Sentences with phrase «atmospheric oxygen concentrations»

It's not just the isotopic signature, or the decline of atmospheric oxygen concentrations — which is the signature of the source of the CO2 being combustion... It's also this simple mass balance argument.

University of Michigan climate scientist Chris Poulsen, lead author of the study «Long - term climate forcing by atmospheric oxygen concentrations» in Science.

«During photosynthesis plants bind atmospheric carbon, whose isotopic composition is preserved in resins over millions of years, and from this, we can infer atmospheric oxygen concentrations,» explains Ralf Tappert.

Lyons notes that the factors controlling the rise of animals are under close scrutiny, including challenges to the long - held view that a major rise in atmospheric oxygen concentrations triggered the event.

The team used the data from charcoal in coal to propose that the development of fire systems through this interval was controlled predominantly by the elevated atmospheric oxygen concentration (p (O2)-RRB- that mass balance models predict prevailed.

The change in atmospheric oxygen concentration in recent years is consistent with the amount of fossil fuel that was burned in those years.

With all the hydrocarbons we burn it is my understanding that atmospheric oxygen concentration has been steadily decreasing.

Measured decreases in the fraction of other forms of carbon (the isotopes 14C and 13C) and a small decrease in atmospheric oxygen concentration (observations of which have been available since 1990) show that the rise in CO2 is largely from combustion of fossil fuels (which have low 13C fractions and no 14C).

Not exact matches

Curiously, the decline in atmospheric oxygen over the past 800,000 years was not accompanied by any significant increase in the average amount of carbon dioxide in the atmosphere, though carbon dioxide concentrations do vary over individual ice age cycles.

Because diffusion becomes less efficient as the tubes get longer, the atmospheric concentration of oxygen is a powerful constraint on body size, especially for active insects that fly.

At the end of these glaciations, considerable rise in marine arsenic concentrations concurred with rapid demise of atmospheric oxygen.

«Changes in ocean conditions that affect fish stocks, such as temperature and oxygen concentration, are strongly related to atmospheric warming and carbon emissions,» said author Thomas Frölicher, principal investigator at the Nippon Foundation - Nereus Program and senior scientist at ETH Zürich.

The oxygen (in much higher concentration than atmospheric), says Matt, stimulates cell regeneration and boosts immunity.

We find that the global methane hydrate inventory decreases by approximately 70 % (35 %) under four times (twice) the atmospheric CO2 concentration and is accompanied by significant global oxygen depletion on a timescale of thousands of years.

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).

WG1 chapter 6, figure 3 Concentrations of carbon dioxide and oxygen in the atmosphere Atmospheric concentration of a) carbon dioxide in parts per million by volume from Mauna Loa (MLO, light green) and the South Pole (SPO, dark green) and of b) changes in the atmospheric concentration of O2 from the northern hemisphere (ALT, light blue) and the southern hemisphere (CGO, dark blue) relative to a standard value.

The paper, «Reconstruction of past atmospheric CO2 concentrations by ice core analysis», acknowledges that, due to impurities, liquid water can exist as low as -50 deg C. Diffusion of CO2 into this water, due to its far higher solubility than nitrogen and oxygen, will partially deplete the CO2 from trapped air bubbles.