IPCC Fourth Assessment Report: Climate Change 2007
Climate Change 2007: Working Group I: The Physical Science Basis
Figure 4.9

Figure 4.9. Summer minimum arctic sea ice extent from 1979 to 2005. Symbols indicate annual mean values while the smooth blue curve shows decadal variations (see Appendix 3.A). The dashed line indicates the linear trend, which is –60 ± 20 × 103 km2 yr–1, or approximately –7.4% per decade (updated from Comiso, 2002).