Sentences with phrase «heavier oxygen isotope»

The heavier oxygen isotope ratio varies dependent upon the difference in vapour pressure due to the different atomic weights of normal and heavy oxygen based water.

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.

During cooling periods, when ice sheets are expanding, ocean bottom water accumulates heavy oxygen isotopes (oxygen 18).

The scientists examined surveys of the ratio of strontium to calcium content and heavy oxygen isotopes, both are sensitive recorders of sea surface temperatures past and present.

There is complexity in the path of the water vapor to the location, but the distance the water vapor travels is very important to the heavy oxygen isotope.

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.

Not exact matches

Heavy isotopes of carbon and oxygen bond together as a foram makes its shell — the cooler the temperature, the more they bond to each other.

The ratio of strontium to calcium in a given layer of coral reef — as well as the amount of a heavier isotope of oxygen in the carbonate itself — reflect the temperature in this historical record, but the isotopic information also reveals rainfall.

The abundance of bonds containing heavy isotopes of both oxygen and carbon are temperature - dependent, so they can give a reliable picture of the terrestrial climate.

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

David Hodell, Jason Curtis and Mark Brenner from the University of Florida obtained their evidence from the ratio of calcium carbonate to calcium sulphate in sediments from Lake Chichancanab, in Yucátan, Mexico, and from the proportion of heavy to light isotopes of oxygen in buried shells.

Warmer air temperatures cause more water containing the heavier isotopes oxygen - 18 or deuterium to evaporate from the surrounding ocean.

Studies of meteorites indicate that comets contain a greater proportion of the heavy isotopes oxygen - 17 and oxygen - 18 than terrestrial rocks.

During big storms, water vapor containing the heavy isotope oxygen 18 condenses and falls first, rendering local precipitation deficient in that isotope for up to several weeks.

The most convincing evidence for this, says Jouzel, comes from isotope ratios; ice that has frozen in site has a higher proportion of water molecules containing the heavy form of oxygen, oxygen - 18, than that of ice that has been transported over long distances by weather systems.

Dust from our own solar system has a characteristic ratio of heavy to light oxygen 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.

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.

Just as oxygen isotopes can be proxies for temperature, so can heavy metals in ice, be proxies for aerosols.

The key indicator is the «heavy» oxygen isotope δ18O.

Rainfall from cyclones contains relatively little heavy oxygen so analysing the oxygen isotope ratio of calcite in stalagmites can reveal the extent of cyclone activity.

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.

However, when measuring the isotopes in nitrate alone, the team found an unexpected imbalance in the ratio of heavy nitrogen and oxygen.