Sentences with phrase «of sediment cores»

However, studies of sediment cores have shown that natural dust deposition has been in decline.

The scientists were especially interested in the younger, upper part of the sediment core, which covers the last 7000 years.

Based on a multi-proxy analysis of sediment cores retrieved from the tidal flat zone around Hallig Südfall and from the Hallig itself, we identified a late medieval paleosol associated with the formerly cultivated marshland most probably belonging to the Edomsharde and local trade centre of Rungholt.

Might be some proxy for total primary productivity, or biomass, or respiration, or photosynthesis, or chemistry of diatom shells or lack thereof in each slice of the sediment core.

For this reason, the PETM, which has been identified in hundreds of sediment core samples worldwide, is probably the best ancient climate analogue for present - day Earth,» the release noted.

The analysis of sediment cores provides direct physical evidence of the environmental conditions that sparked the monsoon conditions that exist today around the low - lying island nation and the Indian subcontinent.

The scientific team on International Ocean Discovery Program (IODP) Expedition 359, which included UM geochemist Peter Swart and sedimentologist Anna Ling, extracted 3,097 meters of sediment cores that contain the history of the monsoon that is the most intense annually recurring climatic element on Earth.

«In the very top of these sediment cores we take, we get these fly ash indicators,» explains Leeds geologist Graeme Swindles, lead author of a paper published in Scientific Reports on May 28 (Scientific American and Scientific Reports are part of Nature Publishing Group.)

Analyses of sediment cores show that Arctic summers 3.6 million years ago were a good 8 degrees Celsius warmer than they are today, and supported Douglas fir and hemlock.

The researchers have pieced together how rainfall patterns varied in southern Africa over the last 100,000 years, by analysing river delta deposits at the edge of the continent, where every millimetre of sediment core corresponds to 25 years of sedimentation.

Studies of the sediment cores obtained during the expedition will focus on understanding how Earth's tectonic plates move and how the global climate system works.

A series of sediment cores drilled from New York marshes confirm that mega droughts can grip the region: One spanned from 850 to 1350 A.D., Peteet said.

Researchers at the Alfred Wegener Institute have now more closely analysed the glacial history of the central Arctic with the help of sediment core data and climate simulations.

The team also compared its information to prior studies of sediment cores extracted from an oceanic region in the central Arctic Ocean called the Lomonosov Ridge — a steep hump of continental crust that rises more than 1,000 feet from the ocean floor — to estimate past environmental conditions in the Arctic Ocean.

Further tasks include the construction of the chronostratigraphy of the sediment cores and the creation of further sedimentological and geochemical datasets.

Diatom biostratigraphy of sediment cores from beneath the Ross Ice Shelf.

R. J., 1980, Radio active dating of sediment cores from four contiguous lakes in.

Through a combination of sediment cores analyses and ice - sheet modelling, the study shows that this area has probably been steadily leaking methane from hydrates for 8000 years.

Thus the effect of sediment cores, which show strong local effects (e.g. in upwelling regions) is minimized, and the mean SST anomaly should be more representative for large scale tropical conditions (dominated by large scale forcings, such as lowered CO2 concentrations).

Warm - weather crop farms, such as orange farms, in China were abandoned altogether and physical evidence of sediment cores and stalagmite growth suggest Africa was feeling the dip in temperatures during this time as well.

Analysis of sediment cores led to the conclusion «that at least seven hurricanes of intensity sufficient to produce storm surge capable of overtopping the barrier beach (> 3 m) at Succotash Marsh have made landfall in southern New England in the past 700 yr.»

In geologic studies it is quite common that the youngest surface of a sediment core is not dated by radiocarbon, either because the top is disturbed by living organisms or during the coring process.

By counting the number of scales left behind at various levels of the sediment cores, the researchers determined how much sunlight reached the bottom of the pond in a given year, allowing them to estimate the pond's water depth, clarity and chemistry over time.

Might be some proxy for total primary productivity, or biomass, or respiration, or photosynthesis, or chemistry of diatom shells or lack thereof in each slice of the sediment core.

They collected 2,500 meters (8,202 feet) of sediment cores from layers that record how the geography, volcanism and climate of Zealandia have changed over the last 70 million years.