Sentences with phrase «used oxygen isotope ratios»
In this study, we used oxygen isotope ratios, which is a commonly used palaeothermometer.
https://phys.org/ Not exact matches
«Oxygen in the water that mammals drink is preserved in the phosphate in their teeth, so these can be used to calculate isotope ratios.
The team used records of oxygen isotope ratios (which provide a record of ancient water temperature) from microscopic plankton fossils recovered from the Mediterranean Sea, spanning the last 5.3 million years.
«Scientists use the ratio of the various sulfur isotopes as their strongest evidence for atmospheric oxygen.»
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.
That seems a way more satisfactory approach than the crude estimate in Hansen et al (2013) that I've been using, which relies on an interpretive leap from a deep water temperature proxy (oxygen isotope ratios from the microscopic shells of bottom - dwelling marine critters).
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).
The analysis below used the ratio of oxygen isotopes in the stalagmites to estimate the water temperature at the time they were formed.
Stable oxygen isotope ratios contained in the shell can be used to infer past water temperatures.
The principal dataset we use is the temporal variation of the oxygen isotope ratio (δ18O relative to δ16O; figure 1a right - hand scale) in the shells of deep - ocean - dwelling microscopic shelled animals (foraminifera) in a near - global compilation of ocean sediment cores [4].