The time needed to destabilize large methane hydrate deposits
in deep sediments is likely millennia [215].
It may be a change activity in shallow water or surface sediment organisms producing more methane, rather than increased melting
in deep sediments — isotope ratios ought to help clarify that.
The time needed to destabilize large methane hydrate deposits
in deep sediments is likely millennia [215].
Parkes has found microbes
in deep sediments that grow best at precisely the pressure at which he found them.
Some bones
in deeper sediments, they said, probably belonged to wild camels that people hunted for their meat.
If you read the linked article (where it says «A scientific report» in this article), it states «Some bones
in deeper sediments, they said, probably belonged to wild camels that people hunted for their meat.»
The methane in gas hydrates must come either from methane - producing bacteria living in the permafrost, or from the breakdown of organic matter
in deeper sediments.
Not exact matches
Susan Lorenz studied soil,
sediment, ground and surface water samples, and said that although she found lead present
in surface soils, it had not migrated to
deeper soils or ground water.
The Inner Harbor is two - to - four feet
deep in many areas, thanks to
sediment from Onondaga Creek fed by the Tully mud boils, county officials said.
In some places, the carnivorous dinosaurs also left much deeper tracks in the sediment than elsewher
In some places, the carnivorous dinosaurs also left much
deeper tracks
in the sediment than elsewher
in the
sediment than elsewhere.
In particular, deep down, the researchers identified a layer of sediment where the water had a lower salinity than the water in the sediment above or belo
In particular,
deep down, the researchers identified a layer of
sediment where the water had a lower salinity than the water
in the sediment above or belo
in the
sediment above or below.
We see the
deep past here through narrow temporal and spatial windows — walk a mile
in any direction and you are either hundreds of thousands of years earlier or later because you are walking on eroding
sediments from different slices of time.»
Researchers have decoded the chemistry of the first of a wealth of unique compounds produced by a new genus of bacteria that dwells
in deep - ocean
sediments, and they have found it to be a potent inhibitor of human cancers
in lab experiments.
Other hostile conditions
deep in ocean
sediments, such as scarce nutrients, high pressure, or extreme salinity, probably set life's limit
in some places.
Oxygen from seawater permeated only the upper millimeter or so of
sediment, but the researchers noticed something happening much
deeper in the mud, more than a centimeter below, as if oxygen were available down there, as well.
When the researchers switched the electric current off by deoxygenating the water, thereby removing the electron acceptor at the
sediment surface, the depth of the hydrogen sulfide layer
in the
sediment rose
in less than an hour, as
deeper microbes could no longer consume it.
Bacteria sitting
in the top layer of
sediment receive electrons that they use to consume oxygen from oxygen - deprived but well - nourished bacteria
deep down, which consume hydrogen sulfide and carbon.
Permafrost was known to contain gas hydrates — icelike mixtures of water and organic gases first identified
in deep - sea
sediments which form only at very high pressures and low temperatures.
When the creatures that eat the plankton die, their shells and organic remains fall to the ocean floor, sequestering carbon
in the
deep water and
sediments.
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.
Core samples from
deeper in the Lake Towuti
sediment will show whether this drying evident during the last ice age also happened
in previous ice ages.
Small organisms (meiofauna) inhabiting
sediments in the
deepest (> 10,000 m) ocean trenches are almost unknown.
This fits with what the team see
in the rate of
sediment accumulation
in the
deep sea — large flood events transporting more
sediment, and moving it further.
In addition, the total amount of cesium retained more than 3 feet deep in the sands is higher than what is found in sediments on the seafloor offshore of the beache
In addition, the total amount of cesium retained more than 3 feet
deep in the sands is higher than what is found in sediments on the seafloor offshore of the beache
in the sands is higher than what is found
in sediments on the seafloor offshore of the beache
in sediments on the seafloor offshore of the beaches.
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.
They found several, including a 375 - kilometer - diameter eddy that crossed the study site from February to March 2005, just before the strong
deep currents and drop off
in sediments and larvae.
