Sentences with phrase «oxygen isotope data»

135: It has been suggested that the 100 ka cycle in oxygen isotope data is due to changes in orbital inclination relative to the invariable plane (perpendicular to the solar system's angular momentum).

The method should also be tested against the hurricane - related oxygen isotope data collected in 2004 and 2005, if that is possible for recent tree growth.

Not exact matches

By looking at the chemistry of rocks deposited during that time period, specifically coupled carbon and sulfur isotope data, a research team led by University of California, Riverside biogeochemists reports that oxygen - free and hydrogen sulfide - rich waters extended across roughly five percent of the global ocean during this major climatic perturbation — far more than the modern ocean's 0.1 percent but much less than previous estimates for this event.

It is measurable in terms of oxygen and carbon isotope ratios and was compared to «environmental archive» data from other parts of the earth.

They also used satellite precipitation data to «backsolve» the brine's origins using sodium concentrations, oxygen and hydrogen isotopes, as the isotopic composition of water reflects the condensation temperature and precipitation rate over time.

The new findings on Arctic Ocean salinity conditions in the Eocene were calculated in part by comparing ratios of oxygen isotopes locked in ancient shark teeth found in sediments on Banks Island in the Arctic Circle and incorporating the data into a salinity model.

The paleoclimate data, which included mainly changes in the oxygen isotopes of the calcium carbonate deposits, were then compared to similar records from other caves, ice cores, and sediment records as well as model predictions for water availability in the Middle East and west central Asia today and into the future.

They limited data sources to locations around the world in which paleoceanographic data also exist, using seven variables: salinity; potential temperature; oxygen isotope ratios in water; carbon isotope ratios in dissolved inorganic carbon; and concentrations of phosphate, nitrate, and dissolved oxygen.

Like the data used right through 0.02 to 66 My, the Freidrich et al collection comprises stable oxygen isotope ratios from the shells of tiny bottom - dwelling, deep - water marine organisms (benthic foraminifera).

Isotopes of carbon and oxygen were sampled on an annual time scale while all environmental data was finer - grained, ranging from half - hourly to monthly.

For a few years they held their ground, for it turned out that Emiliani's data on oxygen isotopes taken up in plankton shells did not directly measure ocean temperatures after all.

We use isotope data from Zachos et al. [4], which are improved over data used in our earlier study [5], and we improve our prescription for separating the effects of deep ocean temperature and ice volume in the oxygen isotope record as well as our prescription for relating deep ocean temperature to surface air temperature.

Although a previous estimate based on this approach yielded a MAT of approximately — 5 °C, additional information from oxygen isotopes in mosses at the site allowed us to calculate isotopic enrichment in the cellulose of fossil trees, thereby reducing assumptions and increasing the precision of our MAT estimates (see the Data Repository).

Schmidt, G.A., 1999: Forward modeling of carbonate proxy data from planktonic foraminifera using oxygen isotope tracers in a global ocean model.

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).