Sentences with phrase «seafloor sediments»

The expedition started from the well - established fact that an enormous amount of methane is frozen into a kind of ice known as methane hydrate, buried in seafloor sediments and containing perhaps twice as much carbon as all the world's fossil - fuel reserves combined.

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.

Seafloor sediments show that during past ice ages, more iron - rich dust blew from chilly, barren landmasses into the oceans, apparently producing more algae in these areas and, presumably, a natural cooling effect.

They build shells from calcite, which are often well preserved in seafloor sediments after the foraminifera die and sink to the ocean bottom.»

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

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:

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.

Formed some 60 million years ago, these concretions conglomerated from ancient seafloor sediments until shoreline erosion gradually unearthed them from the cliffs.

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.

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.

Those ecosystem changes slow decomposition that normally recycles plant and animal matter back into the ecosystem after organisms die, resulting in more organic matter accumulating in seafloor sediments, the researchers report February 10 in Science Advances.

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.

Trapped in old seafloor sediments, the water is more than 100 million years old and twice as salty as modern seas

High - resolution seismic reflection profiles showed a former land surface buried in the seafloor sediments.

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.

Mud volcanoes burble up during earthquakes because the shaking releases mud and water that are trapped beneath barriers in seafloor sediments.

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.

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.

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

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.

Previous evidence from seafloor sediments elsewhere is consistent with two Paleocene - Eocene carbon pulses, which «means we don't think this is something is unique to northern Wyoming,» Bowen says.

Its long burial beneath seafloor sediments isolated it from cosmic rays that could have triggered WIMP - masking radioactivity within the lead.

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.

The marine mammal may even have had short, walrus - like whiskers to better sense prey while grubbing through seafloor sediments, the researchers speculate.

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.

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.

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

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.

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.

Ettema's team did not actually see the cells: they used computational methods to piece together the genomes from the DNA found in the seafloor sediment.

The rock is an extrusion from a hydrothermal vent, not seafloor sediment.

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.

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.

In the climate research community, ice cores are generally considered the gold standard, because their layers are highly consistent, unlike sediment layers from the seafloor, which are frequently marred by tectonic shifts, currents or marine organisms.

This past June scientists at NASA's Stennis Space Center in Mississippi reported that the eyewall's extreme conditions can stir up ocean currents 300 feet below the surface, disrupting sediment and organisms on the seafloor for as long as a week after the storm subsides.

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.

The hydrate is extremely unstable; as it gets buried deeper by fresh sediment falling on the seafloor above, it warms enough to release its methane again.

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

«And the gas just cracks the sediment and migrates right up to the seafloor.»

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.

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.