Summer Sea Ice is Leaving the Arctic 30 Years Earlier than Expected James Overland NOAA/Pacific Marine Environmental Laboratory, Seattle WA.

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Presentation transcript:

Summer Sea Ice is Leaving the Arctic 30 Years Earlier than Expected James Overland NOAA/Pacific Marine Environmental Laboratory, Seattle WA

ARCTIC SEA ICE SUMMER MINIMUMS

Summer Sea Ice Extent

Major Loss of Multi-year (thick) Sea Ice between January 2004 and Satellite Data (QuickScat) From Ron Kwok (JPL)

Lessons Learned from 2008 *Summer 2008 was a second sequential summer of extreme minimum arctic sea ice extent. *Given typical future atmospheric conditions, it will be difficult for summer sea ice to return to its previous state of the 1980s *Not all of the first-year sea ice which formed in winter 2008 melted out in summer *Rather than being at a tipping point, it may take until the 2030s for a sea ice free summer Arctic. *This is still 30 years earlier than anticipated.

THE SUMMER ARCTIC ICE PACK IS MELTING AT A RATE THAT EXCEEDS MOST EXPECTATIONS WHY SO FAST? Anthropogenic (CO2) + Unusual (Natural Variability) Warm Climate Pattern the last 10 Years + Ice/ocean Feedbacks = NEW CLIMATE STATE (ONE WAY TRIP)

THE ARCTIC IS WARMING FASTER THAN ANYWHERE ELSE Projected Year for a Sea Ice Free Summer Arctic* From Combined Effects ~ 2035 From CO2 Influences Alone ~ 2065 * IPCC AR4 models that have good annual cycle of sea ice extents

BUT Bering Sea in winter does not show same early sea ice loss as the Summer Central Arctic Alaska

Lessons from 2008 It will be difficult for the arctic sea ice/climate system to return to its previous state. A continued rapid decline is also unlikely. We project a nearly sea-ice free September Arctic in the 2030s. Major Arctic sea ice loss is in late SUMMER and fall. Not SPRING. This is Occurring NOW in Alaska. Extends shipping and oil explorations season into November. Impacts summer biology of fisheries and certain marine mammals (Salmon, Polar Bears, Walrus)