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News articles about "Sediment"

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

Managing specialized microbes to clean stubborn chemicals from environment

Chlorinated chemicals perform a host of societally useful functions but they also have a dark side Once their use life has ended such agents often become environmental contaminants sometimes resistant to bioremediation In a series ... - Read More

Babbling brooks adding to climate change?

Studying stream bubbles isn't exactly a walk in the park What with the mud and ticks the long days hiking and swimming through mucky streams the sun exposure and scratching brush But in the end ... - Read More

Buried fossil soils found to be awash in carbon

Soils that formed on Earth's surface thousands of years ago and that are now deeply buried features of vanished landscapes have been found to be rich in carbon adding a new dimension to our planet's ... - Read More

Rhode Island: Nitrogen cycle differs in bay and sound

A new study reports that anammox a key process in the nitrogen cycle is barely present in Narragansett Bay even though it's a major factor just a little farther out into Rhode Island Sound Scientists ... - Read More

Dust in the wind drove iron fertilization during ice age

Researchers from Princeton University and the Swiss Federal Institute of Technology in Zurich have confirmed that during the last ice age iron fertilization caused plankton to thrive in a region of the Southern Ocean The ... - Read More

True value of cover crops to farmers, environment

Planting cover crops in rotation between cash crops widely agreed to be ecologically beneficial is even more valuable than previously thought according to a team of agronomists entomologists agroecologists horticulturists and biogeochemists from Penn State's ... - Read More

Understanding how mountains and rivers make life possible

Favorable conditions for life on Earth are enabled in part by the natural shuttling of carbon dioxide from the planet's atmosphere to its rocky interior and back again Now Stanford scientists have devised a pair ... - Read More
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