Eight and a Half Centuries of Snowpack Variations in the Andes of Chile and Argentina
Masiokas, M.H., Villalba, R., Christie, D.A., Betman, E., Luckman, B.H., Le Quesne, C., Prieto, M.R. and Mauget, S. 2012. Snowpack variations since AD 1150 in the Andes of Chile and Argentina (30°-37°S) inferred from rainfall, tree-ring and documentary records. Journal of Geophysical Research 117: 10.1029/2011JD016748.
In describing their findigns, the eight researchers report that "variations observed in the last 60 years are not particularly anomalous when assessed in a multi-century context," noting that both extreme high and low snowpack values "have not been unusual when assessed in the context of the past eight centuries." Indeed, they say that "the most extreme dry decades are concentrated between the late 16th century and the mid-18th century," and that there were "decade-long periods of high snowpack levels that equaled or probably surpassed those recorded during the past six decades."
Contrary to the worries of climate alarmists, it would appear that there is nothing unusual, unnatural or unprecedented about the highs and lows of the Andean snowpack over the last six decades of global warming.