Scientific Value of Arctic Sea Ice Imagery Derived Products (2009) / Chapter Skim
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1 Sea Ice and the Global Climate System
1 Sea Ice and the Global Climate System
Pages 5-10
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From page 5... ...
The amplitude of this cycle is small for thick, multiyear ice and much larger for seasonal ice. If the Arctic sea ice cycle were to evolve toward an ice-free summer, the increased amplitude of the upper ocean salinity variations may have profound consequences for the entire thermohaline regime of the Nordic Seas, including the properties and rate of production of North Atlantic Deep Water and the global thermohaline circulation (Wadhams, 2005)
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From page 6... ...
While the Intergovernmental Panel on Climate Change (IPCC) models provide meaningful projections of future global temperature and precipitation, projections of Arctic sea ice cover range widely, from almost no change to the end of the 21st century, to a disappearance of the ice cover at the end of summer 20 years from now.
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From page 7... ...
The black line shows the mean monthly cloud amount observed at the Russian drifting stations in the Arctic Basin (Lindsay, 1998)
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From page 8... ...
Because cloud amount decreases downwelling shortwave but increases downwelling longwave radiation, the relative impact of clouds on the total downwelling radiation that is observed by the ice may be greater in winter than summer. The extremely high intermodel variance of cloudiness, particularly during the winter months (Figure 1.2, top panel)
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From page 9... ...
The stronger decline in the summer sea ice extent compared to the winter extent indicates that an increasing amount of multiyear ice either melts or is exported through Fram Strait, which is compensated to some extent by an increase in first-year (and thus thinner) sea ice (Figure 1.4)
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From page 10... ...
10 Scientific Value of Arctic Sea Ice Imagery Derived Products FIGURE 1.5 Decline in Arctic Ocean Multiyear Sea Ice Coverage. SOURCE: Figure courtesy of Ron Kwok, JPL.
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