Sentences with phrase «isotopic signature does»

Sharpe admits that's a possibility, but she thinks the dogs» isotopic signature doesn't quite match the signal you'd expect from dogs consuming maize - heavy feces.

Not exact matches

The results, published online today in Science, reveal that the inclusions have a much lighter isotopic signature than does the ocean, suggesting that the composition of seawater has indeed evolved over time.

Comprehending the isotopic signature of fossil fuel loading of the air does not need calculations of nuclear states and decay paths.

Scientists must think about which microbes are «making the methane [and] what does that say about the isotopic signature of the methane in the atmosphere,» McCalley told Eos.

The statement that only 55 % of human CO2 emissions have been removed by the biosphere / biosphere is something you'll have to prove, which is hard because as far as I'm aware human CO2 does not posses an isotopic signature that can be easily differentiated from natural sources — the arguments you often hear on Skeptical Science are measurements in changes of the C12 / C13 / C14 atmospheric mass, not individual CO2 molecules, which can be misleading.

The content of the air is made of two sets (CO2 anthropic from emissions)(t) and (CO2 natural)(t); the lifetime of the molecules is the same for both sets and is known to be in the range 3 to 7 years; once a lifetime is assumed the (CO2 anthropic from emissions)(t) and its delta13C can be computed to get (CO2 natural)(t) and its isotopic signature; this is done for several assumed lifetimes of CO2 molecules in the air.

# 256 Ray: you do realize that anthropogenic (e.g. fossil fuel) CO2 has a different isotopic signature than CO2 from other sources