Phys.org: Earth science

When and how quickly can ecosystems "tip" and how will they develop in the future? Researchers from the University of Potsdam, the Potsdam Institute for Climate Impact Research, and the Technical University of Munich have developed a new method for measuring how close an ecosystem is to a catastrophic tipping point. They are applying their findings to predict glacier surges, as well as rapid changes in other ecosystems. They have now published their study in Nature Communications.

A UT San Antonio-led international research team has identified chitin, the primary organic component of modern crab shells and insect exoskeletons, in trilobite fossils more than 500 million years old, marking the first confirmed detection of the molecule in this extinct group.

Researchers at Kyoto University have proposed a new physical model that explores how disturbances in the ionosphere may exert electrostatic forces within Earth's crust and potentially contribute to the initiation of large earthquakes under specific conditions. The study does not aim to predict earthquakes but rather presents a theoretical mechanism describing how ionospheric charge variations—caused by intense solar activity such as solar flares—could interact with pre-existing fragile structures in Earth's crust and influence fracture processes.

Earth's surface is covered by more than a dozen tectonic plates, and in subduction zones around the world—including the Japanese Islands—plates converge and dense oceanic plates sink into Earth's interior. These regions, especially plate boundaries, are known for frequent seismic activity.

Southern California's beaches have grown more than 500 acres over the past four decades despite being one of the most heavily urbanized and dammed coastal regions in the world, according to a new study conducted by researchers at the University of California, Irvine, the U.S. Geological Survey and other institutions. The conventional wisdom-challenging revelation about coastal erosion and replenishment is the subject of the study published recently in Nature Communications.

A new study led by Prof. Xiao Wenjiao from the Xinjiang Institute of Ecology and Geography of the Chinese Academy of Sciences sheds light on the ore-forming process and key mechanisms of the gold deposit in the South Tianshan of northwest China. The research was published in the Geological Society of America Bulletin on Jan. 20.

The magnitude 6.9 earthquake that took place in 2018 on the south flank of Kīlauea on the Island of Hawaiʻi may have stalled episodes of periodic slow slip along a major fault underlying the volcano, according to a new study by scientists at the U.S. Geological Survey.

A research team led by Prof. Xiao Kai from the Yantai Institute of Coastal Zone Research of the Chinese Academy of Sciences has systematically elucidated the transformation and transport processes of nutrients in intertidal groundwater. The team employed a combined methodological approach, including multi-depth groundwater sampling, dynamic monitoring, stable isotope tracing, and multivariate statistical analysis. Their findings, published in the Journal of Hydrology, provide scientific evidence to deepen understanding of the terrestrial drivers of nearshore eutrophication.

Stanford researchers have created the first-ever global map of a rare earthquake type that occurs not in Earth's crust but in our planet's mantle, the layer sandwiched between the thin crust and Earth's molten core. The new map will help scientists learn more about the mechanics of mantle earthquakes, in turn opening a window into the complexities and triggers for all earthquakes.

A combination of weakened atmospheric removal and increased emissions from warming wetlands, rivers, lakes, and agricultural land increased atmospheric methane at an unprecedented rate in the early 2020s, an international team of researchers report today in the journal Science.

In the Pacific Northwest, big faults like the Cascadian subduction zone located offshore, get a lot of attention. But big faults aren't the only ones that pose significant hazards, and a new study investigates the dynamics of a complex fault zone that runs right under the heart of Seattle.

Scientists at the University of Southampton have uncovered evidence from ancient rocks that Earth's climate continued to fluctuate during its most extreme ice age—known as Snowball Earth. During the Cryogenian Period, between 720 and 635 million years ago, it has long been believed that Earth's climate entirely shut down.

Every year at Grand Canyon National Park, millions of visitors from all over the world stop at one of a dozen water spigots. Most people are on a rim, seeing the canyon's majesty for the first time, when they step off the trail to refill a water bottle. Others are deep in the belly of the canyon, sweaty and tired, facing a hike up in punishing heat, filling their reservoirs and dumping water over their heads to avoid dehydration and heat stroke.

Global climate models capture many of the processes that shape Earth's weather and climate. Based on physics, chemistry, fluid motion and observed data, hundreds of these models agree that more carbon dioxide in the atmosphere leads to hotter global temperatures and more extreme weather. Still, uncertainty remains around how seasonal weather patterns and atmospheric systems like the jet stream will respond to global warming. Some of this uncertainty stems from the way models approximate the effects of relatively short-lived, small-scale phenomena known as gravity waves.

Seamounts and the oxygen minimum zone (OMZ) are two typical deep-sea habitats that often coexist. However, determining whether the "seamount effect" alters OMZ structure through marine stratification, thereby influencing the deep-sea hypoxic environment and carbon sink processes, remains unconfirmed.

British scientists said Thursday that a world-first AI tool to catalog and track icebergs as they break apart into smaller chunks could fill a "major blind spot" in predicting climate change.

Great things can come from failure when it comes to geology. The Midcontinent rift formed about 1.1 billion years ago and runs smack in the middle of the United States at the Great Lakes. The rift failed to completely rupture, and had it succeeded it would have torn North America apart. Under immense pressure from receding tectonic plates, the weakened lithosphere instead created a basin in the crust eventually filled by Lake Superior, and it also exposed a 3000-km-long band of deeply buried igneous and sedimentary rocks.

Forest soils have an important role in protecting our climate: They remove large quantities of methane—a powerful greenhouse gas—from our atmosphere. Researchers from the University of Göttingen and the Baden-Württemberg Forest Research Institute (FVA) have evaluated the world's most comprehensive data set on methane uptake by forest soils. They discovered that under certain climate conditions, which may become more common in the future, forest soils' capacity to absorb methane actually increases.

The Asian-Australian monsoon system (A-AuMS) is the world's most typical cross-equatorial coupled monsoon system. On a seasonal timescale, the summer monsoon in one hemisphere is usually linked to the winter monsoon in the other via outflows. However, robust evidence is lacking as to whether such cross-equatorial monsoon coupling persists during orbital-scale paleoclimate evolution. A scarcity of high-resolution paleoclimatic records from the Northern Australian monsoon region in the Southern Hemisphere has limited a full understanding of the A-AuMS's dynamic mechanisms.

Parts of ancient Earth may have formed continents and recycled crust through subduction far earlier than previously thought. New research led by scientists at the University of Wisconsin–Madison has uncovered chemical signatures in zircons, the planet's oldest minerals, that are consistent with subduction and extensive continental crust during the Hadean Eon, more than 4 billion years ago.