Arctic Report Card 2018: Effects of persistent Arctic warming continue to mount Surface Air Temperature Terrestrial Snow Cover Greenland Ice Sheet Sea Ice Sea Surface Temperature Arctic Ocean Primary Productivity : The Response of Marine Algae to Climate Warming and Sea Ice Decline Tundra Greenness River Discharge Lake Ice Migratory Tundra Caribou and Wild Reindeer Clarity and Clouds: Progress in Understanding Arctic Influences on Mid-latitude Weather Harmful Algae Blooms in the Arctic Microplastics in the Marine Realms of the Arctic with Special Emphasis on Sea Ice Landfast Sea Ice in Changing Arctic

In its 13th year, NOAA's Arctic Report Card (www.arctic.noaa.gov/Report-Card/) reflects on a range of land, ice, and ocean observations made throughout the Arctic during the 2018 calendar year. A series of 14 essays written by more than 80 scientists from 12 countries are included in the 2018 Arctic Report Card. As in previous years, this update highlights the changes that continue to occur in, and among, the physical and biological components of the Arctic environmental system.