Sentences with phrase «of seafloor sediments»

A recent study by Moffitt and colleagues of seafloor sediments from the end of the last Ice Age, around 10,000 to 17,000 years ago, revealed that Pacific Ocean ecosystems from the Arctic to Chile «extensively and abruptly lost oxygen when the planet warmed through deglaciation,» she said.

On the last day of a research cruise off the coast of Antarctica this spring, Hamilton College marine geologist Eugene Domack and his team lowered a video camera overboard to capture images of the seafloor sediments they had been studying.

This is an acorn worm, a scavenger of seafloor sediment that the researchers found in the North Atlantic.

The idea is that as they dug and wiggled, these early multicellular creatures — some were likely worms as long as 40 cm — exposed new layers of seafloor sediment to the ocean's water.

The researchers studied cores of seafloor sediment representing 500,000 years of deposition, spanning about 6,000 miles of the Pacific equator, from near Papua New Guinea to near Ecuador's Galapagos Islands — nearly a quarter of the globe's girth.

Not exact matches

The foundation of the research involved tracking the changes in ocean circulation in new detail by studying three sediment cores extracted from the seafloor of the Gulf of Mexico in 2010 during a scientific cruise.

Essentially an x-ray of the seafloor, this technique allowed the team to reconstruct the thickness and likely composition of buried sediment layers.

In fact, the cells show so few signs of life that it wasn't until 2011 that researchers confirmed that microbes in sediments below the seafloor are, indeed, living.

The team analysed the chemical composition of tiny shells built by organisms (foraminifera) that had lived in the water column and at the sea bottom before their shells became embedded in the seafloor sediments.

Led by Ken Buesseler, a senior scientist and marine chemist at the Woods Hole Oceanographic Institution (WHOI), the team found that a small fraction of contaminated seafloor sediments off Fukushima are moved offshore by typhoons that resuspend radioactive particles in the water, which then travel laterally with southeasterly currents into the Pacific Ocean.

His team bored several three - meter - long columns of sediment from parts of the seafloor that were covered by Larsen B until its collapse.

The researchers drilled down 1,500 meters below the seafloor in two places off the coast of Sumatra, extracting narrow cylinders of sediment.

Working in remote conditions, researchers in the winter of 2012 ran a drill through 450 meters of ice and 500 meters of ocean to collect seafloor sediments on either side of this lost bulwark.

In addition to a marine biologist's typical tools — water samplers to measure salinity and temperature, plankton nets — the team's toolbox will hold cameras, coring systems to collect seafloor sediment, and hydroacoustic equipment to map the topography of the now - exposed seabed.

IODP is a collaboration of scientists from 23 countries; the organization coordinates voyages to study the history of the Earth recorded in sediments and rocks beneath the seafloor.

Methane gets squeezed out of the deepest layers of sediments like water from a sponge and migrates up toward the seafloor.

Hundreds of yards below the seafloor, microbes called archaea produce methane from hydrogen and carbon extracted from organic sediments.

The purpose was to create a bathymetric picture of the sea bottom and to collect reflection seismic data, which allows researchers to peer into the sediments and rocks underneath the seafloor.

The levees disconnect the river and an estimated 210 million tons of sediment that would naturally flow down to the delta and build the wetlands and the seafloor.

During the 20th century, thousands of dams were built on Mississippi River tributaries stopping the flow of fine silt, clay and other sediment from reaching the delta and seafloor to offset erosion.

In addition, the total amount of cesium retained more than 3 feet deep in the sands is higher than what is found in sediments on the seafloor offshore of the beaches.

The shale, named for the town of Eagle Ford, TX, is a geologic remnant of the ancient ocean that covered present day Texas millions of years ago, when the remains of sea life (especially ancient plankton) died and deposited onto the seafloor, were buried by several hundred feet of sediment, eventually turning into the rich source of hydrocarbons we have today.The shale was first tapped in 2008 and now has around 20 active fields good producing over 900 million cubic feet per day of natural gas.

Knudson and Ravelo based their findings on an analysis of carbon and oxygen isotopes in the calcium carbonate shells of tiny marine organisms called foraminifera, which are preserved in seafloor sediments.

Surprise find The team's actual mission was to survey ocean currents near the Ross Ice Shelf, a slab of ice extending more than 600 miles (970 kilometers) northward from the grounding zone of the West Antarctic Ice Sheet into the Ross Sea, to model the behavior of a drill string, a length of pipe extending to the seafloor which delivers drilling fluids and retrieves sediment samples.

Dr. Edwards took deep sediment core samples to further understand the geology of the region including the unusual seafloor mound where these samples were collected.

