Arctic Sea Ice Decline May Trigger Climate Change Cascade

25/03/2007

Arctic sea ice that has been dwindling for several decades may have reached a tipping point that could trigger a cascade of climate change reaching into Earth's temperate regions says a new University of Colorado at Boulder study. Mark Serreze a senior research scientist at CU-Boulder's National Snow and Ice Data Center who led the study synthesizing results from recent research said the Arctic sea-ice extent trend has been negative in every month since 1979 when concerted satellite record keeping efforts began. The team attributed the loss of ice about 38000 square miles annually as measured each September to rising concentrations of greenhouse gases and strong natural variability in Arctic sea ice.When the ice thins to a vulnerable state the bottom will drop out and we may quickly move into a new seasonally ice-free state of the Arctic Serreze said. I think there is some evidence that we may have reached that tipping point and the impacts will not be confined to the Arctic region.