Signs of Thaw in the Bering Sea

NASA Science
Two large, partly snow-covered islands lie west of mainland Alaska. Sea ice fragments form swirling patterns in the ocean, and brown water lines part of the Alaskan coastline.

natural color
false color

Two large, partly snow-covered islands lie west of mainland Alaska. Sea ice fragments form swirling patterns in the ocean, and brown water lines part of the Alaskan coastline.NASA Earth Observatory/Michala Garrison
A false-color satellite image shows two large islands west of mainland Alaska. Sea ice fragments appear light blue and form swirling patterns in the ocean. The land appears mostly light green, interrupted by many small ponds and a large river delta.NASA Earth Observatory/Michala Garrison
Two large, partly snow-covered islands lie west of mainland Alaska. Sea ice fragments form swirling patterns in the ocean, and brown water lines part of the Alaskan coastline.NASA Earth Observatory/Michala Garrison
A false-color satellite image shows two large islands west of mainland Alaska. Sea ice fragments appear light blue and form swirling patterns in the ocean. The land appears mostly light green, interrupted by many small ponds and a large river delta.NASA Earth Observatory/Michala Garrison
natural color
false color
Sea ice fragments drift near Alaska’s Saint Lawrence and Nunivak islands and colorful water surrounds the Yukon Delta in natural-color (left) and false-color (right) images acquired with the MODIS (Moderate Resolution Imaging Spectroradiometer) on NASA’s Terra satellite on June 3, 2026. NASA Earth Observatory images by Michala Garrison.

When clouds parted in early June 2026, satellites glimpsed hints of summer’s approach in the Bering Sea off Alaska’s coast. Sea ice, broken into small fragments, took a few final spins on its way to melting completely, while rivers swollen with snowmelt washed sediment and organic material out to sea.

These images, acquired with the MODIS (Moderate Resolution Imaging Spectroradiometer) on NASA’s Terra satellite on June 3, 2026, capture the seasonal transition. A false-color view of the area (right) brings out features of the landscape that are more subtle in the natural-color scene (left), as human eyes would see it. In false color, the tundra and marsh vegetation appear green, and ice-free rivers and thermokarst lakes are dark blue. Sea ice and snow, where they still linger, appear light blue.

Amid the seasonal phenomena playing out in the images stand Saint Lawrence and Nunivak islands. Both have volcanic origins and are among the largest islands in the United States. They contain extensive basaltic lava flows forming small shield volcanoes, along with other features such as cinder cones and maars, or low-lying volcanic craters.

Saint Lawrence Island lies about 150 miles (240 kilometers) directly south of the Bering Strait, separating Alaska and the Russian Far East. It is one of the few pieces of the land bridge that connected Asia and North America during the Pleistocene that remain above water. Pack ice persisted along the northeast side of the island in early June, while other sea ice drifted and curled into intricate patterns with the winds and currents. The smaller the ice fragments, the wispier their swirling patterns appear when observed by satellites.

Brownish water, likely containing a mixture of suspended sediment and colored dissolved organic matter, lines the coast of mainland Alaska. The colorful water appears to enter the sea around the Yukon Delta, a vast wetland where the Yukon River branches into many circuitous channels. Sediment concentrations in this area typically increase starting in late May or early June. That’s after river ice has broken up and runoff from rain and snowmelt carries eroded material downstream.

NASA Earth Observatory images by Michala Garrison, using MODIS data from NASA EOSDIS LANCE and GIBS/Worldview. Story by Lindsey Doermann.

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June 3, 2026: Natural color

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June 3, 2026: False color

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