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Oceanography
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The Lead

Scientists discover elusive secret of how continents formed

March 31, 2015 11:58 am | by John Pastor, Virginia Tech | News | Comments

An international research team, led by a Virginia Tech geoscientist, has revealed information about how continents were generated on Earth more than 2.5 billion years ago, and how those processes have continued within the last 70 million years to profoundly affect the planet's life and climate.

Antarctic ice shelves rapidly thinning

March 27, 2015 10:08 am | by Mario Aguilera, Univ. of California, San Diego | News | Comments

A new study led by Scripps Institution of Oceanography at the Univ. of California, San Diego,...

Massive amounts of fresh water, glacial melt pouring into Gulf of Alaska

March 20, 2015 8:00 am | by David Stauth, Oregon State Univ. | News | Comments

Incessant mountain rain, snow and melting glaciers in a comparatively small region of land that...

Ocean pipes “not cool”, would end up warming climate

March 19, 2015 1:52 pm | by Carnegie Institute | News | Comments

To combat global climate change caused by greenhouse gases, alternative energy sources and other...

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East Antarctica melting could be explained by oceanic gateways

March 16, 2015 3:46 pm | by Monica Kortsha, Univ. of Texas at Austin | News | Comments

Researchers at The Univ. of Texas at Austin have discovered two seafloor gateways that could allow warm ocean water to reach the base of Totten Glacier, East Antarctica’s largest and most rapidly thinning glacier. The discovery probably explains the glacier’s extreme thinning and raises concerns about how it will affect sea level rise.

On thin ice

March 3, 2015 10:41 am | by Hannah Hickey, Univ. of Washington | News | Comments

It’s no surprise that Arctic sea ice is thinning. What is new is just how long, how steadily, and how much it has declined. Univ. of Washington researchers compiled modern and historic measurements to get a full picture of how Arctic sea ice thickness has changed. The results show a thinning in the central Arctic Ocean of 65% between 1975 and 2012.

Sea level spiked for two years along northeastern North America

February 24, 2015 11:32 am | by Mari N. Jensen, Univ. of Arizona | News | Comments

Sea levels from New York to Newfoundland jumped up about four inches in 2009 and 2010 because ocean circulation changed, a Univ. of Arizona-led team reports in Nature Communications. The team was the first to document that the extreme increase in sea level lasted two years, not just a few months.

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Rivers can be a source of antibiotic resistance

February 13, 2015 2:43 pm | by Univ. or Warwick | News | Comments

Rivers and streams could be a major source of antibiotic resistance in the environment. The discovery comes following a study on the Thames river by scientists at the Univ. of Warwick and the Univ. of Exeter. The study found that greater numbers of resistant bacteria exist close to some waste water treatment works, and that these plants are likely to be responsible for at least half of the increase observed.

Carbon release from ocean helped end the ice age

February 13, 2015 9:20 am | by Jim Shelton, Yale Univ. | News | Comments

New techniques are allowing scientists to understand how carbon dioxide, released from the deep ocean, helped to end the last ice age and create our current climate. An international team studied the shells of ancient marine organisms that lived in surface waters of the southern Atlantic and eastern equatorial Pacific oceans thousands of years ago.

Researcher Calculate Plastic Waste in Ocean

February 13, 2015 7:00 am | by UC Santa Barbara | News | Comments

Ocean currents have been carrying floating debris into all five of the world’s major oceanic gyres for decades. However, exactly how much plastic is making its way into the world’s oceans and from where it originates has been a mystery— until now.  

Dead Zones Aid Oyster Disease

February 12, 2015 7:00 am | by Smithsonian | News | Comments

In shallow waters around the world, where nutrient pollution runs high, oxygen levels can plummet to nearly zero at night. Oysters living in these zones are far more likely to pick up the lethal Dermo disease.

Paying rent with sugar and fat

February 11, 2015 12:44 pm | by Jan Overney, EPFL | News | Comments

Coral reefs are the jungles of the oceans, home to some of the planet’s most fertile fishing grounds, and hotspots of global tourism.                     

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Waves in the deep

February 3, 2015 9:03 am | by Jennifer Chu, MIT News Office | News | Comments

Acoustic-gravity waves can be generated by underwater earthquakes, explosions and landslides, as well as by surface waves and meteorites. A single one of these waves can stretch tens or hundreds of kilometers, and travel at depths of hundreds or thousands of meters below the ocean surface, transferring energy from the upper surface to the seafloor, and across the oceans. Acoustic-gravity waves often precede a tsunami or rogue wave.

Extreme oxygen loss in oceans accompanied past global climate change

January 29, 2015 11:58 am | by Kat Kerlin, UC Davis News Service | News | Comments

Seafloor sediment cores reveal abrupt, extensive loss of oxygen in the ocean when ice sheets melted roughly 10,000 to 17,000 years ago, according to a study. The findings provide insight into similar changes observed in the ocean today. In the study, researchers analyzed marine sediment cores from different world regions to document the extent to which low oxygen zones in the ocean have expanded in the past, due to climate change.

Using ocean waves to monitor offshore oil and gas fields

January 29, 2015 7:54 am | by Ker Than, Stanford Univ. | News | Comments

A technology developed by Stanford Univ. scientists for passively probing the seafloor using weak seismic waves generated by the ocean could revolutionize offshore oil and natural gas extraction by providing real-time monitoring of the subsurface while lessening the impact on marine life.

Arctic ice cap slides into the ocean

January 23, 2015 10:40 am | by Univ. of Leeds | News | Comments

Satellite images have revealed that a remote Arctic ice cap has thinned by more than 50 m since 2012 and that it’s now flowing 25 times faster. A team led by scientists from the Centre for Polar Observation and Modelling (CPOM) at the Univ. of Leeds combined observations from eight satellite missions, including Sentinel-1A and CryoSat, with results from regional climate models, to unravel the story of ice decline.