The primary purpose of the expedition was to map the Arctic seafloor and the sediments beneath.

Look at these distances: It requires almost a thousand kilometers of seafloor spreading to record the same amount of time that you find in 150 meters of mountain sediment, so the earth is running two magnetic tape recorders.

Now seafloor sediments reveal that Larsen B's grounding line had remained stable for thousands of years before the ice shelf's collapse.

The lack of oxygen on the local seafloor kept the area free of bottom - dwelling scavengers, and sediment quickly covered the animals» corpses, preserving them in unprecedented detail.

In addition to methane hydrates, carbon - rich permafrost that is tens of thousands of years old — and found throughout the Arctic on land and in seafloor sediments — can produce methane once this material thaws in response to warming.

The first Ediacaran to begin crawling around would have discovered a world devoid of predatory animals, with a seafloor covered either in thick bacterial mats or toxic sediment and, possibly, a climate thawing from a worldwide glaciation event known as «Snowball Earth.»

Finally, they used a seafloor - crawling robot, the Benthic Rover, to measure the amount of oxygen being consumed by animals and microbes in the sediment.

When dozens of meters of new sediment settle on the seafloor, the solid compounds dissociate at the base of the hydrate stability zone, while new hydrates can form at the upper end of the stability zone.

From this, they calculated that sinkers contribute 7.6 grams of carbon per square meter of seafloor each year, an uncanny match to a food deficit found in a study using sediment traps.

They suspended conical «sediment traps» above the seafloor to collect and measure the amount of marine snow falling through the water.

Researchers of the Senckenberg Biodiversity and Climate Research Centre, the Goethe University in Frankfurt and the University of Toronto have now detected evidence of this oceanographic event and an earlier sudden sea - level rise in the fossils of tiny calcifying marine algae preserved in seafloor sediments in the Aegean Sea.

Not only is there a much higher diversity of microbes under the seafloor than originally thought, large and active populations exist much deeper in the sediments than was believed, the team reports 21 July in Nature.

Meanwhile, researchers at the University of Tokyo reported at a conference in Tokyo in June that they have discovered seafloor sediments in Japanese waters that contain an estimated 6.8 million tonnes of rare - earth elements.

This picture may be about to change in light of a study of deep - sea rocks and sediments led by John Parkes, a microbiologist at Cardiff University in the U.K.. By visiting oil - drilling projects at two sites in the Pacific in 2002, Parkes and colleagues obtained samples as deep as 400 meters beneath the seafloor.

Karla Knudson analyzed isotopes in the shells of tiny marine organisms preserved in seafloor sediments to find chemical signatures of past water temperatures and other oceanographic conditions.

They lived at the bottom of shallow seas and were able to bury into the muddy sediment of the seafloor.

Abrupt Rise in Sea Level Delayed the Transition to Agriculture in Southeastern Europe (22/03/2018) Researchers of the Senckenberg Biodiversity and Climate Research Centre, the Goethe University in Frankfurt and the University of Toronto have detected evidence of this oceanographic event in the fossils of tiny calcifying marine algae preserved in seafloor sediments in the Aegean Sea.

It discusses the clay mineral composition of sediment samples taken from the seafloor surface and marine cores in order to decipher spatial and temporal changes in the sediment provenance.

Their data from the other pole, from the Antarctic ice sheet, bring us an important step closer to nailing down the mechanism of the mysterious abrupt climate jumps in Greenland and their reverberations around the world, which can be identified in places as diverse as Chinese caves, Caribbean seafloor sediments and many others.

Her work immediately brought to mind the ceramics of Joan Lederman, an artist in Woods Hole, Mass., who creates glazes from seafloor sediments retrieved by oceanographers roaming the world from the nearby Woods Hole Oceanographic Institution:

Large amounts of methane are stored in seafloor sediments as gas hydrate, and as these melt the gas is released into the water column.

Data on bathymetry, demersal fish, sponges and sediments, and oceanographic data, were used to identify a suite of unique seafloor bioregions comprising 41 provinces, three depth - related biomes on the continental slope, and geomorphic units that represent clusters of geomorphic features around the EEZ.

Methane hydrates that are on the edge of stabilization can be disturbed by global warming in two additional ways, temperature and pressure: Warming of the Earth's crust as heat penetrates sediments on the seafloor.

Most of Earth's gas hydrates occur at low saturations and in sediments at such great depths below the seafloor or onshore permafrost that they will barely be affected by warming over even 1000 yr.

Nearly four years ago, geological surveys of the Arctic Ocean seafloor revealed the presence of shells buried deep in its sediment.