Sentences with phrase «from sea floor sediments»

Scientists devised ingenious techniques to recover evidence from the distant past, first from deposits left on land, then also from sea floor sediments, and then still better by drilling deep into ice.

>... there are still ways of discovering the temperatures of past centuries,... tree rings... Core samples from drilling in ice fields... historical reconstruction... coral growth, isotope data from sea floor sediment, and insects, all of which point to a very warm climate in medieval times.

Not exact matches

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.

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.

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.

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.

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.

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.

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.

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.

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

The most likely explanation is the mass release of methane from sediments on the sea floor, where the gas was sequestered, as it is now, in a solid form as methane hydrate.

The gray whale is unique in the use of its baleen feeding technique as contrasted to other baleen whales.According to the National Marine Mammal Laboratory, «Gray whales are bottom feeders, and suck sediment and the «benthic» amphipods that are their prey from the sea floor.

So if you want to check whether erosion and sediment transport were taking place during the Pliocene, the best bet is to sample the sediments on the sea - floor dating from that time, by drilling through them and taking cores.

In a core of sediments taken from the sea floor that was once covered by the Larsen A Ice Shelf, researchers led by Dr. Eugene W. Domack, a professor of geology at Hamilton College in Clinton, N.Y., found the tiny fossils of marine algae.

They live only in a few borderline places, however; for global temperatures scientists use not only other species of trees but a wide variety of «proxies» from ice cores, coral reefs, cave deposits, the sea floor, pollen in lake sediments, boreholes in rock and so forth.

However, most of the methane produced from dissociating marine hydrates will be consumed by anaerobic processes in the top few metres of sulphate - rich near - sea - floor sediments and all of the rest will be dissolved and oxidized in sea water and will not be released to the atmosphere as methane, although the dissolved CO2 will equilibrate with atmosphere after a few centuries.

From their trawlers scraping the floors of the seas to their dams impounding sediment by the gigatonne, from their stripping of forests to their irrigation of farms, from their mile - deep mines to their melting of glaciers, humans were bringing about an age of planetary chaFrom their trawlers scraping the floors of the seas to their dams impounding sediment by the gigatonne, from their stripping of forests to their irrigation of farms, from their mile - deep mines to their melting of glaciers, humans were bringing about an age of planetary chafrom their stripping of forests to their irrigation of farms, from their mile - deep mines to their melting of glaciers, humans were bringing about an age of planetary chafrom their mile - deep mines to their melting of glaciers, humans were bringing about an age of planetary change.

Proxy data such as those generated from ice core samples, measurements of tree rings intervals, bore samples taken from sediments from the ocean and sea floor, and measurement of gases from bubbles trapped in ice are some examples of preserved physical characteristics of the past used by scientists to reconstruct prevailing climatic conditions in the past.

Much of the color likely comes from resuspended sediment dredged up from the sea floor in shallow waters.

To measure how the system has shifted over long timescales, researchers collected long cores of sediment from the sea floor.

Episodic and explosive escapes of gaseous methane from the sediment column have been documented by kilometer - scale «wipeout zones» in seismic images (Riedel et al., 2002), and pockmarks on the sea floor, called eruption craters (Hill et al., 2004).

According to the invention, sediments including clathrate - rich material disturbed from the sea floor are carried upward, with the aid of injection gas.

In the 1970s, the first comprehensive analysis of oxygen isotopes in sediments from cores taken from the sea floor established for the first time that the timing of the Ice Ages was linked to subtle changes in the Earth's orbit around the Sun as suggested long ago by Serbian mathematician Milutin Milankovitch.