Sentences with phrase «record of sediment»

As part of the Dead Sea Deep Drill Core Project, Goldstein and other colleagues drilled deep below the lakebed of the Dead Sea in 2010 and 2011 to pull up more than 1,300 feet (400 meters) of sediment in a long column — a record of sediment deposits spanning 200,000 years.

A new record of sediment deposits from Cape Cod, Mass., show evidence that 23 severe hurricanes hit New England between the years 250 and 1150, the equivalent of a severe storm about once every 40 years on average.

Not exact matches

Please note, however, that there are ongoing PCB releases from several contaminated sediment sites in the Lower Hudson River for which the NYSDEC has the lead responsibility (for example, the Harbor at Hastings site for which NYSDEC issued a record of decision in 2012),» she wrote.

Munoz and his colleagues studied tree rings and sediments from oxbow lakes to create their 500 - year record of Mississippi River floods.

Rocks and sediments that have recorded conditions millions of years ago could be the key to predicting the future of climate change, according to a new National Academy of Sciences report

Carmala Garzione, a professor of earth and environmental sciences at the University of Rochester, and Junsheng Nie, a visiting research associate at the University, surveyed sediment samples from the northern Tibetan Plateau's Qaidam Basin and were able to construct paleoclimate cycle records from the late Miocene epoch of Earth's history, which lasted from approximately 11 to 5.3 million years ago.

These sediments hold historic records of climate change and monsoon activity during the last 15 million years.

«This decline is seen in the sediment core records and is a major problem for the conservation of Lake Tanganyika's many threatened species and unique ecosystems.»

During Expedition 359, Eberli's team drilled seven holes along the Maldives Archipelago to collect sediments that hold records of past sea level and environmental changes during the Neogene, a geological time period that began 23 million years ago.

These samples augment other marine records such as coral and seashells, which provide detailed records over a short time period, and deep - ocean sediments, which preserve thousands of years of history but are harder to date precisely.

Because of unprecedented hurricane - related rainfall in southeastern Texas last week, the Gulf of Mexico and its bountiful offshore ecosystems are contending with the record - setting pulse of freshwater — a volume of water exceeding the entire Chesapeake Bay — that surged off the land, sweeping along sediment, nutrients, and pollutants.

Uniquely spherical magnetic minerals wafted over the world by coal burning can be found from peat bogs to lake sediments and may furnish a record of this carbon combustion for future geologists.

The team's research, supported by the National Science Foundation and a NASA graduate fellowship, began with a study of coastal lake sediments in Japan to establish long - term records of tsunami flooding.

Previous ocean sediment records suggest that, as the world slipped into the last glacial period, less carbon overall reached the sediments of the Southern Ocean, coinciding with declining atmospheric carbon dioxide.

The highly detailed record of the past 20,000 years comes from analyses of fossilised tree pollen from lake and peat sediments.

Ocean sediment records, which contain evidence of carbon and nutrients, are one way to reconstruct that history.

Their new method allows them to extract rates of change from a sediment record without the need for an actual sediment age model.

That could explain two other anomalies from the era's geologic record, Lenton says: the large amounts of organic - rich shale that were deposited as nearshore sediments and the unusually high proportion of carbon - 13 isotopes in the rocks.

Word that a lake sat close to ground zero piqued our interest in mounting a field trip there because lake - bottom sediments can store a detailed record of events that occurred in the surrounding region, the basis of paleolimnological studies.

The preserved layers in the core revealed that the site held a sediment record stretching back at least 14,000 years — and the spot, Lake Hill, was only a quarter of a mile away from the cave where Graham had made his discovery.

Eelco Rohling of the University of Southampton in the UK and colleagues already had a record of the Red Sea's level going back 150,000 years, based on sediment cores.

To further refine the probability estimates, they took into account past (prior to recorded history) tsunamis — evidence of which is preserved in geological layers in coastal sediments, volcanic tephras, and archeological sites.

Most of our sea - level records are based on the chemical make - up of sediment cores, which are hard to date — estimates can be thousands of years out.

Scientists» understanding of the climate during the Pliocene has largely been pieced together from fossil records preserved in sediments deposited beneath lakes and on the ocean floor.

Using sediments from a remote lake, researchers from Brown University have assembled a 60,000 - year record of rainfall in central Indonesia.

It's estimated that Lake Tuwuti sediments record up to 800,000 years of climate data, and Russell recently received funding to take deeper cores.

Peter Huybers and Carl Wunsch compared the timing of the last seven thaws, as determined from sediment records, with previously calculated changes in Earth's orbit.

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.

By looking at how concentrations of chemical elements in the sediment change with depth, the researchers can develop a continuous record of how much surface runoff poured into the lake.

IODP is a collaboration of scientists from 23 countries; the organization coordinates voyages to study the history of the Earth recorded in sediments and rocks beneath the seafloor.

An analysis of sediments deposited over the past 4600 years provides a record of the vegetation and soil nutrient patterns and shifts in hydrology, revealing some of the processes that have hitherto remained obscure.

The evidence is now clear that far below the sea, and far below the floor of the sea, in sediments all over the world, microbes live to astonishing depths — the record so far is half a mile — and in astonishing numbers.

The researchers compared the lead isotopes in their sediment samples with those found in preserved Roman piping to create a historical record of lead pollution flowing from the Roman capital.

«These results help resolve a divergence in climate trends of the past 2,000 years recorded in marine sediments of the North Atlantic Ocean, compared with those recorded in fossil pollen from the continents of North America and Europe,» says Jonathan Wynn, program director in NSF's Division of Earth Sciences, which co-funded a portion of the research with NSF's Division of Environmental Biology.

And in the lake bed sediments, the team will search for records of the poorly understood history of the West Antarctic Ice Sheet, potentially revealing how the mighty glacier has waxed and waned over time.

The team used precisely dated cave records and marine sediments from the Mediterranean region to reconstruct the sequence through time of changes in all critical climate parameters.

The target in Gale would be its 5 - kilometer - high pile of sediments — or rather the bottom layers, laden with both clays and sulfates that may record the loss of an early, life - friendly environment on Mars.

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.

In 1991, the IMO adopted guidelines which recommend that ships should avoid taking on ballast in shallow areas and during toxic blooms of marine algae; keep accurate records of where and when ballast is loaded; exchange ballast water at sea, where toxic organisms are rare; and discharge sediments into approved areas at the port of destination («End of the line for deadly stowaways», New Scientist, 24 October 1992).

Look at these distances: It requires almost a thousand kilometers of seafloor spreading to record the same amount of time that you find in 150 meters of mountain sediment, so the earth is running two magnetic tape recorders.

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).

The team found layers of sediment and rocks that built up over time, recording the flow of the ice sheet and reflecting climate change.

Looking forward, the researchers are now hoping to examine other Ediacaran sediments from around the globe to verify the rapid reversals» signal, along with hunting for biological or chemical evidence for high doses of UV radiation in the fossil record.

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.

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.

The keys to understanding future climate change may be locked in rocks and sediments that act as records of conditions millions or billions of years ago, the National Academy of Sciences said yesterday.

Climate records derived from the analysis of sediments show that ice shelves off the peninsula have been absent in several earlier eras, when natural variability warmed the world.

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.

The maar lake Aljojuca, 20 miles south of Cantona, yielded sediments that recorded a lengthy series of droughts between A.D. 500 and 1150 that likely led to the abandonment of Cantona in A.D. 1050.

The paleoclimate data, which included mainly changes in the oxygen isotopes of the calcium carbonate deposits, were then compared to similar records from other caves, ice cores, and sediment records as well as model predictions for water availability in the Middle East and west central Asia today and into the future.