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October 2019

Recent Warming in the Bering Sea and Its Impact on the Ecosystem

The Bering Sea is the third largest semi-enclosed sea in the world and forms the transition between the subarctic North Pacific Ocean and the Arctic Ocean. This article focuses on the eastern shelf, which has an exceptionally productive ecosystem, supporting large numbers of seabirds and marine mammals, subsistence harvests for native communities across Alaska, and more than 40% of the annual U.S. catch of fish and shellfish.

Recent Warming in the Bering Sea and Its Impact on the Ecosystem Read More »

Permafrost and the Global Carbon Cycle

The Arctic continues to warm at a rate that is currently twice as fast as the global average. Warming is causing perennially-frozen ground (permafrost) to thaw, with permafrost in many locations currently reaching record high temperatures. Organic carbon contained in soils of the permafrost region represent a climate-sensitive carbon reservoir that is affected by warming air and ground temperatures and permafrost thaw. 

Permafrost and the Global Carbon Cycle Read More »

Voices from the Front Lines of a Changing Bering Sea

The Bering Sea is home to over 70 Indigenous communities of the Iñupiat, Central Yup’ik, Cup’ik, St. Lawrence Island Yupik, Unangan, and Chukchi Peoples. We are peoples of the world’s richest sea. We study the ocean and weather as a way of life, as a means for survival. The Bering Sea is undergoing changes that have never been observed in our lifetimes, but were foreseen by our elders decades ago.

Voices from the Front Lines of a Changing Bering Sea Read More »

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, persistence, and Arctic-wide patterns of recent temperature increases are indicators of global climate change from increasing concentrations of atmospheric greenhouse gases. Warming atmospheric temperatures also act as a driver of Arctic changes in the ocean and on land. 

Surface Air Temperature Read More »

Fig. 1. (a) SSMIS-derived surface melt area as a percentage of the ice sheet area during 2019 (solid red) and 2012 (solid purple)

Greenland Ice Sheet

The Greenland ice sheet sits atop the largest island in the world and, as the second largest ice sheet on the Earth, contains the equivalent of roughly 7.4 m of global mean sea level rise. While the ice sheet was likely in balance (i.e., ice mass gain was balancing ice mass loss) during the 1970s, 1980s, and early 1990s, it began to lose mass in earnest beginning in the mid- to late-1990s. 

Greenland Ice Sheet Read More »

Sea Ice

Sea ice is an important element of the Arctic system because it (1) acts as a barrier between the underlying ocean and the atmosphere, (2) limits the amount of absorbed solar energy during the summer due to its high albedo, (3) provides a habitat for biological activity, (4) limits human access to the Arctic Ocean, and (5) serves as a platform for Indigenous community hunting and travel.

Sea Ice Read More »

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

Autotrophic single-celled algae living in 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 »

Tundra Greenness

Arctic lands and seas have experienced dramatic environmental and climatic changes in recent decades. These changes have been reflected in progressive increases in the aboveground quantity of live vegetation across most of the Arctic tundra biome-the treeless environment encircling most of the Arctic Ocean. This trend of increasing biomass is often referred to as “the greening of the Arctic.”

Tundra Greenness Read More »

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