Sentences with phrase «ocean bottom water»

Heuzé, C., Heywood, K. J., Stevens, D. P. & Ridley, J. K. Southern Ocean bottom water characteristics in CMIP5 models.

During cooling periods, when ice sheets are expanding, ocean bottom water accumulates heavy oxygen isotopes (oxygen 18).

Thus, iron - fertilized diatom blooms may sequester carbon for timescales of centuries in ocean bottom water and for longer in the sediments.

Which lead me to this: http://www.npr.org/2012/07/18/156976147/can-adding-iron-to-oceans-slow-global-warming then to this study: http://www.nature.com/nature/journal/v487/n7407/full/nature11229.html Money shot (last line in abstract):» Thus, iron - fertilized diatom blooms may sequester carbon for timescales of centuries in ocean bottom water and for longer in the sediments.

The oxygen isotopic composition and temperature of Southern Ocean bottom waters during the last glacial maximum.

The ocean bottom waters are at 1 to 3 degrees Celsius everywhere year round, at depths over 1000 meters, while the seas average over 4000 meters in depth worldwide.

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.

«Harvey passed through an area where there was warm water all the way down to the bottom of the ocean,» Kithil said.

And it is a child's country, which is described by the water's soft, ambiguous edge, and it is bewildering to stand sentry there, unsuccessfully disguised as a heron, with your large white feet sticking out, to listen to (and wistfully try to recall) the wild laughter, the shrieks, the singular tuneless tunes children drone as they march in intent circles; and to watch them groping into their shadows for shells on the roily bottom or building improbable fortifications to keep the ocean where it belongs («What arc - you doing?»

Optical sensors installed on ships, for instance, can determine ocean water color that reflects the activity of micro-algae at the bottom of the food chain and, when examined alongside satellite color observations, can support extrapolations about what's happening in a given area of ocean.

For the ocean floor is a record, an eons - old accumulation of whatever has sunk down through the water to the bottom of the sea.

If the planet is covered by an immense amount of water, the pressure at the bottom of the ocean will increase to such an extent that water occurs in the form of «Ice VII,» which does not exist on Earth.

The debris probably was dredged up from the bottom of the moon's ocean by water percolating through the rocky core, and then...

That might include draining away the water that lubricates the bottom of an ice sheet, speeding its progress to the sea, or installing barriers to prevent warming ocean waters from hitting the bottom of such glaciers and hastening meltdown.

The ocean conveyor moves heat and water between the hemispheres, along the ocean bottom.

But scientists increasingly attribute much of the observed grounding line retreat — particularly in West Antarctica — to the influence of warmer ocean water seeping beneath the ice shelves and lapping against the bases of glaciers, melting the ice from the bottom up.

Along Axial's flanks, fields of geysers suddenly pierced the ocean bottom, shooting up superheated jets of water darkened with heavy concentrations of minerals from Earth's crust.

These algae then creep in, extending their tendrils over close to 60 % of the ocean bottom, Hay estimates, and turning waters a sludgy green.

Methane, the carbon - hydrogen compound that is the main component of natural gas and cow flatulence, gets trapped inside crystalline cages of frozen water in the muddy ocean bottom.

This would shut down a global ocean circulation system that is driven by dense, salty water falling to the bottom of the north Atlantic and that ultimately produces the Gulf Stream.

In recent years, say scientists at the National Oceanic and Atmospheric Administration, these baleen whales that typically sift out little crustaceans from the bottom are now eating mysid shrimp and even krill in ocean waters.

During a trawl for sea creatures on the bottom of the Arctic Ocean last month, scientists on the RV Helmer Hansson in Rijpfjorden on the island of Spitsbergen, Norway, retrieved a 7 - meter - long log infested with living shipworms on the sea floor under 250 meters of water.

The warm waters give up their heat in the bitterly cold regions monitored by OSNAP, become denser, and sink, forming ocean - bottom currents that return southward, hugging the perimeter of the ocean basins.

Looking through the portholes of the submersible ALVIN near the bottom of the Pacific Ocean in 1979, American scientists saw for the first time chimneys, several meters tall, from which black water at about 300 degrees and saturated with minerals shot out.

Eventually, it makes its way back to the surface as the ocean's bottom water circulates and rises anew near the equator (although carbon buried in sediment might stay buried longer).

But the dominant theory nowadays is that primitive microorganisms first assembled in hot, chemical - rich water at hydrothermal vents at the bottom of the ocean.

Beneath half a mile of frigid ocean water, at the bottom of a deep trough that never sees the light of day, lay a chiaroscuro world of grayish bacteria and giant brilliant white clams.

Tides, storms and other disturbances in shallow water will stir up the bottom, while further from shore, where the water is deeper, turbulence can not reach the ocean floor, allowing sediment to settle undisturbed.

«Antarctic bottom waters freshening at unexpected rate: Shift could disturb ocean circulation and hasten sea level rise, researchers say.»

In a paper published January 25 in Science Advances, a team led by WHOI oceanographers Viviane Menezes and Alison Macdonald report that Antarctic Bottom Water (AABW) has freshened at a surprising rate between 2007 and 2016 — a shift that could alter ocean circulation and ultimately contribute to rising sea levels.

