Sentences with phrase «seafloor sediment»

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.

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.

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:

Clues in seafloor sediments reveal that relatively warm water beneath western Antarctic ice shelves, a major factor in today's massive ice sheet retreat, also fueled some past ice loss.

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.

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

These single - celled plankton produce calcite skeletons that are preserved in seafloor sediments after death.

The fossils had been entombed in rocks laid down as seafloor sediments sometime between 25 million and 28 million years ago, says Daniel Ksepka, a vertebrate paleontologist who is now at the Bruce Museum in Greenwich, Connecticut.

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.

By studying tiny shells in seafloor sediment cores retrieved from Pine Island Bay in West Antarctica, the team has reconstructed the interactions between the ice and ocean from 11,000 years ago until present.

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 continued study will help estimate how long it takes to decrease the level of radiocesium in seafloor sediments near the Fukushima Daiichi Nuclear Power Plant.

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

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.

To see how bottom trawling is changing the ocean's bottom, ecologist Antonio Pusceddu of the Marche Polytechnic University in Ancona, Italy, and his team took seafloor sediment samples at trawled and untouched sites off Spain's northeastern coast between 500 and 2,000 meters below the surface.

«Seafloor sediments appear to enhance Earthquake and Tsunami danger in Pacific Northwest.»

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

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

Yet, we do not fully understand the circumstances under which seafloor sediments represent a source or a sink for these essential elements,» emphasizes the biogeochemist.

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.

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

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

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.

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.

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.

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

Analysis of seafloor sediment reveals lower oxygen levels in the ocean when the planet heated up 55.9 million years ago

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

Two days after that, the scientists deployed a geothermal probe, sending it 1.5 meters into the seafloor sediment.

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.

The modelers begin with data on Pliocene temperatures — such as how hot it got on Ellesmere Island or in the North Atlantic Ocean, as revealed by plant fossils or seafloor sediments.

Looking deeper into the seafloor sediment than did Goldfinger, Anne Trehu of Oregon State University and her colleagues mapped the history of the ridge's response to the squeezing and folding that it endures.

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.

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 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.

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.

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

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

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.

Studies indicate that seafloor sediments beneath the Kara, Barents and East Siberian seas in the Arctic Ocean, as well as the Sea of Okhotsk and the Barents Sea in the North Pacific, have large reservoirs of the planet - warming greenhouse gas, says study coauthor Scott M. Elliott, a marine biogeochemist at

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.

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.

Anaerobic microbial breakdown of decaying phytoplankton produces hydrogen sulfide gas in the seafloor sediment, and the gas buildup is periodically released, rising and oxidizing as it approaches the water surface.

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.

The aim of the IODP expeditions is to recover data recorded in seafloor sediments and rocks and to monitor sub seafloor environments.

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.

Great abundances of silica and opal (the preserved material from the phytoplankton shells) in seafloor sediments are evidence of both the blooms and the strong upwelling.