10. Age of Arctic Sea Ice
1989 / 2007
+ 5 years − 5 years Ocean
11. … late summer sea-ice is
projected to disappear
almost completely
towards the end of the
21st century
IPCC, WG I (2007)
12.
13. “The Arctic Ocean could be nearly ice-free at the
end of summer by 2012”
Dr Jay Zwally, NASA
“Our projection of 2013 is already
too conservative.”
Dr Wieslaw Maslowski, US Navy
“Worst-case scenarios about sea-ice loss are
coming true: the Arctic Ocean could be ice-free in
summertime as soon as 2010”
Louis Fortier, Université Laval
14.
15. No matter where we
stand at the end of the
melt season, it’s just
reinforcing this notion
that the Arctic ice is in
its death spiral.
Mark Serreze, NSIDC
31. Existing coupled
climate models lack a
robust treatment of soil
carbon dynamics.
32.
33.
34. The [IPCC] range does not include
… contributions from rapid
dynamic processes in the
Greenland and West Antarctic ice
sheets which… could eventually
raise sea level by many meters.
Lacking such processes…
projections based on such models
may seriously understate
potential future increases.
Oppenheimer et al.
35. “Because understanding of some
important effects driving sea-level
rise is too limited, this report
does not assess the likelihood, nor
provide a best estimate or an
upper bound for sea-level rise…
therefore the upper values of the
ranges are not to be considered
upper bounds for sea-level rise.”
IPCC, Synthesis (2007)
