Sentences with phrase «sediment cores analyses»

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.

Not exact matches

The drill hole intersected a thick repetitive sequence of mafic and felsic sediments which showed no major structural deformation, a potential host for gold mineralisation, with geochemical analysis revealing alteration and mineralisation based on micro analysis of the cores by world class scientists from CODES in Tasmania.

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 sediment cores have been stacked in the science cooler, soon to be on their way to an analysis and storage facility in Florida.

Zeebe and co-authors Andy Ridgwell (University of Bristol / University of California) and James Zachos (University of California) combined analyses of chemical properties of PETM sediment cores with numerical simulations of Earth's climate and carbon cycle.

And in analyses of soil and lake sediment cores, researchers have found chemical and paleoecological clues indicating that Norse farmers skillfully maintained pastures with manure fertilizer and irrigation ditches.

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.

Using new chemical analyses of penguin guano extracted in sediment cores from a lake on the island, the researchers unraveled the history of the penguin colony.

Allaby's team took four core samples of sediments from a section of the site littered with burnt hazelnut shells apparently left by the hunter - gatherers and subjected the samples to both radiocarbon dating and ancient DNA analysis.

Preliminary results of microfossil analyses of Amundsen Sea sediment cores.

Through a painstaking analysis of sediment size and composition, pollen and plant material and even industrial contaminants, the research team was able to identify changes in sediment layers over time in the core.

Despite the difficulties, analyses of ice core and ocean sediment cores has shown periods of glacials and interglacials over the past few million years.

Suppl., HR: 1340h AN: OS53B - 1101 Holocene Paleoceanography of the Chukchi Sea / Alaskan Margin, Western Arctic Ocean «A multi-proxy approach to the analysis of deep - sea sediment cores has been used to investigate paleoceanographical changes in the western Arctic.»

The CO2 level comes from half a dozen different ice core analyses, while the temperature data come from marine sediments, pollen analyses, isotopes, corals etc..

The sediment coring and analysis by Donnelly and his colleagues «is really nice work because it gives us a much longer period perspective on hurricanes,» said Kerry Emanuel, a professor of atmospheric science at the Massachusetts Institute of Technology in Cambridge.

Of these proxies, some of the most useful for long - term climate analyses are ice cores, sediment cores, tree rings and, of course, the fossil record.

This «new evidence» is based on a single analysis of «proxy» data (that is, data that do not come from thermometers but rather from sources like tree rings, ice cores, corals, and ocean and lake sediments) showing the twentieth century to be the warmest in the past thousand years.

Measuring tree pollen or isotopes etc in sediment cores avoids these problems and it makes me wonder how come so much energy has been used for tree ring analyses.

However, both the driving force and the climate reconstructions over the pre-industrial era are based on the analysis of the natural archives of climate sensitive quantities, such as the growth of trees and seashells, and the changes of chemical, biological, and isotopic compositions in lake sediments and ice core samples.

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.

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.»

This record of past environments — assembled from an analysis of frozen core samples (defined) of Walden's sediments — was taken by Marjorie Winkler, a paleoecologist at the University of Wisconsin - Madison's Center for Climatic Research.

The earlier data comes from some sort of proxy analysis (ice cores, tree rings, sediments, etc.) While we know these proxies generally change with temperature, there are still a lot of questions as to their accuracy and, perhaps more importantly for us here, whether they vary linearly or have any sort of attenuation of the peaks.

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.