Tag

Sea Level

All articles tagged with #sea level

science1 month ago•56 min saved

Antarctica’s Subtle Gravity Dip Unveils a 70-Million-Year Deep-Earth Tale

A new study using seismic data and mantle-flow modeling shows Antarctica hides a large, persistent gravity low called the Antarctic Geoid Low. Reconstructing roughly 70 million years of mantle motion, researchers find this gravity feature is not a transient anomaly but a long-lived imprint of deep-Earth dynamics that intensified around 34 million years ago as Antarctica became permanently ice-covered. While it’s not a literal hole, the gravity dip reveals how mass is distributed deep inside Earth and could subtly influence regional sea levels, underscoring how slow, deep-earth processes reshape the planet’s gravity field over geological time.

via Space|

#antarctic-geoid-low #deep-earth #gravity

science1 month ago•2 min saved

Antarctica's Gravity Hole Deepens as Ice Sheets Expand Over Millions of Years

A new study maps Antarctica’s gravity hole and shows it has strengthened over tens of millions of years, coinciding with major climate shifts and glacier growth. Using global earthquake data to 'scan' the planet’s interior, researchers aim to understand how interior gravitational changes might influence ice-sheet dynamics and sea levels, though a direct causal link isn’t yet proven.

via Futurism|

#antarctica #climate-change #glaciers

earth-science1 month ago•15 min saved

Antarctica’s Gravity Hole Grows Stronger, Hinting at Deep Mantle Shifts

Scientists used earthquakes and geophysical data to reconstruct Earth’s interior and map a gravity hole beneath Antarctica that began weakening but has grown stronger over roughly 50–30 million years, driven by competing mantle flows (cold, sinking material beneath and hotter, rising material above). This amplified mass deficit alters the geoid and regional sea-level dynamics, offering clues about ice-sheet stability and climate-related sea-level changes, though the exact future impact remains uncertain.

via Gizmodo|

#antarctica #earth-science #geophysics

science6 months ago•2 min saved

Major Ocean Currents Face Critical Shifts Threatening Global Ecosystems

Research indicates that the Antarctic Circumpolar Current (ACC), the world's largest ocean current, may shift its location and change its strength over the coming centuries due to natural cycles and climate change, potentially impacting global climate, sea levels, and ecosystems.

via IFLScience|

#antarctic-circumpolar-current #climate-change #ecosystems

science9 months ago•2 min saved

Dams' Massive Water Storage Is Shifting Earth's Poles

Human construction of nearly 7,000 dams over the past 200 years has caused the Earth's poles to shift by about three feet due to mass redistribution, affecting the planet's rotation and sea levels, highlighting the need to consider dam water storage in future sea level rise predictions.

via Gizmodo|

#dams #earths-poles #mass-redistribution

science9 months ago•3 min saved

Dams and Water Projects May Alter Earth's Rotation, NASA Warns

New research shows that the construction of thousands of dams worldwide has caused Earth's poles to shift by redistributing mass, with a total movement of about 3.7 feet over nearly two centuries, and also impacts sea levels by trapping water behind dams, which should be considered in sea level rise projections.

via Live Science|

#dams #earths-poles #polar-wander

science1 year ago•2 min saved

Unraveling the Mystery of the Mediterranean's Ancient Vanishing Act

Recent studies have uncovered that the Messinian Salinity Crisis, occurring between 5.97 and 5.33 million years ago, transformed the Mediterranean Sea into a massive salt basin through a two-phase evaporation process. This led to a dramatic drop in sea levels, losing up to 70% of its water volume, and caused significant environmental impacts, including volcanic eruptions and global climate changes. The findings, published in Nature Communications, enhance understanding of past geological phenomena and their global repercussions.

via SciTechDaily|

#climate-change #geology #mediterranean

earth-science2 years ago•3 min saved

Unearthing Antarctica's Ancient Expansion through Mississippi Mud

Mud cores drilled in Mississippi have provided clues about the formation of major ice sheets on Antarctica and a significant climate cooling event. The cores revealed that falling sea levels led to a release of carbon from coastal environments into the atmosphere, contributing to a temporary brake on climate cooling. The study fills in gaps in the geological record and sheds light on the timeline of the Eocene-Oligocene transition, highlighting the role of the biosphere and carbon cycle in Earth's climate shifts.

via Phys.org|

#antarctica #carbon-cycle #climate-change

science-and-technology3 years ago•2 min saved

New Satellite Study Unveils Map of Lunar Water Near Moon's South Pole

The Surface Water and Ocean Topography (SWOT) mission, led by NASA and CNES, has provided the first detailed images of ocean currents like the Gulf Stream, using its Ka-band Radar Interferometer (KaRIn) instrument. The satellite will measure the elevation of nearly all the water on Earth’s surface and provide one of the most comprehensive surveys yet of our planet’s surface water. SWOT’s measurements of freshwater bodies and the ocean will provide insights into how the ocean influences climate change and the water cycle, how a warming world affects water storage in lakes, rivers, and reservoirs, and how communities can better manage their water resources and prepare for floods and other disasters.

via nasa.gov|

#climate-change #ocean-currents #science-and-technology