Sentences with phrase «oxygen isotopes»
Oxygen isotopes are different versions of the oxygen atoms found in molecules, like water or carbon dioxide. These versions have varying numbers of neutrons in their nuclei. The ratios of these isotopes can provide scientists with information about various processes, such as climate change or how water moves through the Earth's systems. Full definition
Nevertheless, some scientists claim that ratios of oxygen isotopes in marine fossils from the east coast of the US indicate that the Antarctic ice sheet melted at least partially during the Pliocene.
newscientist.com
The Earth's water must have come from its interior, according to a scientist who has studied the ratios of oxygen isotopes in rocks.
A study by Thomas, Dennis et al 2009 [8] derived a high resolution temperature proxy record from oxygen isotope ratios from the ice core.
The continental glaciations of the Pleistocene left signatures on the landscape in the form of glacial deposits and landforms; however, the best knowledge of the magnitude and timing of the various glacial and interglacial periods comes from oxygen isotope records in ocean sediments.
Cope IL, Wilkinson JJ, Boyce AJ, Herrington RJ (2010) Oxygen Isotope Composition of Hematite: Pic de Fon Deposit, Republic of Guinea, West Africa.
An ice drilling pioneer, Oeschger was now measuring oxygen isotopes in glacial - era lake deposits near his home in Bern, Switzerland.
In both cases the climate records are based on oxygen isotope measurements on datable layers of ice or stalagmite cave deposition.
The main panel 1 data is from stable oxygen isotope measurements from the shells of macroscopic marine organisms («fossil shells»), collected by Veizer et al (1999), as re-interpreted by Royer et al (2004).
Those that contain a high concentration of the heavier oxygen isotope O - 18, compared to the more common O - 16, crystallized in magma containing material that had interacted with liquid water.
By studying the relative amounts of different oxygen isotopes in the sediment core, the team could reconstruct rainfall dating back 3000 years.
By measuring the content of the special oxygen isotope O18 in the ice cores, you can get information about the temperature in the past climate, year by year.
1) Is anyone looking for unusual charcoal and pollen signals in the old world that might be proxies for slash and burn agriculture during oxygen isotope stage 5E?
Correlating cosmic ray fluxes to surface temperature Next, [Shaviv and Veizer, 2003] correlate a CRF reconstruction with a reconstruction of sea surface temperature based on oxygen isotope data from calcite shells from various low - latitude sites.
(I think some of Lonnie Thompson's work on interpreting low - latitude oxygen isotope values as temperature signals in ice cores led to some issues).
Mass - Independent Oxygen Isotope Fractionation in Atmospheric CO as a Result of the Reaction CO + OH
The team collected fossilized snails from the Isle of Wight, Great Britain, and looked for not just the kind and number of carbon and oxygen isotopes present, but how they were bound together.
So when water vapor that has cycled through the Martian atmosphere condenses into the Martian soil, it can interact with and exchange oxygen isotopes with zircons in the soil, effectively writing a climate record into the rocks.
Veizer, the geochemist, was studying oxygen isotope ratios in fossil crustaceans dating back more than 500 million years, a temperature proxy for equatorial oceans during the entire eon of visible life on earth.
When the jet stream got loopy In order to track the jet stream's behavior thousands of years ago, Bowen and his fellow researchers looked at oxygen isotope ratios from lake cores and cave formations in the eastern and western United States.
Zeebe, R.E., An explanation of the effect of seawater carbonate concentration on foraminiferal oxygen isotopes, Geochimica Cosmochimica Acta, 63, 2001 - 2007, 1999.
To better understand the cycle of magma production, the researchers analyzed oxygen isotope ratios in quartz and zircon, water - and heat - resistant minerals, from volcanic rocks in the Yellowstone caldera.
The new sea - level record was then used in combination with existing deep - sea oxygen isotope records from the open ocean, to work out deep - sea temperature changes.
The balance of oxygen isotopes within ozone are strikingly weird with enrichment of heavy isotopes through a physical chemical phenomenon first described by co-author Mark Thiemens, a professor of chemistry at UC San Diego, and colleagues 25 years ago.
However, he urges caution, because the team sampled only two trees, and because interpreting oxygen isotopes in the cellulose of tropical trees is still a relatively new field.
When glaciers melt, fresh water, enriched in light oxygen isotopes (oxygen 16), mixes with the bottom water.
So how has Monckton managed to take this straightforward data from Thompson et al (2003) whose conclusion concerning their «low latitude D18O history for the last millennium» is that in low latitudes (as judged by a composite ice core oxygen isotope enrichment analysis as a temperature proxy), the temperature has followed a pattern similar to that of the NH reconstructions with a little bit of a MWP, a small LIA and a very large late 20th century warmth...
Because of the rapid growth rate of the snails, which are a widespread invasive species in India, moisture - sensitive oxygen isotope ratios in growth bands in the animals» shells preserve week - to - week rainfall rates, the researchers found.
I'm doing my graduate work in the area of oxygen isotope paleothermometry (which I do think has a lot of advantage over dendroclimatology), so I'll just say a few general things, but I don't plan on reading the WUWT article in enough depth to disentangle it piece by piece (note for people who reply that I'd rather continue this in the April Open Thread since it is OT and this thread is still young).
(I think some of Lonnie Thompson's work on interpreting low - latitude oxygen isotope values as temperature signals in ice cores led to some issues).
From the European Association of Geochemistry New isotopic evidence supporting moon formation via Earth collision with planet - sized body A new series of measurements of oxygen isotopes provides increasing evidence that the Moon formed from the collision of the Earth with another large, planet - sized astronomical body, around 4.5 billion years ago.
Proxy climate indicators include oxygen isotopes, methane concentrations, dust content, as well as many other parameters.
Other evidence, especially oxygen isotopes in shells from deep - sea cores that reflected conditions in the entire North Atlantic, showed changes only over several thousand years.
What the team discovered was an odd oxygen isotope telling them that the sulfates came from gases that had undergone atmospheric reactions en route to the valley.
Back at their Georgia Tech lab, they analyzed the stalagmites for the ratio of oxygen isotopes contained in samples of calcium carbonate, the material from which the stalagmites were formed.
But recent studies of oxygen isotopes suggest that the level of CO2 was only a tenth of that required to melt the ice.
But more accurate measurements of oxygen isotopes published in 2016 only confirmed that the isotopic compositions are not distinguishable.
He realized that the skewed oxygen isotope ratios could be explained if the rock had been exposed to martian air or water for a long period.
Finding a difference Herwartz and his colleagues decided to examine oxygen isotopes because planets and moons have a distinct oxygen fingerprint that records the exact environmental conditions in which they were born.