Sentences with phrase «amundsen sea sediments»

This age was based on isotopic dating of 5 meteorites and a representative sample of modern Earth lead from a Pacific deep - sea sediment, all of which plot along a linear isochron on a graph of 207Pb / 204Pb versus 206Pb / 204Pb (Patterson, 1956).

But to study Earth's history over tens to hundreds of millions of years, researchers examine the chemical and biological signatures of deep sea sediment archives.

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.

The data come from deep - sea sediment cores dating to 205 million years ago that contain inorganic carbon - rich minerals as well as the organic remains of single celled marine phytoplankton.

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.

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.

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.

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.

But the latest research into sulphur - producing algae, ancient ice cores, and sea sediments from the North Atlantic region could help climatologists

Most of the rest was incorporated into the deep - sea sediments, where it could be recycled by animals and microbes that feed on the mud.

New material had buried the older layers, cutting off their oxygen, and more recent Black Sea sediments weren't exposed to oxygen at all.

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.

18Oc measured in foraminifera collected from deep sea sediment cores (Lisiecki et al., 2005).

Bacteria, however, have remained Earth's most successful form of life — found miles deep below as well as within and on surface rock, within and beneath the oceans and polar ice, floating in the air, and within as well as on Homo sapiens sapiens; and some Arctic thermophiles apparently even have life - cycle hibernation periods of up to a 100 million years while waiting for warmer conditions underneath increasing layers of sea sediments (Lewis Dartnell, New Scientist, September 20, 2010; and Hubert et al, 2010).

«We have recovered two new high - resolution paleomagnetic records of the Laschamp Excursion (~ 41,000 calendar years B.P.) from deep - sea sediments of the western North Atlantic Ocean.

A 2014 study involving Museum researcher Dr Lucy Woodall found high levels of contamination in deep - sea sediments.

Microfossil distributions in modern Amundsen Sea sediments.

Preliminary results of microfossil analyses of Amundsen Sea sediment cores.

However, foraminifera data are limited and difficult to obtain by deep - sea sediment coring, and the shells are not perfect proxies for ocean conditions.

Evidence from carbon isotope records from both soil carbonates [18]--[20] and biomarkers (n - alkanes) extracted from deep - sea sediments [21] provide clear evidence of a progressive vegetation shift from C3 (∼ trees and shrubs) to C4 (∼ tropical grasses) plants during the Plio - Pleistocene.

Thousands of years ago, sea sediments made by different chemical compounds formed these striped patterns across the land.

For Fred Singer, a climatologist at the University of Virginia and another co-author, the current warming «trend is simply part of a natural cycle of climate warming and cooling that has been seen in ice cores, deep sea sediments and stalagmites... and published in hundreds of papers in peer reviewed journals.»

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.»

In my briefings to the Association of Small Island States in Bali, the 41 Island Nations of the Caribbean, Pacific, and Indian Ocean (and later circulated to all member states), I pointed out that IPCC had seriously and systematically UNDERESTIMATED the extent of climate change, showing that the sensitivity of temperature and sea level to CO2 clearly shown by the past climate record in coral reefs, ice cores, and deep sea sediments is orders of magnitude higher than IPCC's models.

Here is fresh evidence from some Los Angeles back yards and the «deadest» depths of deep - sea sediments:

It is far more important to see whether there is a consistency between corals and deep sea sediment and ice cores and models than it is to validate someones spread sheet.

(Solar - cycle variation of nitrates also suggests that we do not require global - scale variation of temperature to explain some geological evidence of past solar cycles in lake sediments or shallow sea sediments.

What is true is that there is very very strong evidence from paleoclimate data (deep sea sediment cores) for changes in the distribution of chemical tracers that must reflect changes in the deep circulation in the Atlantic.

«The primary sources of calcium carbonate for deep sea sediments are pelagic calcitic coccolithophores and foraminifera that grow dominantly in the phototic zone (typically upper 100 m) and to a lesser extent aragonitic pteropods.

As with dust found in sea sediments, dust in ice can be analyzed chemically to find out where it came from.

Chemical contaminants such as persistent organic pollutants, toxic metals (e.g., Hg, Cd, Pb, Ni), radioactive compounds, pesticides, herbicides, and pharmaceuticals are also accumulating in deep - sea sediments [252].

Cores extracted from deep - sea sediment deposits contain evidence of earlier cold periods.

There are some detailed pages of information that have been meticulously reconstructed after having passed through the cross-cut shredder of geological history: the information from ice cores and the deep sea sediment cores are obvious examples.

... The evidence comes from a close correlation between inferred changes in production rates of the cosmogenic nuclides carbon - 14 and beryllium - 10 and centennial to millennial time scale changes in proxies of drift ice measured in deep - sea sediment cores.

Evidence from ice cores and deep - sea sediment has shown that the Northern climate also cooled before the Southern climate during these abrupt changes, creating a «bipolar seesaw,» with the North cool while the South was warm, and the South cooling as the North warmed.

Describe how ocean acidification may impact the ability of oceans to store carbon in deep sea sediments.

Thirty years ago when much of the research involved deep - sea sediment cores (fossils and chemistry) with millennial - scale intervals, there wasn't much data available to calculate meaningful confidence intervals.

Union of Concerned Scientists: Human Fingerprints Science Daily: Deep - sea Sediments Could Safely Store Man - made Carbon Dioxide Discovery Channel: Global Warming

Broecker later remarked that the relatively smooth temperature record of oxygen isotopes in deep - sea sediments «tended to lull scientists into concluding that the Earth's climate responds gradually when pushed.»

Using evidence garnered from samples of glacial cores and deep sea sediment, paleoclimatologists can find patterns in the natural changes of the past and use them to predict future changes.

Earlier research, based on deep sea sediments deposited between the last Ice Age and the present warm period, has found evidence of eight melting events in the region, the largest occurring 14,700 years ago.

Beyond that are various isotopes isolated from ostracods etc. in deep sea sediment cores.

A clear drop in the carbonate content of deep - sea sediments directly points towards ocean acidification as a side effect, a perturbation to the carbon cycle that lasted about 170,000 years.

Sea level from equations (3.3) and (3.4) is shown by the blue curves in figure 2, including comparison (figure 2c) with the Late Pleistocene sea - level record of Rohling et al. [47], which is based on analysis of Red Sea sediments, and comparison (figure 2b) with the sea - level chronology of de Boer et al. [46], which is based on ice sheet modelling with the δ18O data of Zachos et al. [4] as a principal input driving the ice sheet model.

Milankovitch's theory was largely ignored until, in 1976, a study based on deep - sea sediment cores in Antarctica substantiated that changes in temperature going back 450,000 years largely conformed to changes in the Earth's orbit.

There is a diffrence of permafrost and sea sediment methane — why not make the diffrence?

Coupled with paleontological analyses of marine microfossils in deep - sea sediments, these stable - isotope and trace - element microanalyses provide quantitative measures of global climate and ocean behavior over diverse time scales.

Abrupt change comes — «if», from sea sediments, irreversible thaw from the peat bog.

«We have recovered two new high - resolution paleomagnetic records of the Laschamp Excursion (~ 41,000 calendar years B.P.) from deep - sea sediments of the western North Atlantic Ocean.

The real problem is the volcanic data and sea sediment data (proxy data that is used to determine the intensity of the geomagnetic field) indicates that climate changes directly affects the intensity of geomagnetic field.