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In the summer months, sea ice from the Arctic drifts through Fram Strait into the Atlantic. Thanks to meltwater, a stable layer forms around the drifting ice atop the salty seawater, producing significant effects on biological processes and marine organisms.

In recent years, polar bears in the Beaufort Sea have had to travel far outside of their traditional arctic hunting grounds which has contributed to an almost 30% decrease in their population. The bears' home range, or the amount of space they need for food and other resources, was around 64% larger from 1999-2016 than it was in 1986-1998, according to a recent study.

The tiny, pale surf clam about the size of a fingernail that most people have seen and collected on beaches around the world holds clues in its shell to Earth's past. For the first time, researchers have been able to identify the monthly, and even weekly, ocean temperatures recorded in these smooth clam shells. Because ancient civilizations consumed these ubiquitous clams and left the shells at archeological sites, researchers now have a new way to reconstruct climate and its fluctuations from nearly 3,000 years ago.

A new study has found that the minerology of the rocks that a meteorite hits, rather than the size of the impact, determines how deadly an impact it will have.

Interesting floodplain dynamics were observed during and after seasonal flooding in northern Japan. The combination of the natural flow patterns of rivers and the complex geomorphology of the floodplain supported diverse aquatic biota there. Intensive fieldwork and a 2019 flood-recession survey yielded data in flow dynamics, water chemistry, and animal responses in the floodplain.The team's findings reveal that seasonal changes cause extensive floods as well as the expansion and contraction of river channels. The observed spatial and temporal changes to aquatic habitats give rise to distinct responses and adaptations by a diverse range of animals.

Across the U.S. road crews dump around 25 million metric tons of sodium chloride -- much like table salt -- to unfreeze roads each year and make them safe for travel.

While climate change is the primary driver of permafrost degradation in Arctic Alaska, a new analysis of 70 years of data reveals that tundra fires are accelerating that decline, contributing disproportionately to a phenomenon known as 'thermokarst,' the abrupt collapse of ice-rich permafrost as a result of thawing.

The movement of water masses in the ocean, its circulation, is an essential component of the global climate system. Researchers have now been able to show that circulation in the deep ocean was significantly slowed down during the last glacial period. Analyses of sediment samples show that the decomposition of organic carbon in the water masses of the deep sea consumed the oxygen available there.

Retreating glaciers in the Pacific mountains of western North America could produce around 6,150 kilometers of new Pacific salmon habitat by the year 2100, according to a new study.

A new paper by archaeologists at the University of California, Davis, highlights that our extinct cousins, the Denisovans, reached the "roof of the world" about 160,000 years ago -- 120,000 years earlier than previous estimates for our species -- and even contributed to our adaptation to high altitude.

The climate crisis is limiting the availability of krill -- small crustaceans that are vital in the marine food chain -- during summer in some areas of the Antarctica. This involves a decrease in the food abundance for female Antarctic fur seals in summer and a decrease in their reproductive success. Moreover, the predation of pups by the leopard seal has also increased due to a lower abundance of penguins, the main prey of this voracious Antarctic predator. However, the impact of the climate crisis on the Antarctic fur seal in winter has been ignored to date, when the cold, wind and ice make it harder to study the Antarctic ecosystems.

Scientists have discovered that two intense spells of volcanic activity triggered a period of global cooling and falling oxygen levels in the oceans, which caused one of the most severe mass extinctions in Earth history - the 'Late Ordovician Mass Extinction', 450 million years ago.

Coccolithophores are microscopic algae that form tiny limestone plates, called coccoliths, around their single cells. They are responsible for half of the limestone produced in the oceans and therefore play a major role in the carbon cycle and in determining ocean chemistry. A team of scientists show that certain variations in Earth's orbit have influenced the evolution of coccolithophores.

The Arctic Ocean has been getting warmer since the beginning of the 20th century -- decades earlier than records suggest -- due to warmer water flowing into the delicate polar ecosystem from the Atlantic Ocean.

New research has shed light on a sudden cooling event 34 million years ago, which contributed to formation of the Antarctic ice sheets.

After the natural warming that followed the last Ice Age, there were repeated periods when masses of icebergs broke off from Antarctica into the Southern Ocean. A new data-model study now shows that it took only a decade to initiate this tipping point in the climate system, and that ice mass loss then continued for many centuries.

Researchers have now reconstructed how the Indian summer monsoon responded to meltwater pulses into the North Atlantic at the end of the penultimate cold period.

Climate scientists identify abrupt transitions in climate records that may have been caused by the climate system crossing a tipping point. They devised a statistical method to determine whether these transitions are simply noise or evidence of a more significant change. Their method is less error-prone than previous methods, since it doesn't rely on human determination. It also allows comparing different records consistently and can identify important events that may have been overlooked in older studies.

Volcanic eruptions may have triggered abrupt climate changes contributing to the repeated collapse of Chinese dynasties over the past 2,000 years, according to new research. The study also illustrates how volcanic eruptions can profoundly impact vulnerable or unstable regions and highlights the need to prepare for future eruptions.

Volcanic eruptions contributed to the collapse of dynasties in China in the last 2,000 years by temporarily cooling the climate and affecting agriculture, according to a new study. Large eruptions create a cloud that blocks some sunlight for a year or two. That reduces warming of the land in Asia in the summer and leads to a weaker monsoon and less rainfall, reducing crop harvests.