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News articles about "Sediment"

Smothered oceans: Extreme oxygen loss in oceans accompanied past global climate change

Seafloor sediment cores reveal abrupt extensive loss of oxygen in the ocean when ice sheets melted roughly 10 000 17 000 years ago according to a study from the University of California Davis The findings ... - Read More

Scientists search for new ways to deal with U. S. uranium ore processing legacy

Researchers at the Department of Energy's SLAC National Accelerator Laboratory are trying to find out why uranium persists in groundwater at former uranium ore processing sites despite remediation of contaminated surface materials two decades ago ... - Read More

Fossils survive volcanic eruption to tell us about the origin of the Canary Islands

The most recent eruption on the Canary Islands at El Hierro in 2011 produced spectacularly enigmatic white floating rocks that originated from the layers of oceanic sedimentary rock underneath the island An international team of ... - Read More

New sulfate-breathing species discovered beneath ocean crust: Third of Earth's biomass in largely uncharted environment

Two miles below the surface of the ocean researchers have discovered new microbes that breathe sulfate The microbes which have yet to be classified and named exist in massive undersea aquifers networks of channels in ... - Read More

Mercury from gold mines accumulates far downstream

Researchers have determined that the health risks taken on by artisanal small scale gold miners extend far beyond the miners themselves Based on a study of gold mining operations in Peru the miners' practices not ... - Read More

Oil sand mining is not polluting Athabasca Delta, new sampling method reveals

A new study into the pre industrial baseline levels of heavy metals in sediment carried by the Athabasca River shows that emissions from the Alberta oil sands and other human activities have not yet increased ... - Read More

Coral reveals long-term link between Pacific winds, global climate

New research indicates that shifts in Pacific trade winds played a key role in twentieth century climate variation a sign that they may again be influencing global temperatures The study led by scientists at the ... - Read More

NASA Goddard instrument makes first detection of organic matter on Mars

The team responsible for the Sample Analysis at Mars SAM instrument suite on NASA's Curiosity rover has made the first definitive detection of organic molecules at Mars Organic molecules are the building blocks of all ... - Read More

Floodplain evolution in Amazon Basin driven by sediment supply

A new study of the Amazon River basin shows lowland rivers that carry large volumes of sediment meander more across floodplains and create more oxbow lakes than rivers that carry less sediment The findings have ... - Read More

Scientists replicate the tide with two buckets, aquarium tubing, and a pump

Rachel MacTavish is growing salt marsh plants in microcosms that replicate the tide She assembled them in an outdoor greenhouse at the Sapelo Island National Estuarine Research Reserve in Georgia USA with buckets from a ... - Read More

Breathing sand: New measurement technique detects oxygen supply to bottom of North Sea

New analytical methods show for the first time how the permeable sandy sediment at the bottom of the North Sea is supplied with oxygen and which factors determine the exchange Because the metabolic rate is ... - Read More

Carbonate rocks are unrecognized methane sink

Since the first undersea methane seep was discovered 30 years ago scientists have meticulously analyzed and measured how microbes in the seafloor sediments consume the greenhouse gas methane as part of understanding how the Earth ... - Read More

Methods will reverse arsenic danger in Bangladesh water supply

Arsenic poisoning is widespread in Bangladesh where ground water is contaminated by runoff from the Himalayas Now researchers have developed two simple and cheap methods that well drillers can use to tap arsenic safe drinking ... - Read More

Nanoparticles accumulate quickly in wetlands: Aquatic food chains might be harmed by molecules 'piggybacking' on carbon nanoparticles

A Duke University team has found that nanoparticles called single walled carbon nanotubes accumulate quickly in the bottom sediments of an experimental wetland setting an action they say could indirectly damage the aquatic food chain ... - Read More

U.S. cityscapes show consistent patterns of 'urban evolution'

Most people think of city landscapes as simpler diminished versions of the wild forests and free flowing streams found in remote places But in a series of studies published Sept 10 2014 in a special ... - Read More

US cityscapes show consistent patterns of 'urban evolution'

Most people think of city landscapes as simpler diminished versions of the wild forests and free flowing streams found in remote places But in a series of studies published Sept 10 2014 in a special ... - Read More

Declining levels of acidity in Sierra Nevada lakes, study concludes

California's water supply depends on a clean snow pack and healthy mountain lakes The lakes receive a large amount of runoff in the spring from the melting snowpack If the snowpack is polluted the lakes ... - Read More

Discrepancy in Greenland temperatures during end of last ice age resolved

A new study of three ice cores from Greenland documents the warming of the large ice sheet at the end of the last ice age resolving a long standing paradox over when that warming occurred ... - Read More

Ancient Arctic sharks tolerated brackish water 50 million years ago

Sharks were a tolerant bunch some 50 million years ago cruising an Arctic Ocean that contained about the same percentage of freshwater as Louisiana's Lake Ponchatrain does today says a new study involving the University ... - Read More

Ancient ocean currents may have changed pacing and intensity of ice ages: Slowing of currents may have flipped switch

For decades climate scientists have tried to explain why ice age cycles became longer and more intense about 900 000 years ago switching from 41 000 year cycles to 100 000 year cycles In a ... - Read More
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