Sentences with phrase «sea sediments»
Sea sediments are the particles and debris that settle at the bottom of the ocean over time. They can include sand, mud, rocks, and dead organisms. Full definition
18Oc measured in foraminifera collected from deep sea sediment cores (Lisiecki et al., 2005).
sciencedaily.com
But the latest research into sulphur - producing algae, ancient ice cores, and sea sediments from the North Atlantic region could help climatologists
In previous studies, the scientists had found evidence of eight massive melting events in deep sea sediments around the Antarctic, which occurred at the transition from the last ice age to the present warm period.
Preliminary results of microfossil analyses of Amundsen Sea sediment cores.
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.
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.
In fact, independent evidence, from ice cores and sea sediments for instance, suggest the last time the planet approached this degree of warmth was during the interglacial period preceding the last ice age over 100,000 years ago.
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 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.
New material had buried the older layers, cutting off their oxygen, and more recent Black Sea sediments weren't exposed to oxygen at all.
Deep - sea sediments yielded both antique DNA and fossils (above) from minute sea creatures.
Use of bromodeoxyuridine immunocapture to identify psychrotolerant phenanthrene - degrading bacteria in phenanthrene - enriched polluted Baltic Sea sediments.
New Insights on Last Glacial Ice - sheet Dynamics and Retreat Deduced from Southeastern Weddell Sea Sediment Daniela Sprenk, Michael E. Weber, Gerhard Kuhn
Thousands of years ago, sea sediments made by different chemical compounds formed these striped patterns across the land.
Major reorganization resulted in southern hemisphere deep - sea sediment distribution patterns.
Such cycles obey very precise mathematical relations, and we can see these signals in ice core and deep sea sediment records.
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.
It revealed that around four billion microscopic plastic fibres could be littering each square kilometre of deep - sea sediment around the world.
Microfossil distributions in modern Amundsen Sea sediments.
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.
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).
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.
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.
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.
A 2014 study involving Museum researcher Dr Lucy Woodall found high levels of contamination in deep - sea sediments.
However, foraminifera data are limited and difficult to obtain by deep - sea sediment coring, and the shells are not perfect proxies for ocean conditions.
«But if you think about deep sea sediments, the water column over them is on the order of one, two, even five kilometers, and a lot of ocean bottom water is 2 °C, not much different from the 0 °C under the West Antarctic ice sheet.
This paved the way for determining the age of very small organic materials, including samples from deep - sea sediment cores, which eventually led to the validation of the Milankovitch theory of ice ages.
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: