Sentences with phrase «oxygen isotopes with»

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.

Not exact matches

A few of those grains sport higher - than - normal proportions of oxygen - 17 and oxygen - 18 isotopes (as compared with the universe's predominant form of the element, oxygen - 16).

When the researchers analyzed the oxygen isotope ratios over the past 8,000 years, they found that the jet stream became wavier — with colder Eastern winter weather and warmer Western winter weather — on about a 4,000 - year cycle.

They then compared the oxygen isotope ratio in Yonderup dripwater with that predicted by a model (which simulated the dripwater δ18O based on measurements of rainwater δ18O), as well as that measured at a different cave in the region.

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.

When ocean storms bump into mountains, raindrops burdened with heavy isotopes of oxygen and hydrogen are the first to precipitate.

Tree rings can tell tales because hurricanes produce rain with low amounts of a specific isotope — oxygen - 18.

The osmium isotope evidence found in black shales correlates with higher continental weathering as a result of oxygen in the atmosphere.

By comparison, slightly younger deposits with lower molybdenum and rhenium concentrations had osmium isotope evidence for less continental input, indicating the oxygen in the atmosphere had disappeared.

The researchers could tell that seeds had been deposited higher up the mountain than they had been harvested by the ratio of their oxygen isotopes, which changes with altitude.

They next measured overall energy expenditure by giving volunteers water laced with hydrogen and oxygen isotopes and measuring how much was excreted in urine.

The oxygen and carbon isotopes present in the remains provided them with records of temperature and humidity levels during the period.

Oxygen isotope ratios in carbonate sediments are correlated with the ratio of precipitation to evaporation and thus indicate aridity.

The secret to Mars» climate lies in the fact that zircons (ZrSiO4) contain oxygen, an element with three isotopes.

This allowed them to distinguish between shells composed of the relatively lightweight isotopes of carbon and oxygen versus those made with a higher proportion of heavier isotopes.

«When ozone reacts with carbon dioxide in the atmosphere, it transfers its isotopic weirdness to the new molecule,» said Shaheen, who investigated this process of oxygen isotope exchange as a graduate student at the University of Heidelberg in Germany.

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.

What's Next: The team also is developing techniques that would work with other isotopes, including nitrogen and oxygen.

The proxy works like this: Although water can form using either a light or a heavy oxygen isotope, snails more readily draw in water with oxygen - 16 than with its heavier counterpart, oxygen - 18.

Although LGM oxygen isotope changes can not be used to independently assess cooling, they provide a useful additional constraint that is difficult to reconcile with a cooling much less than 3 deg.

First, I do think that there is a lot of work to be done in the interpretation of oxygen / hydrogen isotope values obtained at a site, and there's still plenty of disagreement in the paleo - community on how to best connect the isotopic signal in a record with climate.

Curiosity measured the same pattern in isotopes of hydrogen, as well as carbon and oxygen, consistent with a loss of a substantial fraction of Mars» original atmosphere.

Oxygen isotope ratios (δ18O) in polar snow are well known to be correlated with temperature, and the underlying physics of the relationship is very well understood.

Although LGM oxygen isotope changes can not be used to independently assess cooling, they provide a useful additional constraint that is difficult to reconcile with a cooling much less than 3 deg.

First, I do think that there is a lot of work to be done in the interpretation of oxygen / hydrogen isotope values obtained at a site, and there's still plenty of disagreement in the paleo - community on how to best connect the isotopic signal in a record with climate.

I always think of it as anthropogenic CO2 is «old» carbon with «young» oxygen, the old and young part being determined by isotope analysis similar to carbon dating.

Temperature is often the easiest thing to measure, thanks to the oxygen isotope ratio correlating with air temperature, but it is not necessarily the most relevant.

When glaciers melt, fresh water, enriched in light oxygen isotopes (oxygen 16), mixes with the bottom water.

SALINITY (in strict physical oceanography terms - in PSU), mediates the amount of δ18O of seawater and ONLY the δ18O of seawater parameter along with temperature can physically change the stable oxygen isotopes of foraminifera.

The team then compared the oxygen isotope ratio for each year's wet season from 1990 to 2010 with a cyclone activity index of the average accumulated energy expended, based on factors such as number of cyclones, cyclone strength, size and time on storm track.

The three lines are: (1) the beginning: the Khirthar transgression and the onset of neritic carbonate accumulation in the Bartonian Age (preceding onset of the Middle Eocene climatic optimum [MECO]-RRB-; (2) the midlife change (Bartonian - Priabonian transition): the shift from carbonate - rich to carbonate - poor, higher - nutrient environments under estuarine circulation, causing widespread dysaerobia culminating in opaline silicas; and (3) the Eocene - Oligocene = Priabonian - Rupelian boundary and glaciation during oxygen isotope event Oi - 1, with return of improved ventilation in neritic environments and resumption of carbonate accumulation.

These Holocene glacier expansions are consistent with other millennial evidence e.g. treelines moving south, ice core melt and oxygen isotopes.

Stable isotope ratios of oxygen reflect water temperatures, with higher δ18O values indicating colder water [6], [9], [12], such as water upwelled from lower depths.

Phytoplankton prefer to consume nitrate with lighter oxygen and nitrogen isotopes, so they leave behind heavier isotopes; measuring these can reveal microbial activity in the environment.

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.

Prior to this, persistent warmth occurred from 1970 to 1975, a prominent anomaly that has been noted before (Schwerdtfeger 1976; Mosley - Thompson et al. 1991) and is consistent with positive anomalies of atmospheric mass over the Antarctic (Swanson and Trenberth 1981), and with positive oxygen isotope anomalies in West Antarctic ice cores (Mosley - Thompson et al. 1991).

The proxy works like this: Although water can form using either a light or a heavy oxygen isotope, snails more readily draw in water with oxygen - 16 than with its heavier counterpart, oxygen - 18.

Dee, S., et al. (2015), PRYSM: An open - source framework for PRoxY System Modeling, with applications to oxygen - isotope systems, J. Adv. Model.

1) M&W used the first, not realizing that those aren't the exact words from Bradley, which is «major ions and isotopes of hydrogen and oxygen», which is parsed (major ions) and (isotopes of H and O), because «major ions» in thsi context has a specific meaning and it has nothing to do with H&O.

We use the rich climate history of the Cenozoic era in the oxygen isotope record of ocean sediments to explore the relation of climate change with sea level and atmospheric CO2, inferring climate sensitivity empirically.

But not with (ions and isotopes) of (hydrogen and oxygen), and speleotherms (when Bradley never uses that), and the odd «artifacts.»

Our knowledge comes from two methods of interpreting oxygen isotopes from the deep ocean that seem to agree nicely with each other.

Isotope analysis allows us to identify that this CO2 is the result of «old» carbon combining with «new» oxygen which is a clear signature of fossil fuel combustion produced CO2.