Sentences with phrase «in ocean sediment»

It remains a bit speculative just what they are, but there are a number of plausible mechanisms: outgassing from warming ocean waters, carbon released from warming soils, methane from thawing permafrost, methane from clathrates in ocean sediment.

The pulses of growth match cooling periods documented in ocean sediment cores and in the continuous cores from Iceland and Baffin Island, suggesting that glaciers have responded in sync across the North Atlantic for at least the past 4,000 years, the authors write.

Indeed, its a very important paper in the history of climate, linking observed cycles in ocean sediment cores to orbital forcing periodicities.

Although seagrasses account for less than 0.2 % of the world's oceans, they sequester approximately 10 % of the carbon buried in ocean sediment annually (27.4 Tg of carbon per year) *.

Indeed, its a very important paper in the history of climate, linking observed cycles in ocean sediment cores to orbital forcing periodicities.

The pulses of growth match cooling periods documented in ocean sediment cores and in the continuous cores from Iceland and Baffin Island, suggesting that glaciers have responded in sync across the North Atlantic for at least the past 4,000 years, the authors write.

Not even a massive outpouring of carbon 56 million years ago (recorded in this ocean sediment core as the 25 - centimeter - long red band) comes close, a new study suggests.

Forams have an exceptionally long fossil record, spanning more than 540 million years, and they are often well - preserved in ocean sediments.

This will improve our ability to reconstruct ocean conditions from the fossil diatoms preserved in the ocean sediments.

Bacteria in ocean sediments appear to string together nanowires to connect complementary but spatially separated chemical processes, according to a new study.

Other hostile conditions deep in ocean sediments, such as scarce nutrients, high pressure, or extreme salinity, probably set life's limit in some places.

Sure enough, synthetic lint was relatively common in both treated wastewater and in ocean sediments from sites where sewage sludge had been dumped.

Using sophisticated three - dimensional laser scanning and digital photograph analyses, sections of the rocks revealed burrows or trails left behind by trilobites and their prey — often worm - like creatures — in ocean sediments.

This time Becker, Basu, and four other coauthors described a submarine hump called Bedout High that is buried in ocean sediments 100 miles off the northwest coast of Australia.

The study focuses on one such removal process, burial of phosphorus in the organic matter in ocean sediments.

Trapped in ocean sediments near continents lie ancient reservoirs of methane called methane hydrates.

So as the creatures churned up more sediment layers, more phosphate built up in ocean sediments and less was found in seawater.

«All the protactinium in the ocean is buried in ocean sediments.

By comparing expected ratios of thorium and protactinium in those ocean sediments to observed amounts, the authors showed that protactinium was being swept out of the Arctic before it could settle to the ocean bottom.

Carbonic acid dissociated to form hydrogen ions, which found their way into the structures of weathering minerals, and bicarbonate, which was carried down rivers and streams to be deposited as limestone and other minerals in ocean sediments.

Coastal habitats cover less than 20 % of the total ocean area, but account for approximately half of the total carbon sequestered in ocean sediments.

In this case, have enough dissolvable CaCO3 in ocean sediments to neutralize about 5000 Gton of C, which is about all of the coal and everything else.

Bacteria produce methane as they decompose organic matter in the ocean sediments, and in cold, high - pressure environments, methane hydrates will form.

Anaerobic methane oxidation was discovered in 1974 and is thought to account for up to 90 % of methane release from melted clathrate in ocean sediments.

If exposure to a more acidic pH caused a decline in some sea urchin populations, how might this affect the storage of carbon in ocean sediments?

Dr Gauci told us that the authors had made an «enormous leap» assuming that the entire 50 billion tonnes of frozen methane trapped in ocean sediments would end up in the atmosphere over a ten - year period.

HS12 uses the oxygen isotope record in ocean sediments Zachos et al. (2008) to estimate past changes of sea level and ocean temperature, and thus obtain a largely empirical estimate of climate sensitivity.

The changing levels of windblown dust in the ocean sediments provide scientists with clues to Africa's climate and how it has changed over time.

Methane hydrates are 3D ice - lattice structures with natural gas locked inside, and are found both onshore and offshore — including under the Arctic permafrost and in ocean sediments along nearly every continental shelf in the world.

Stocks Under conditions of high pressure, high methane concentration, and low temperature, water and methane can combine to form icy solids known as methane hydrates or clathrates in ocean sediments.

Although the overall rate of methane production in ocean sediments is fairly slow, over millions of years, substantial reservoirs of methane hydrate have accumulated in the world's ocean margins.

With such elevated sea surface temperatures it is perhaps unsurprising that fossil evidence in ocean sediments indicates a mass extinction event during the PETM: the seas would have become thermally stratified, cutting off the oxygen supply to deep waters and killing everything reliant upon it.

But doubts about this hypothesis surfaced in 1982, when Lloyd Keigwin found evidence in ocean sediments that the closing of the Isthmus of Panama had influenced ocean circulation more than a million years earlier.

The continental glaciations of the Pleistocene left signatures on the landscape in the form of glacial deposits and landforms; however, the best knowledge of the magnitude and timing of the various glacial and interglacial periods comes from oxygen isotope records in ocean sediments.

Cross-posted from Daniel Cressey on The Great Beyond Cyclones appear to be responsible for a large amount of organic carbon tied up in ocean sediments.

Not exact matches

Carried within the water column, accumulating on the ocean bottom or becoming entrained in marine sediments — a spill of Alberta bitumen might prove impossible to contain.

Approximately 90 % of excavated seabed would be returned to the ocean floor along with tailings, creating a sediment plume approximately 1000 square kilometres in size.

Because, speculates Hutton, God through final causation created a cycle whereby sediments sink and consolidate in the oceans and later are uplifted by the Earth's interior heat.

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.

The aim of my PhD is to use the distribution of diatom species preserved in sediment cores across the Scotia Sea to reconstruct the position of major ocean boundaries and water masses through time.

A 9.0 - magnitude earthquake off the coast of the Aleutian Islands triggered the mighty wave, which left behind up to nine shipping containers worth of ocean sediment in a sinkhole on the island of Kauai.

Climate scientists find the last glacial period interesting because ice cores in Greenland and ocean sediment cores have shown that during this period there were sharp shifts in global temperatures.

«This was a bit of a surprise because when we think of sediment in the ocean, we think of it as sinking vertically, originating from someplace above.

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 study conclusions are the result of creating a detailed computer model of chemical reactions that took place in the ocean's sediments.

«No one was really looking at how the isotopic signals that were being generated in the atmosphere and the ocean were being transformed in the sediment.

The team, led by Dr Kira Rehfeld and Dr Thomas Laepple, compared the Greenland data with that from sediments collected in several ocean regions around the globe, as well as from ice - core samples gathered in the Antarctic.

Comparing layers in the ice - core samples and ocean sediments has allowed researchers to deduce e.g. how the average temperature on Earth has changed over time, and also how great the variability was.

Somewhere in the sediments and rocks beneath the ocean floor, it gets too hot for living things.

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.