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| Authors: | Cornelis de Jager Ilya Usoskin |
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| Institution: | aRoyal Netherlands Institute for Sea Research; P.O. Box 59, 1790 AB Den Burg, The Netherlands;bSodankylä Geophysical Observatory (Oulu Unit), 90014 University of Oulu, Finland |
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| Abstract: | We tested the validity of two current hypotheses on the dependence of climate change on solar activity. One of them states that variations in the tropospheric temperature are caused directly by changes of the solar radiance (total or spectral). The other suggests that cosmic ray (CR) fluctuations, caused by the solar/heliospheric modulation, affect the climate via cloud formation. Confronting these hypotheses with seven different sets of the global/hemispheric temperature reconstructions for the last 400 years, we found that the former mechanism is in general more prominent than the latter. Therefore, we can conclude that in so far as the Sun–climate connection is concerned tropospheric temperatures are more likely affected by variations in the UV radiation flux rather than by those in the CR flux. |
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| Keywords: | Climate variability Coronal mass ejections Interplanetary magnetic clouds Solar activity Sun– climate interaction Sunspot number |
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