Most of the 50 massive glaciers draped over the spine of the Patagonian Andes are shrinking in response to a global warming, said Andrés Rivera, a glaciologist at the Center for Scientific Studies in Valdivia, Chile.
But the Perito Moreno glacier in Argentina and Pio XI glacier in Chile are taking on ice, instead of shedding it.
"What is happening … is not well understood," Rivera said.
Theories center on the geography and topography of the glaciers; the depth and temperature of the waters where the glaciers end; and how quickly, or slowly, they react to changes in the climate.
Yet overall, "if you account for the gains and losses of all of Patagonia's glaciers, they are losing huge amounts of ice," Rivera pointe
| 
