Sentences with phrase «sea sediments from»

But the latest research into sulphur - producing algae, ancient ice cores, and sea sediments from the North Atlantic region could help climatologists

Not exact matches

Inadequate flood protection infrastructure, which right now might not contain high tides in El Nino years; Lack of action on annual sediment removal from spring freshets, which each year move over 30 million m3 of sediment and leave about 3 million m3 of silt in the navigation and secondary channels of the lower reaches; and, By the end of this century sea levels at the mouth of the river could potentially rise more than one meter due to climate change overtopping the diking system.

Sediment resources on the OCS are leased to local communities or federal agencies to help them restore shorelines or wetlands in an effort to address chronic erosion, sea level rise, impacts from major storms, or to protect valuable infrastructure and habitat.

This age was based on isotopic dating of 5 meteorites and a representative sample of modern Earth lead from a Pacific deep - sea sediment, all of which plot along a linear isochron on a graph of 207Pb / 204Pb versus 206Pb / 204Pb (Patterson, 1956).

Using the Great Barrier Reef as their study case, they estimated the evolution of the region over the last 14,000 years and showed that (1) high sediment loads from catchments erosion prevented coral growth during the early phase of sea level rise and favoured deep offshore sediment deposition; (2) how the fine balance between climate, sea level, and margin physiography enabled coral reefs to thrive under limited shelf sedimentation rates at 6,000 years before present; and, (3) how over the last 3,000 years, the decrease of accommodation space led to the lateral extension of coral reefs consistent with available observational data.

By validating model results against geological observations, the study indicates that changes in runoff, sea level and wave energy have profoundly affected the past evolution of the Great Barrier Reef not only in regard to reefs evolution but also sediment fate from source - to - sink.

Confirmation arrived in February this year, when an international team extracted 34 sediment cores from three sites on the seabed, revealing a fossilised coral reef that reaches 110 metres into the sea floor.

The team investigated sediment cores collected from Pine Island Bay in the Amundsen Sea from the German research vessel RV Polarstern on two expeditions in 2006 and 2010.

Two meters (six and a half feet) below the surface he encountered a layer of sediment marked by coral fragments, mollusk shells and coarse beach sand that could only have come from the sea.

They note that it is completely buried by sediments from more recent eras, which indicates it was formed long before its surroundings, and that it has no topographic expression on the present sea floor.

Across the species» range from Baja California, Mexico, to Alaska, bioerosion on urchin - covered sandstone reefs, the researchers report, produces sediment approximately equivalent to that delivered to the coast by a river — some 200 tons of sediment per hectare — suggesting that when you stroll along the beach, a not insignificant chunk of the sand is, in fact, sea urchin waste.

«We know the sediments are of deep sea and terrestrial origin, including those eroded from the high Himalayas and transported thousands of kilometres into the Bay of Bengal and eastern Indian Ocean.

In a million years, barring profound shifts, the climate should have returned to its natural rhythms but any cities buried in sediment by rising seas should still be preserved, along with those signs of anthroturbation, human - induced disturbances underground, like the plutons from underground explosions of nuclear bombs.

David Anderson of the University of Colorado at Boulder and his colleagues extracted cores of this fossil - filled sediment from the floor of the Arabian Sea to reconstruct monsoon intensity over the past 1,000 years.

From the geochemical analyses carried out on the sediments deposited during the past 10,000 years in the Laguna de Rio Seco lagoon, a remote alpine lake in Sierra Nevada, at 3,020 m. above sea level, evidence has been found of atmospheric pollution from lFrom the geochemical analyses carried out on the sediments deposited during the past 10,000 years in the Laguna de Rio Seco lagoon, a remote alpine lake in Sierra Nevada, at 3,020 m. above sea level, evidence has been found of atmospheric pollution from lfrom lead.

Real - world data back the claim: Accumulations of calcium carbonate in deep - sea Pacific sediments show that the Pliocene ocean experienced huge shifts at the time, with waters churning all the way from the surface down to about three kilometers deep, as would be expected from a conveyor belt — type circulation.

The data come from deep - sea sediment cores dating to 205 million years ago that contain inorganic carbon - rich minerals as well as the organic remains of single celled marine phytoplankton.

Microorganisms living in basaltic sea floor buried beneath sediments derive energy from inorganic components from the host rocks that interact with infiltrating seawater, which brings dissolved oxygen and other trace nutrients with it.

Globally, salt marshes are being lost to waves, changes in land use, higher sea levels, loss of sediment from upstream dams and other factors.

Each of the river's identities — as the fertile nurturer and the wanton killer — derives from the same feature: the 1 billion tons of sediment that washes down each year from the Loess Plateau to the Bohai Sea.

Over a five - month period from December 2004 to April 2005, the traps collected samples of sediments and larva while the meters recorded deep - sea current velocities.

Other papers in the issue examine how deep sea sediments may affect seismic wave readings, and evaluate how the Cascadia Initiative's data collection from ocean bottom seismometers has improved over the first three years of the study.

In extreme rain events, sediment and associated pollution have already been shown to flow out to sea in a pulse reaching as far out as 100 kilometers (62 miles) that can be seen from space, said Richmond.

