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Japan's new seafloor record could sharpen megathrust earthquake warnings in Nankai Trough

Off the southern coast of Japan, the Philippine Sea Plate lies underneath the Japanese mainland. The locked tectonic plates threaten to unleash a catastrophic megathrust earthquake, likely within the next few decades. Given the potential devastation a large quake could evoke, constant developments in predictive technology must be sought. However, predicting the unpredictable movement of the seafloor requires innovative thought.

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Attribution constraints reveal stronger future intensification of the upper‑level Hadley circulation

The Hadley circulation, a key atmospheric conveyor belt transporting heat and moisture from the tropics to the subtropics, directly influences subtropical aridity, the positions of tropical rainfall belts, and extreme weather risks. However, climate models have long shown inconsistencies in simulating its upper-level intensity (UP-HCI), undermining the reliability of future projections.

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Arctic river deltas face rising climate pressure while holding vast frozen carbon reserves

Many rivers flow into the Arctic Ocean north of the Arctic Circle—including the Lena in Siberia and the Mackenzie River in Canada. The deltas of these large and small rivers store large amounts of carbon, which is bound there in frozen soils and sediments. Climate change, however, is destabilizing the deltas from the ocean and land side and also from the air.

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Deep-Earth seismic anomalies may be explained by newly discovered manganese compound

Scientists know that manganese, in its various oxide forms, plays a significant role in Earth's geochemical cycles. However, the exact forms of manganese, their abundance and the mechanisms behind these cycles that occur in Earth's deep, high-pressure interior are not well understood. But, a recent study, published in Physical Review B, reports on a newly discovered manganese rich compound that might help shed light on manganese's behavior in Earth's interior and explain why seismic waves slow down in certain regions.

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Rising seas could eventually 'drown' mangroves and release carbon

Mangroves could store less carbon—and even begin releasing it—as sea levels rise, suggests new research in Earth's Future. Mangroves are made up of salt-tolerant plants that grow in coastal areas. They cover less than 1% of Earth's surface but store about 15% of all ocean carbon, most of it in their soils. This ability to store carbon makes them important in efforts to limit climate change. Previous research has suggested rising seas could increase carbon storage in mangroves, but the new study challenges this.

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Atmospheric rivers over Japan intensify 8% in 42 years, raising flood risk

Atmospheric rivers (ARs) are long, narrow bands of intense water vapor transport that move large amounts of moisture from low to midlatitudes, resembling giant rivers in the sky. They are gaining widespread attention because of their potential to trigger flooding across the Japanese archipelago. Researchers at the University of Tsukuba have discovered that, influenced by global warming and the strengthening of the North Pacific Subtropical High, the intensity of water vapor transport in ARs has increased by about 8% over the past 42 years, from 1981 to 2022. The findings are published in the journal Climate Dynamics.

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Antarctic 'sky rivers' deliver up to 90% of snowfall, 3D algorithm suggests

Atmospheric rivers act like "rivers in the sky," shuttling intense bands of warm, heavy moisture from lower to higher latitudes. When an atmospheric river encounters cold air or mountainous terrain, the moisture it carries condenses and falls as heavy rain or snow. In Antarctica, the arrival of an atmospheric river can help build surface ice mass. Much of Antarctica is very dry; an atmospheric river can bring the moisture needed to potentially offset some ice loss.

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Amazon rainforest emits new stress-defense molecules during El Niño drought

The Amazon rainforest responded to the most severe drought ever recorded in the basin with an unexpected defense mechanism. Researchers at the Max Planck Institute for Chemistry in Mainz, Germany, found that during and after the intense 2023–2024 El Niño cycle, the most intense drought ever recorded in the region, vegetation significantly changed its chemical emissions to cope with environmental stress. The study was published in Communications Earth & Environment.

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Plate tectonics shaped the Cradle of Civilization by merging two ancient rivers, study suggests

The Euphrates River is the longest river in Western Asia and runs through the eastern side of the Fertile Crescent. Flowing over 1,700 miles from Turkey through Syria and Iraq, the river played a crucial role in sustaining the region known as the "Cradle of Civilization." Yet, researchers aren't sure about the river's origins or how tectonic activity might have shaped its evolution. A new study, published in Nature Geoscience, suggests that two ancient rivers, diverted by shifting plate tectonics, merged to form this vital river.

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Atacama Desert's extreme aridity initiated 20 million years earlier than previously thought, study finds

A collaborative study with the University of Cologne, recently published in Nature Communications, provides compelling evidence that the extreme aridity in the hyperarid core of the Atacama Desert began over 40 million years ago—significantly earlier than previously assumed. The findings require a reconsideration of how deserts form and offer a new perspective on the long-term evolution of Earth's most extreme environments. Researchers from SUERC Centre for the Isotope Sciences are co-authors of a study which casts new light on the history of Earth's driest region, the Atacama Desert in Chile.

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