Figure 21.8

National Oceanic and Atmospheric Administration
Brent M. Lofgren

This figure appears in chapter 21 of the Impacts, Risks, and Adaptation in the United States: The Fourth National Climate Assessment, Volume II report.

The duration of seasonal ice cover decreased in most areas of the Great Lakes between 1973 and 2013, while summer surface water temperature (SWT) increased in most areas between 1994 and 2013. (a) The map shows the rate of change in ice cover duration. The greatest rate of decrease in seasonal ice cover duration is seen near shorelines, with smaller rates occurring in the deeper central parts of Lakes Michigan and Ontario, which rarely have ice cover. (b) The map shows the rate of change in summer SWT. The greatest rates of increase in summer SWT occurred in deeper water, with smaller increases occurring near shorelines. Source: adapted from Mason et al. 2016.9db319af-7cec-440e-8dda-41526fed6cd0 Used with permission from Springer.

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This figure was created on September 22, 2017.

This figure was submitted on November 29, 2018.

References :

• Fine-scale spatial variation in ice cover and surface temperature trends across the surface of the Laurentian Great Lakes (9db319af)

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