Phys.org: Earth science

Bivalves, such as clams, oysters and mussels, record seasonal environmental changes in their shells, making them living chronicles of climate history. A new study of bivalve shells has detected two major episodes of instability in the North Atlantic Ocean's circulation systems, suggesting that the region may be heading toward a tipping point that could trigger sudden, dramatic changes in global weather patterns.

The Colorado River, which provides water across the Southwest, has lost about 20% of its flow in the last quarter-century, and its depleted reservoirs continue to decline. But negotiations aimed at addressing the water shortage are at an impasse, and leaders of environmental groups say the secrecy surrounding the talks is depriving the public of an opportunity to weigh in.

Sir Ernest Shackleton's ship, Endurance, was crushed by Antarctic sea ice and sank in November 1915. Emblematic of the heroic age of Antarctic exploration, it is widely considered the strongest polar ship of its time, albeit with a fatal flaw—a weakness in the rudder that caused the ship to sink.

New research shows that marine heat waves can reshape ocean food webs, which in turn can slow the transport of carbon to the deep sea and hamper the ocean's ability to buffer against climate change.

For people living near volcanoes, danger goes well beyond lava flows and clouds of ash. Some explosive eruptions can lead to dramatic collapses of the sides of a volcano, like those at Mount St. Helens, Washington, and Anak Krakatau, Indonesia. The latter triggered tsunamis blamed for most deaths from its historic eruptions in 1883.

Sea level rise could put more than 100 million buildings across the Global South at risk of regular flooding if fossil fuel emissions are not curbed quickly, according to a new McGill-led study published in npj Urban Sustainability.

Rivers in northern Sweden do not always become wider or richer in species further downstream. Natural barriers shape the flow and stop plants from spreading, new research from Umeå University shows. The study is published in the journal Communications Earth & Environment.

The planet's warming climate is having effects in Antarctica that increasingly resemble those observed in the Arctic, meaning global sea levels could rise faster than previously predicted, Danish researchers warned on Friday.

When the tectonic subduction zone beneath the Pacific Northwest moves, it does so in dramatic fashion. Not only is ground shaking from a magnitude 9+ earthquake incredibly destructive, the event triggers tsunamis and landslides to compound the damage. Now, a new study in the Geosphere suggests the "really big one" could also trigger a major earthquake in California.

An international research collaboration has harnessed supercomputing power to better understand how massive slabs of ancient ocean floors are shaped as they sink hundreds of kilometers below Earth's surface.

Earth's nastiest and costliest wildfires are blazing four times more often now than they did in the 1980s because of human-caused climate change and people moving closer to wildlands, a new study found.

The ocean holds gigantic amounts of carbon, much more than all land-based plants and soil. Scientists previously studied these carbon stocks in spring and summer. Now, in two published studies, they have looked at what happens in winter.

A team of scientists has uncovered a rare isotope in microscopic fossils, offering fresh evidence that ocean ecosystems may be more resilient than once feared.

An unexpected region of the Amazon is at the forefront of rapid growth in climate extremes, a new report reveals. The central north Amazon, a region with extensive areas of high forest cover, natural savannas and vast Indigenous territories, was not previously considered as being the most affected by climate change.

In a new study, a team of geologists and biologists led by CU Boulder resurrected ancient microbes that had been trapped in ice—in some cases for around 40,000 years.

A first thought when describing a rock formation likely isn't a mille-feuille, but there are actually certain types composed of many thin layers that bring the flaky pastry to mind. Not only that—but these rocks can quite literally fold under pressure. These formations have the interesting ability to fold under compressive forces and form sharply localized bends known as kink bands.

A research group in Japan has suggested that ash released from volcanic eruptions on Nishinoshima Island—part of Japan's Ogasawara Islands—led to a temporary surge in phytoplankton levels in the seawater around Mukojima Island, which is located 130 km northeast of Nishinoshima and is also part of the Ogasawara Islands.

For as long as there have been people in what is now California, the granite peaks of the Sierra Nevada have held masses of ice, according to new research that shows the glaciers have probably existed since the last Ice Age more than 11,000 years ago.

A study published today in Earth System Dynamics provides a critical and previously underestimated connection between Antarctic sea ice, cloud cover, and global warming. This research is important because it shows that a greater extent of Antarctic sea ice today, compared to climate model predictions, means we can expect more significant global warming in the coming decades.

Four of the most important interconnected parts of the Earth's climate system are losing stability, according to a review article based on observational data published in Nature Geoscience. The researchers succeeded in highlighting the warning signals for destabilization of the Greenland Ice Sheet, the Atlantic Meridional Overturning Circulation (AMOC), the Amazon rainforest, and the South American monsoon system.