activity : nca4-copy_of_indicators-nca3-image_dzto2-process



This figure is updated from the figure titled, "March and September Monthly Average Arctic Sea Ice Extent, 1979–2016" in EPA 2016 by updating the dataset through 2017, removing the March sea ice extent time series, and retitling the figure.

Methodology Citation: EPA, 2016: Climate Change Indicators in the United States, 2016. 4th edition. EPA 430-R16-004. U.S. Environmental Protection Agency, Washington, DC, 96 pp.

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