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Report Card 2018

About Arctic Report Card 2018

The Arctic Report Card (hereafter ‘ARC’) has been issued annually since 2006. It is a timely and peer-reviewed source for clear, reliable and concise environmental information on the current state of different components of the Arctic environmental system relative to historical records. The ARC is intended for a wide audience, including scientists, teachers, students, decision-makers, and the general public interested in the Arctic environment and science.

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Surface Air Temperature

Arctic surface air temperature is an indicator of both regional and global climate change. Although there are year-to-year and regional differences in air temperatures driven by natural variability, the magnitude, year-to-year persistence, and Arctic-wide character of recent temperature increases is a major indicator of global climate change and the concentration of atmospheric greenhouse gases.

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Fig. 1. a) SSMIS-derived surface melt area as a percentage of the ice sheet area during 2018 52 (solid red)

Greenland Ice Sheet

The Greenland ice sheet plays a crucial role on our planet and in the Arctic. The high albedo of the ice sheet contributes to modulating the amount of solar energy absorbed by the Earth and controls atmospheric circulation because of its location and topography. Moreover, Greenland represents a major contributor to current and projected sea level rise, through surface runoff and calving.

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Sea Ice

Arctic sea ice cover varies substantially over the year, with end-of-winter ice cover generally being two to three times as large as at the end of summer. Sea ice is an important element of the Arctic system: (1) acting as a barrier between the underlying ocean and the atmosphere, (2) limiting the amount of absorbed solar energy during the summer due to its high albedo, (3) providing a habitat for biological activity, and (4) limiting human access to the Arctic Ocean.

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Sea Surface Temperature

Summer sea surface temperatures (SST) in the Arctic Ocean are driven mainly by the amount of incoming solar radiation absorbed by the sea surface. Solar warming of the Arctic surface ocean is influenced by the distribution of sea ice (with greater warming occurring in ice-free regions), cloud cover, water color, and upper-ocean stratification. As the area of sea ice cover decreases, more incoming solar radiation is absorbed by the ocean and the warmer ocean, in turn, melts more sea ice.

Sea Surface Temperature Read More »

Arctic Ocean Primary Productivity: The Response of Marine Algae to Climate Warming and Sea Ice Decline

Autotrophic single-celled algae living in the sea ice (ice algae) and water column (phytoplankton) are the main primary producers in the Arctic Ocean. Through photosynthesis, they transform dissolved inorganic carbon into organic material. Consequently, primary production provides a key ecosystem service by providing energy to the entire food web in the oceans.

Arctic Ocean Primary Productivity: The Response of Marine Algae to Climate Warming and Sea Ice Decline Read More »

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