Two lakes beneath Greenland’s ice gone within weeks

January 22, 2015 8:57 am | by Pam Frost Gorder, The Ohio State Univ. | News | Comments

Researchers who are building the highest-resolution map of the Greenland Ice Sheet to date have made a surprising discovery: two lakes of meltwater that pooled beneath the ice and rapidly drained away. One lake once held billions of gallons of water and emptied to form a mile-wide crater in just a few weeks. The other lake has filled and emptied twice in the last two years.

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Ocean floor dust gives new insight into supernovae

January 20, 2015 10:32 am | by Phil Dooley, The Australian National Univ. | News | Comments

Scientists plumbing the depths of the ocean have made a surprise finding that could change the way we understand supernovae, exploding stars way beyond our solar system. They have analyzed extraterrestrial dust thought to be from supernovae that has settled on ocean floors to determine the amount of heavy elements created by the massive explosions.

Study: Sea level rise accelerating more than once thought

January 14, 2015 1:38 pm | by Seth Borenstein, AP Science Writer, Associated Press | News | Comments

  The world's oceans are now rising far faster than they did in the past, a new study says. The study found that for much of the 20th century the sea level was about 30% less than earlier research had figured. But that's not good news, scientists say, because about 25 years ago the seas started rising faster and the acceleration in 1990 turns out to be more dramatic than previously calculated.

How rivers of meltwater on Greenland’s ice sheet contribute to rising sea levels

January 13, 2015 8:31 am | by Meg Sullivan, Univ. of California, Los Angeles | Videos | Comments

As the largest single chunk of melting snow and ice in the world, the massive ice sheet that covers about 80% of Greenland is recognized as the biggest potential contributor to rising sea levels due to glacial meltwater. Until now, however, scientists’ attention has mostly focused on the ice sheet’s aquamarine lakes and on monster chunks of ice that slide into the ocean to become icebergs.

Scientists: Great Lakes teeming with tiny plastic fibers

January 9, 2015 3:36 pm | by John Flesher, AP Environmental Writer, Associated Press | News | Comments

Scientists who have reported that the Great Lakes are awash in tiny bits of plastic are raising new alarms about a little-noticed form of the debris turning up in sampling nets: synthetic fibers from garments, cleaning cloths and other consumer products. They are known as "microfibers", exceedingly fine filaments made of petroleum-based materials such as polyester and nylon that are woven together into fabrics.

Algae blooms create their own favorable conditions

January 8, 2015 8:22 am | by John Cramer, Dartmouth College | News | Comments

Fertilizers are known to promote the growth of toxic cyanobacterial blooms in freshwater and oceans worldwide, but a new multi-institution study shows the aquatic microbes themselves can drive nitrogen and phosphorus cycling in a combined one-two punch in lakes.

Warmer Pacific Ocean could release millions of tons of seafloor methane

December 9, 2014 5:29 pm | News | Comments

Off the West Coast of the United States, methane gas is trapped in frozen layers below the seafloor. New research from the University of Washington shows that water at intermediate depths is warming enough to cause these carbon deposits to melt, releasing methane into the sediments and surrounding water.

AUV provides first 3-D images of underside of Antarctic sea ice

November 26, 2014 8:03 am | by Peter West, NSF | News | Comments

A National Science Foundation-funded research team has successfully tested an autonomous underwater vehicle (AUV) that can produce high-resolution, 3-D maps of Antarctic sea ice. SeaBED, as the vehicle is known, measured and mapped the underside of sea-ice floes in three areas off the Antarctic Peninsula that were previously inaccessible.

Salinity matters when it comes to sea level changes

November 21, 2014 9:33 am | by Anne M. Stark, Lawrence Livermore National Laboraotry | News | Comments

Using ocean observations and a large suite of climate models, Lawrence Livermore National Laboratory (LLNL) scientists have found that long-term salinity changes have a stronger influence on regional sea level changes than previously thought.

Subducting oceanic plates are thinning adjacent continents

November 13, 2014 4:28 pm | by Mike Williams, Rice Univ. | News | Comments

The continental margins of plates on either side of the Atlantic Ocean are thinner than expected, and an international team led by a Rice Univ. scientist is using an array of advanced tools to understand why. The viscous bottom layers of the continental shelves beneath the Gibraltar arc and northeastern South America are literally being pulled off by adjacent subducting oceanic plates.

Scientists identify new driver behind Arctic warming

November 4, 2014 8:45 am | by Dan Krotz, Lawrence Berkeley National Laboratory | News | Comments

Scientists have identified a mechanism that could be a big contributor to warming in the Arctic region and melting sea ice. The research was led by scientists from Lawrence Berkeley National Laboratory. They studied a long-wavelength region of the electromagnetic spectrum called far infrared. It’s invisible to our eyes but accounts for about half the energy emitted by the Earth’s surface. This process balances out incoming solar energy.

Researchers track ammonium source in open ocean

November 1, 2014 11:49 am | by Kevin Stacey, Brown Univ. | News | Comments

To understand the extent to which human activities are polluting Earth’s atmosphere and oceans, it’s important to distinguish human-made pollutants from compounds that occur naturally. A recent study co-authored by a Brown Univ. professor does just that for ammonium, a compound that is produced by human activities like agriculture, as well as by natural processes that occur in the ocean.

Where did the Deepwater Horizon oil go?

October 28, 2014 11:23 am | News | Comments

Where's the remaining oil from the 2010 Deepwater Horizon disaster in the Gulf of Mexico? The location of 2 million barrels of oil thought to be trapped in the deep ocean has remained a mystery. Until now: A national team of scientists has discovered the path the oil followed to its resting place on the Gulf of Mexico sea floor.

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