Known as the Antarctic Bottom Waters (AABW), these deep, cold waters play a critical role in regulating circulation, temperature, and availability of oxygen and nutrients throughout the world's oceans.

«This study shows for the first time that the oxidation of hydrogen sulfide and ammonia from the bottom waters could be a major contributor to lower pH in coastal oceans and may lead to more rapid acidification in coastal waters compared to the open ocean,» said Cai, the paper's lead author and an expert in marine chemistry and carbon's movement through coastal waters.

This graphic illustrates how Cassini scientists think water interacts with rock at the bottom of the ocean of Saturn's icy moon Enceladus, producing hydrogen gas.

Most of the deposits, some small and some large, are buried in or below permafrost and sediments in the ocean bottom along continental margins — where shallow offshore waters slope down toward the deeper ocean floor.

These organisms are important because they churn up sediments from the bottom of the ocean, a process known as «bioturbation», playing a vital role in returning nutrients to surrounding water as food for other creatures.

And scientists now know that the underwater topography — the hills, slopes and crevices at the bottom of the ocean, where the ice meets the sea — is a critical influence on just how much ice actually touches the water.

Particles will float to shore, drift out to the ocean or absorb chemicals from the water, which weigh the particles down and cause them to sink to the bottom of the lakes.

«Most of what's known about the bottom of the ocean has come from images shot miles up in the water column, and it's a relatively coarse data set,» Cameron said recently at roundtable discussion in New York City with WHOI scientists who design, build and operate manned and robotic deep - sea exploration vehicles.

Researchers at the University of Southampton have captured unprecedented data about some of the coldest abyssal ocean waters on earth — known as Antarctic Bottom Water (AABW)-- during first voyage of the yellow robotic submersible known as Boaty McBoatface, which arrived back in the UK last week.

Taking turns with his shipmates, Wiens swung bright - yellow ocean bottom seismometers and hydrophones off the fantail, and lowered them gently to the water's surface, as the ship laid out a matrix of instruments for a seismic survey on the trench.

My research indicates that the Siberian peat moss, Arctic tundra, and methal hydrates (frozen methane at the bottom of the ocean) all have an excellent chance of melting and releasing their stored co2.Recent methane concentration figures also hit the news last week, and methane has increased after a long time being steady.The forests of north america are drying out and are very susceptible to massive insect infestations and wildfires, and the massive die offs - 25 % of total forests, have begun.And, the most recent stories on the Amazon forecast that with the change in rainfall patterns one third of the Amazon will dry and turn to grassland, thereby creating a domino cascade effect for the rest of the Amazon.With co2 levels risng faster now that the oceans have reached carrying capacity, the oceans having become also more acidic, and the looming threat of a North Atlanic current shutdown (note the recent terrible news on salinity upwelling levels off Greenland,) and the change in cold water upwellings, leading to far less biomass for the fish to feed upon, all lead to the conclusion we may not have to worry about NASA completing its inventory of near earth objects greater than 140 meters across by 2026 (Recent Benjamin Dean astronomy lecture here in San Francisco).

Scientists have discovered unusual hot water vents at the bottom of the Atlantic Ocean, such as this stone chimney rising three stories above the sea floor.

Presently, much of the Atlantic Ocean is well oxygenated (Figure 1) relative to the North Indian and Pacific Oceans, where bottom water O2 concentrations are lower because of the biological removal of O2 as thermohaline circulation moves deep waters across ocean basins from the North and South Atlantic towards the North Pacific, in isolation from the surface oOcean is well oxygenated (Figure 1) relative to the North Indian and Pacific Oceans, where bottom water O2 concentrations are lower because of the biological removal of O2 as thermohaline circulation moves deep waters across ocean basins from the North and South Atlantic towards the North Pacific, in isolation from the surface oocean basins from the North and South Atlantic towards the North Pacific, in isolation from the surface oceanocean.

Bathyal seafloor habitats in the North Pacific, North Atlantic, Arctic and Southern Oceans could experience a reduction in bottom - water oxygenation by 0.03 — 0.05 mL L — 1 by the year 2100 (Table 2; Figure 2), which represents a reduction in water column O2 levels by 0.7 % — 3.7 % (Table 3; Figure 3).

hydrothermal vent Openings at the bottom of the ocean or a lake where hot water emerges from deep inside the earth.

Similar effects are found in both the South Indian and South Pacific oceans, with the bottom waters being forced to follow the bottom topography.

«These mineral - water reactions are the restaurant at the bottom of the ocean of Enceladus, making goodies [i.e. molecular hydrogen (H2) and methane (CH4)-RSB- that primitive microbes could eat,» said Lunine.

Nakano, H., and N. Suginohara, 2002: Effects of bottom boundary layer parameterization on reproducing deep and bottom waters in a World Ocean model.

Scientists on NASA's Cassini mission conjecture that this is how water interacts with rock at the bottom of the ocean of Saturn's icy moon Enceladus, producing hydrogen gas (H2).

The researchers think these conditions may exist on the seafloor of Enceladus, where hot water from the interior meets the relatively cold water at the ocean bottom.