Tag

Earth Science

All articles tagged with #earth science

earth-science16 days ago•13 min saved

The 0.6 Rule: Rivers Shape Fractal Waterways and Deltas

Hack's law: stream length scales roughly as drainage area to the 0.6 power, and it holds worldwide, now extending to river deltas. Through energy-efficient transport networks and landscape-evolution modeling, scientists explain why larger basins elongate rivers, how networks optimize drainage, and why this simple scaling persists even as sediments accumulate at deltas. The work links river bifurcation angles to fivefold symmetry and hints at connections to quasicrystals, revealing a universal geometry of Earth's waterways.

via Quanta Magazine|

#deltas #earth-science #fractals

science19 days ago•5 min saved

Mysterious Core Reversal: Eastward Flow Detected Beneath the Pacific

Researchers using ESA Swarm and CryoSat data have traced a dramatic shift in a broad region of molten iron beneath the equatorial Pacific from westward to eastward flow around 2010, challenging the view of a stable outer-core circulation and potentially linking to inner-core changes; the eastward flow has weakened since 2020, and scientists will monitor to determine if this is a temporary fluctuation, part of a cycle, or a new long-term state, with implications for Earth's magnetic field generation (the geodynamo).

via ScienceDaily|

#earth-science #geomagnetism #geophysics

earth-science20 days ago•6 min saved

Desert Dunes Meet Freshwater Lagoons in Lençóis Maranhenses

NASA’s Earth Observatory highlights Lençóis Maranhenses National Park in Brazil as a vast dune field that fills with seasonal freshwater lagoons; dunes migrate westward under strong northeast winds, lagoons peak during the wet season and dry by December, and UNESCO designated the site a World Heritage venue in 2024 for its unique geology and biodiversity.

via NASA Science (.gov)|

#brazil #dunes #earth-science

earth-science22 days ago•5 min saved

Bare Ice Arrives Early on Barnes Ice Cap, 2026 Melt Quickens

Landsat 9 imagery shows Barnes Ice Cap on Baffin Island losing its snow cover unusually early in the 2026 Arctic summer, exposing bare ice dotted with blue meltwater ponds and a widening network of meltwater channels. With snow gone, the ice warms and melts faster, indicating continued thinning and retreat (historically about 4 m per year over 40 years, with some areas retreating much faster) and earlier surface runoff that reduces refreezing.

via NASA Science (.gov)|

#barnes-ice-cap #climate-change #earth-science

earth-science23 days ago•16 min saved

Blood Falls Reveals Ancient Marine Origins Hidden Beneath Taylor Glacier

A Nature Geoscience study shows Blood Falls' vivid red water originates from ancient seawater released from beneath Taylor Glacier, with genetic analysis indicating the brine hosts predominantly marine-associated microbes. The findings support the idea of a relic marine ecosystem beneath the Dry Valleys and suggest the subglacial water was trapped during past warm periods, offering a new timeline for flooding and isolation events and illustrating life's resilience in extreme polar environments.

via Gizmodo|

#ancient-ocean #antarctica #biology

earth-science1 month ago•17 min saved

Ancient Ferns Fueled the End-Triassic Firestorm

Volcanic activity helped trigger the end-Triassic mass extinction, but a giant fern spike produced dry, combustible mats that fueled massive wildfires, leaving charcoal- and PAH-rich layers in sediment cores. Ferns, resilient underground, may have amplified the crisis for tens of thousands to hundreds of thousands of years, illustrating how interconnected Earth systems can worsen disasters.

via Gizmodo|

#earth-science #end-triassic-extinction #fern-spike

earth-science1 month ago•17 min saved

Oceans Run Low on Oxygen, Threatening Earth's Balance

A new review warns that warming oceans and nutrient runoff are depleting dissolved oxygen in water bodies, with global ocean oxygen down ~2% since the 1950s and potentially falling another 1–7% by 2100, a trend that could disrupt aquatic ecosystems and destabilize the biosphere; the study argues aquatic deoxygenation should be added to the Planetary Boundaries framework, proposing indicators like dissolved oxygen concentration, proximity to capacity, shifts in oxygen‑sensitive species, and the Metabolic Index to track risk.

via Gizmodo|

#climate-change #dissolved-oxygen #earth-science

earth-science1 month ago•16 min saved

Real Gold Lurks Inside Fool’s Gold at Deep-Sea Vents

Japanese scientists aboard the Shinsei Maru found real gold embedded in pyrite near Higashi‑Aogashima Knoll’s hydrothermal vents, with concentrations up to 1.9% by weight—far higher than other deep‑sea deposits—trapped in colloform pyrite formed by vent fluids and arsenic-rich minerals; detected using secondary ion mass spectrometry (SIMS). This “invisible gold” could guide future deep‑sea exploration and mining.