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.

Paleontologists must instead assemble timelines from fragments, such as sediment layers from short - lived inland seas.

Fumio Inagaki from the Japan Agency for Marine - Earth Science and Technology, who made the discovery, says the lake probably formed when carbon dioxide seeped out through the ocean floor from a deep - sea volcano and pooled under a blanket of solid, icelike CO2 hydrate and deep - sea sediment.

Records of sea surface temperature from oceanic sediment cores, for example, show that the magnitude of warming following several previous glaciations are well - correlated (www.ncdc.noaa.gov/paleo/recons.html).

While this research was done with sediments from South China, the sea levels during the Early Triassic behaved globally.

Lutz and Falkowski cite one study where unique chemical compounds isolated from an actinomycete strain inhabiting deep - sea sediments about 3.3 kilometers down in the South China Sea have shown potent activities against three cancerous tumor cell lines and also showed antibacterial activitisea sediments about 3.3 kilometers down in the South China Sea have shown potent activities against three cancerous tumor cell lines and also showed antibacterial activitiSea have shown potent activities against three cancerous tumor cell lines and also showed antibacterial activities.

The slimy mats acted as a barrier between the water above and the sediments below, preventing oxygen from reaching under the sea floor and making it largely uninhabitable.

Radioactive materials released into the Irish Sea from the Sellafield reprocessing plant over the past 40 years may eventually accumulate in thick sandy sediments midway between Ireland and the Isle of Man, according to the British government's Directorate of Fisheries Research.

A sediment sample from a knoll at a depth of 1170 metres identified a remarkable cold - water coral community of both living and fossil cold - water coral species, gorgonian sea whips, bamboo corals, molluscs and stalked barnacles.

Warming and the seas — both on the rise Those ancient samples of sediment from 10 coastal wetlands in North Carolina provide some of the best evidence that sea - level rise closely follows warmer temperatures, Rahmstorf says.

The team also found DNA from a form of marine alga in 9300 - year - old sediments, though the alga doesn't show up in the fossil record until 2500 years ago, says molecular paleoecologist Marco Coolen of the Woods Hole Oceanographic Institution in Massachusetts and an author of the Black Sea paper.

The researchers, which include U.S. teams from NOAA, the U.S. Geological Survey (USGS), and the University of New Hampshire, will be collecting seismic data from this region by bouncing sound blasts off the sea floor to determine its sediment makeup, as well conducting a multibeam analysis that will give them an idea of the shape of the ridge.

Martinez - Boti and his colleagues dug out sediments from the Caribbean Sea and tropical Atlantic Ocean.

Coolen's finding of marine species invading the Black Sea earlier than had been thought «is not something you could see from looking at fossils or sediment properties,» Kucera says.

They found that the embankments that protect the land from the river and sea had also robbed it of fresh supplies of sediment: during the five decades of its existence, the polder had sunk by a full meter relative to the land outside the embankments because it was not being replenished.

18Oc measured in foraminifera collected from deep sea sediment cores (Lisiecki et al., 2005).

Many others, he notes, suggest that samples are too easily contaminated during drilling by microbes that live in overlying sediments, or by inadequate precautions while handling the samples once they've been retrieved from the sea floor.

There, they collected mud from the sea floor, which builds up for millions of years like a giant layer cake as newer sediments pile on top of older ones.

Evidence for approximately contemporaneous global cooling in sediments that do contain YTT glass shards has been found in marine core oxygen isotope records from the South China Sea (3), as have terrestrial carbon isotope and pollen records from Northern India and Bengal (23).

By studying sediment cores from the deep Pacific near the Philippines, paleoclimatologist Lowell Stott of the University of Southern California in Los Angeles and his colleagues revealed that the temperatures of the deepest seas rose by around 2 degrees Celsius (3.6 degrees Fahrenheit) at least 1,000 years before sea - surface temperatures.

They analysed sediments from a shallow Atlantic Ocean shelf where sediment accumulates faster than it does in the deep sea, making it easier to see seasonal fluctuations in the amount deposited.

Heavy metals including cadmium and lead are unusually common in sediments from the South China Sea, hinting that run - off from farms was spilling into the ocean 4000 years ago

As the Earth continued to cool from Years 0.1 to 0.3 billion, a torrential rain fell that turned to steam upon hitting the still hot surface, then superheated water, and finally collected into hot or warm seas and oceans above and around cooling crustal rock leaving sediments.

«We have recovered two new high - resolution paleomagnetic records of the Laschamp Excursion (~ 41,000 calendar years B.P.) from deep - sea sediments of the western North Atlantic Ocean.

Jorgenson, M.T., and J. Brown, 2005: Classification of the Alaskan Beaufort Sea Coast and estimation of carbon and sediment inputs from coastal erosion.

See Page 4 - 22, Figure 9: Geomagnetic field intensity level derived from composite volcanic records, not sea floor sediments, for the past 45 kyr.

Those same sediments held another clue as well — the fossilized shells of plankton (small floating sea organisms) from the dinosaur days.