The paper also shows that solar activity at the end of the record in the 20th century was at the highest levels of the past 3,500 years. The paper joins many others finding potential solar amplification mechanisms related to the hydrological cycle, and to ocean & atmospheric oscillations.
Wednesday, November 5, 2014
New paper finds another potential solar amplification mechanism via ocean & atmospheric oscillations
A paper published today in Palaeogeography, Palaeoclimatology, Palaeoecology finds extreme flooding in the Amazon 2700 years ago was related to a sharp decrease of solar activity. According to the authors, the low solar activity of the 2700 year ago event "has been also observed in other sites in South America and other regions in the world, although different impacts can be observed in each system."
The authors postulate the very low solar activity 2700 years ago "seems to have provoked cooling on the continents and a southward shift of the ITCZ [Intertropical Convergence Zone] associated with a probable reduction in the Atlantic Meridian Overturning Circulation [AMOC]" ocean oscillation, and in-turn associated with extreme flooding in the Amazon.
Posted by MS at 4:29 PM