via Gizmodo|

#deep-sea-mining #earth-science #hydrothermal-vents

earth-science1 month ago•16 min saved

Ancient Ocean Heatwaves Hint at Today’s Warming Danger

A new study links the Permian-Triassic 'Great Dying' to warming oceans with expanding oxygen-poor waters, showing species most vulnerable to higher temperatures and low oxygen died off at higher rates; the findings serve as a warning that contemporary human-driven warming could trigger a similar marine crisis if carbon emissions aren’t curbed.

via Gizmodo|

#earth-science #global-warming #great-dying

earth-science1 month ago•16 min saved

Timekeepers Eye Leap Hour as Fix for Faster Earth, Replacing Leap Seconds

As Earth's rotation speeds up and the risk of a negative leap second grows, international timekeepers are weighing replacing leap seconds with a leap hour. A CGPM vote in October could formalize the change by 2035, aiming to reduce disruptions to GPS, banking, and other systems after past leap-second headaches like outages tied to UTC adjustments.

via Gizmodo|

#cgpm #earth-science #leap-hour

earth-science1 month ago•17 min saved

Atlantic Conveyor at Risk: New Analysis Suggests AMOC Collapse Could Be Locked In by 2100

A climate-model study, using Greenland ice melt scenarios, suggests the Atlantic Meridional Overturning Circulation (AMOC) may already be locked in toward collapse, with a 10% chance under peak 2025 emissions, rising to 23% in harsher melt scenarios—and potentially 100% by 2100 in the worst case. A collapse would trigger dramatic regional impacts, including sea-level rise along the U.S. East Coast, cooler temperatures for parts of Europe, and more extreme weather. The work is a preprint and debated, but it underscores the urgency of rapid emissions reductions to avert severe climate outcomes.

via Gizmodo|

#amoc #atlantic-ocean #climate-change

earth-science1 month ago•17 min saved

Sky-based tweak could blunt El Niño before it begins

A Science Advances modeling study shows that targeted marine cloud brightening over the southeast tropical Pacific could weaken, or even neutralize, developing El Niño events. In simulations of the 1997–1998 and 2015–2016 super El Niños, applying the technique from June through February restored ENSO-neutral conditions, but researchers stress this is a proof-of-concept and not a-ready-for-field approach, noting uncertainties such as potentially faster La Niña onset and other unintended climate effects that require extensive follow-up before any real-world tests.

via Gizmodo|

#climate-science #earth-science #el-nino

earth-science1 month ago•10 min saved

Pacific Core-Flow Reversal Signals a More Dynamic Geodynamo

A broad region of liquid iron beneath the equatorial Pacific flipped from westward to eastward flow around 2010, revealing the outer core can change circulation more abruptly than previously thought. Using nearly 30 years of data from ground observatories plus ESA Swarm, CryoSat, CHAMP and Ørsted satellites, researchers traced how this flow reversal reshapes our view of the geodynamo and Earth's magnetic field. The finding raises questions about core–mantle–inner-core interactions and whether such reversals are temporary fluctuations or part of a longer cycle, underscoring the need for ongoing monitoring.

via SciTechDaily|

#earth-science #geodynamo #magnetic-field

earth-science2 months ago•4 min saved

Coccolithophore Blooms Paint the Black Sea Turquoise

NASA’s Earth Observatory reports that spring–summer 2026 blooms of coccolithophores tint the Black Sea and the Bosphorus turquoise, a color captured by NASA’s PACE satellite; when diatoms dominate, waters can darken. These blooms are visible from space and contribute to the ocean carbon cycle, as dying coccolithophores transport carbon to the seafloor, with remote sensing aiding bloom-dynamics studies where direct sampling is limited.

via NASA Science (.gov)|

#black-sea #coccolithophores #earth-science

science2 months ago•110 min saved

Earth’s oldest crater re-dated to ~3.0 billion years ago

A new study dates minerals from the North Pole Dome crater in Western Australia to about 3.0 billion years ago, down from the earlier 3.47 billion-year estimate. While still the oldest known impact crater on Earth, it is roughly 800 million years older than the next-oldest confirmed crater, Yarrabubba. The researchers used zircon and other minerals in shatter cones and a shocked quartz vein, noting that later tectonic and thermal activity could produce younger features, which helps explain why previous dating may have overestimated the age.

via Live Science|

#earth-science #geology #impact-crater