Sentences with phrase «ocean sediments»

But researchers comparing data collected from ocean sediment cores with climate simulations show that this event at most reached only about a tenth of today's carbon increase rate.

Let's say I have 100,000 organisms in a few grams of ocean sediment or soil.

I'm intrigued with some high - resolution ocean sediment studies.

Their findings, based on ocean sediment core samples between 2.5 million to 3.3 million years old, provide scientists with a deeper understanding of the mechanisms of climate change today.

The pulses of growth match cooling periods documented in ocean sediment cores and in the continuous cores from Iceland and Baffin Island, suggesting that glaciers have responded in sync across the North Atlantic for at least the past 4,000 years, the authors write.

Forests also enhanced silicate mineral weathering, further removing CO2 from the atmosphere via the deposition of carbonates in deep ocean sediments [Berner, 2003].

Independently, Greenland and Antarctic ice sheet volumes were estimated by observations from adjacent ocean sediment records and by ice sheet models.

«The data of the model simulation was so close to the deep ocean sediment data, that we knew immediately, we were on the right track,» said co-author Dr Laurie Menviel from the University of New South Wales, Australia, who conducted the model simulation.

Natural sources of methane include wetlands and methane hydrates (methane trapped in ice and buried deep under ocean sediments), whereas human sources range from fossil fuel emissions to the burning of crops and trees to the cow and sheep «emissions» that are a byproduct of large - scale livestock farming.

One of my long - standing interests is the location of ocean sediment series that enable apples - to - apples comparison of the 20th century to the mid-Holocene.

Trapped in ocean sediments near continents lie ancient reservoirs of methane called methane hydrates.

To test that idea, they have studied ancient ocean sediments laid down during the Ediacaran and Cambrian periods, which together ran from about 635 million to 485 million years ago.

Alongside tales of grim winters in Ithaca, New York, and spilling acid on himself, he covers argon's role in dating ocean sediments and the discovery that xenon is a splendid...

High - resolution ocean sediment cores can sometimes be found that fit this, as can some cave (speleothem) records and pollen records etc..

The researchers traced the Horn of Africa's climate 200,000 years into the past by analyzing a core of ocean sediment taken in the western end of the Gulf of Aden.

Worm greenhouse emissions (primarily methane) from our global ocean sediment buddies could lead to that proverbial tipping point - initiating a runaway global warming and catastrophic climate change scenario.

I recall also seeing work on ocean sediments indicating that during the dusty - dry climates when lots of windblown dust is in the air, plankton did not bloom in the oceans in proportion to the added minerals.

In Lab 6A, you learned that the ocean's biological pump sequesters large amounts of carbon dioxide in shell - building organisms that eventually die, sink and become part of deep ocean sediments for very long time scales - thousands to millions of years.

Sahara desert dust dominates modern - day ocean sediments off the African coast, and it can travel in the atmosphere all the way to North America.

«Examining the fate of Fukushima contaminants: Fraction of buried, ocean sediment uncovered by typhoons, carried offshore by currents.»

Sandy ocean sediment is associated with ice cover, and when you find it somewhere far from the ice edge, you know that at some point the ice reached that site.

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.

As scientists puzzle over how genes for antibiotic resistance arise in various environments and what risks to human health they might pose, one team has identified a surprising way some of these genes are getting into ocean sediments: through food for marine fisheries.

Bacteria in ocean sediments appear to string together nanowires to connect complementary but spatially separated chemical processes, according to a new study.

Hutton, an iconoclast stirred to scientific inquiry by the Scottish Enlightenment, argued instead that many of the rock formations he saw around him could not have formed from gently precipitating ocean sediment.

Work by Stephanie Wright from the University of Exeter found that if ocean sediments are heavily contaminated with microplastics, marine lugworms eat less and their energy levels suffer.

Worldwide, particularly in deeply buried permafrost and in high - latitude ocean sediments where pressures are high and temperatures are below freezing, icy deposits called hydrates hold immense amounts of methane (SN: 6/25/05, p. 410).

Ocean sediment reveals the pattern behind the rise and fall of ice ages and the shape of Earth's orbit.

The dates on two other ocean sediment cores (Stott et al 2004 — # 14 and # 15) are on the correct scale thankfully, but are still marginal in terms of resolution (29 and 44 years respectively, but effectively longer still due to bioturbation of the sediments).

Although seagrasses account for less than 0.2 % of the world's oceans, they sequester approximately 10 % of the carbon buried in ocean sediment annually (27.4 Tg of carbon per year) *.

[15] Through study of Pacific Ocean sediments, other researchers have shown that the transition from warm Eocene ocean temperatures to cool Oligocene ocean temperatures took only 300,000 years, [11] which strongly implies that feedbacks and factors other than the ACC were integral to the rapid cooling.

Proxy records (ice cores, ocean sediments etc.) that are related to climate (in some imperfectly known way, but with non-climatic «noise») go back further.

While the evidence for catastrophic leakage is still equivocal, the amounts of methane stored in permafrost and ocean sediments strongly argue for a precautionary approach to the risks of widespread release.

Palaeoclimatic studies make use of measurements of past change derived from borehole temperatures, ocean sediment pore - water change and glacier extent changes, as well as proxy measurements involving the changes in chemical, physical and biological parameters that reflect past changes in the environment where the proxy grew or existed.

Avery also disputes the scientific consensus on global warming, ascribing the warming to «sunspots,» purportedly based on information about ice cores and deep ocean sediment deposits.

This includes carbon on land in vegetation, soils, peat and freshwater and in the atmosphere, ocean and surface ocean sediments.

HS12 uses the oxygen isotope record in ocean sediments Zachos et al. (2008) to estimate past changes of sea level and ocean temperature, and thus obtain a largely empirical estimate of climate sensitivity.

Methane hydrates are 3D ice - lattice structures with natural gas locked inside, and are found both onshore and offshore — including under the Arctic permafrost and in ocean sediments along nearly every continental shelf in the world.

Citation: Shultz, D. (2015), Underwater robot tracked ocean sediment during Hurricane Sandy, Eos, 96, doi: 10.1029 / 2015EO032937.

Miles et al. report observations of ocean sediment movement off New Jersey's coast, caused by the storm.

After all, this man is presumably incapable of differentiating between ocean sediments and coral terrestrial deposits, nor can he go about analysing tree ring records and so on.