Sentences with phrase «oxygen isotope analysis»

The correlation between atmospheric CO2 concentrations and global temperatures (I assume the global temperature readings are through Oxygen isotope analysis, but I am not sure how the CO2 readings were determined).

Preliminary results of oxygen isotope analysis of tree rings suggests anomalously low values during the 11th Century, perhaps indicating large - scale changes in circulation.

Carbon and oxygen isotope analyses of teeth from the Ar.

«Oxygen Isotope Analyses and Pleistocene Temperatures Re-Assessed.»

Not exact matches

The rover's Sample Analysis at Mars (SAM) instrument that analyzes the soil and atmosphere around the rover using a mass spectrometer, a gas chromatograph and a tunable laser spectrometer to detect oxygen and carbon isotopes in carbon dioxide and methane samples to see if they are biochemical in origin.

Analyses of samples brought back from the Apollo missions in the 1970s showed that the Moon has the same abundances of the three stable isotopes of oxygen as Earth.

In his talk, Agee presented the results of the isotope analysis for oxygen as well as hydrogen.

That dramatic idea encountered skepticism until an analysis of the lunar rocks showed that they have the same mix of oxygen isotopes as rocks found on Earth, strongly suggesting a shared origin.

The team based its analysis on ratios of oxygen and hydrogen isotopes in ice cores drilled in East Antarctica.

Knudson and Ravelo based their findings on an analysis of carbon and oxygen isotopes in the calcium carbonate shells of tiny marine organisms called foraminifera, which are preserved in seafloor sediments.

To date, we have a full complement of analyses for about three years of growth for one tusk from the Taimir Peninsula of Siberia (the Jarkov mammoth; ca. 20,300 rybp) and growth increment and tusk apatite carbon and oxygen isotope ratios for two to three years of growth from two tusks from Wrangel Island (4,400 and 4,120 year bp).

To date, we have a full complement of analyses for about three years of growth for one tusk from the Taimir Peninsula of Siberia (the Jarkov mammoth; ca. 20,300 rybp) and growth increment and tusk apatite carbon and oxygen isotope ratios for two to three years of growth from two tusks from Wrangel Island (4,400 and 4,120 year bp).

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.

Statistical analysis of the carbon and oxygen stable isotope recordsr eveals variations in the periods around 100, 11 and 3 years.A century scale connection between the 13C / 12C record and solar activity is most evident.»

The analysis below used the ratio of oxygen isotopes in the stalagmites to estimate the water temperature at the time they were formed.

Furthermore, we found no relationship between δ13C and δ18O (linear mixed effect model, coefficient = − 0.012, df = 82, p = 0.925) when we structured the analysis by individual, a result that might have indicated metabolic effects on carbon and oxygen isotopes (e.g. [23]-RRB-.

In order to complete my analysis, I divided the beetles into five marine oxygen isotope intevals, as Elias did in his paper.

Analyses of the oxygen isotopes of these fossils suggested very warm temperatures for high latitude seas (~ 65 ° S), probably between 20 °C to 25 °C.

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.

In the 1970s, the first comprehensive analysis of oxygen isotopes in sediments from cores taken from the sea floor established for the first time that the timing of the Ice Ages was linked to subtle changes in the Earth's orbit around the Sun as suggested long ago by Serbian mathematician Milutin Milankovitch.