The crises faced by humanity today are important to us, but they will eventually prove no more significant than a thin bed of
sediment in the
deep stratigraphy of the universe.»
The surface usually conceals oil buried
deeper in the
sediment.
Gard found similar fossils
deeper down
in the
sediment cores, indicating that the Arctic ice partially cleared at various times from about 128 000 to 71 000 years ago — a period covering the latest interglacial and the early part of the latest ice age.
To untangle the impacts that these three climate stressors will have on seafloor diversity
in the future, the researchers examined existing published data and collected new data on organisms living
in deep - sea
sediments in upwelling regions along continental margins, where the ocean and continental crusts meet along the seafloor.
In the depths of the Arctic Ocean, buried deep in the sediment, an ancient creature waited for over a million years to be discovere
In the depths of the Arctic Ocean, buried
deep in the sediment, an ancient creature waited for over a million years to be discovere
in the
sediment, an ancient creature waited for over a million years to be discovered.
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.
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 activities.
Proponents say that diverted rivers, industrial mining, deforestation, extinctions, and urbanization, among other human - driven phenomena, have made
deep and permanent changes to the planet that will show up
in sediment millions of years from now.
Analysing new data from marine
sediment cores taken from the
deep South Atlantic, between the southern tip of South America and the southern tip of Africa, the researchers discovered that during the last ice age,
deep ocean currents
in the South Atlantic varied essentially
in unison with Greenland ice - core temperatures.
But «I was awestruck at the abundance and diversity of small animals of
deep sea
sediments,» Grassle recalled
in a greeting he recorded
in accepting one of two Japan Prizes announced today.
Czaja's fossils show the Neoarchean bacteria
in plentiful numbers while living
deep in the
sediment.
As evidence, he pointed to large,
deep pits at the base of the former ridge — «plunge pools» that were formed by the force of the waterfalls and later filled
in with
sediment.
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.
18Oc measured
in foraminifera collected from
deep sea
sediment cores (Lisiecki et al., 2005).
The bacteria living
in these
sediments were respiring the oxygen but at a slower rate than the supply of organic material dropping out of the water column, allowing these ancient
deep marine
sediments to remain oxygenated.
A University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science - led research team analyzed the
sediments of mesophotic coral reefs,
deep reef communities living 30 - 150 meters below sea level, to understand how habitat diversity at these
deeper depths may be recorded
in the sedimentary record.
Not only is there a much higher diversity of microbes under the seafloor than originally thought, large and active populations exist much
deeper in the
sediments than was believed, the team reports 21 July
in Nature.
Thus aerobic metabolism can persist
in deep marine
sediments.
An analysis of
sediment from 17 seabed sites — from European estuaries to the Great Barrier Reef
in Australia and the
deep Atlantic Ocean — found that the bathyal region of the Rockall Trough has more species than any other area so far measured.
This picture may be about to change
in light of a study of
deep - sea rocks and
sediments led by John Parkes, a microbiologist at Cardiff University
in the U.K.. By visiting oil - drilling projects at two sites
in the Pacific
in 2002, Parkes and colleagues obtained samples as
deep as 400 meters beneath the seafloor.
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.
Researchers reconstructed Arctic circulation through
deep time by measuring radioactive trace elements buried
in sediments on the Arctic seafloor.
This study therefore shows that climate warming is not the only explanation of global ecological disasters
in the past on Earth: it is important to continue analysing ancient marine
sediments to gain a
deeper understanding of the earth's climate system.
In the Mississippi River system, however, a series of dams on various upstream tributaries have reduced sediment supply to the delta, while levees on the lower part of the river have artificially channelized the flow, forcing sediments to be deposited beyond the delta in the deeper Gulf of Mexic
In the Mississippi River system, however, a series of dams on various upstream tributaries have reduced
sediment supply to the delta, while levees on the lower part of the river have artificially channelized the flow, forcing
sediments to be deposited beyond the delta
in the deeper Gulf of Mexic
in the
deeper Gulf of Mexico.