Sentences with phrase «different isotopic»

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

(Land volcanoes are from subduction zones so I'd expect more rapid recycle of C from ocean sediment to yield a different isotopic ratio...)

CO2 produced from burning fossil fuels or burning forests has quite a different isotopic composition from CO2 in the atmosphere.

Therefore, animals that feed on tropical open - environment grasses (or on grass - eating animals) have different isotopic compositions from those feeding on browse, seeds, or fruit from shrubs or trees.

That helped narrow down the sources, Schaefer says, because different types of wetlands have different isotopic signatures.

But planetary bodies that formed in different parts of the solar system generally have different isotopic compositions, so different that the isotopic signatures serve as «fingerprints» for planets and meteorites from the same body.

Not exact matches

These layers may be visible, related to the nature of the ice; or they may be chemical, related to differential transport in different seasons; or they may be isotopic, reflecting the annual temperature signal (for example, snow from colder periods has less of the heavier isotopes of H and O).

The researchers brought together 90 fossils discovered in South Africa, Lesotho, Morocco and China, 63 of which were therapsids belonging to 22 different species, in order to study their oxygen isotopic composition.

Low background atmospheric concentrations, together with well - known and often distinct isotopic characteristics (variants of lead with different atomic weights) of industrial sources make lead an ideal tracer of industrial pollution.

Their physical bodies are data, you can track where they've been because of the discrete isotopic characteristics of different parts of the ocean.

This process is a function of the temperature, so in looking at the isotopic composition in the different dated layers of the ice, scientists can study the temperature of the past.

«There could be unique biochemistry, because the isotopic signature of the biomass of microorganisms oxidizing methane in freshwater wetlands is different from their marine counterparts.

The hockey stick - shape temperature plot that shows modern climate considerably warmer than past climate has been verified by many scientists using different methodologies (PCA, CPS, EIV, isotopic analysis, & direct T measurements).

This talk provides an overview and tour of the findings from Curiosity, featuring spectacular high definition images, tantalizing mineralogical evidence for fresh water, and atmospheric isotopic measurements indicative of an ancient climate different from today.

Mortimer et al. (2017b) discuss new Ar / Ar and limited U — Pb ages and geochemistry (both trace element and Nd isotopic analyses) of widespread volcanism on the northern part of the Zealandia continent by using dredged samples obtained in different cruises and integrated with their earlier findings on the southern Zealandia in an attempt to give a more updated picture of magmatism across the whole Zealandia continent.

The UniChem connectivity search function allows users to find not only exact matches of their chemical structure across 60 million related molecules from 21 data sources worldwide, but also identifies «equivalent» structures that have the same atom connectivity while differing in stereochemistry or isotopic composition, or which exist in a different salt form.

Stable isotope geochemistry is the study of how physical and chemical processes can cause isotopes — atoms of an element with different numbers of neutrons — to separate (called isotopic fractionation).

To replicate the observed isotopic offset, the model requires that enhanced levels of organic - carbon and pyrite burial continued a few hundred thousand years after peak organic - carbon burial, but that their isotope records responded differently due to dramatically different residence times for dissolved inorganic carbon and sulfate in seawater.

To those that still question Mike's research, know this: since the first hockey stick paper of 1998, there have been more than a dozen studies published by many scientists using different methodologies (PCA, CPS, EIV, isotopic analysis, & direct T measurements) that duplicate the hockey stick.

The isotopic mix in the atmosphere is different than any of the sources so dissolution of natural CO2 can not be preferred over Anthropogenic CO2.

The study focused on unique isotopic signatures of methane from different sources.

We assumed only that due to the biological and physical effects the ratio fabsorbed (t) / (total CO2 content of then air) is more or less constant, hence a simple response pulse response exp -LRB-- t / lifetime) is applied to the anthropic time series of coal, gas, oil and cement which have different delta13C As the isotopic signature of (CO2 natural)(t) is slowly decreasing because plants living days or centuries ago are now rotting and degassing and as molecules entered in the ocean decades ago are now in the upwellings after a slow migration along the equal density surface from the high latitudes where those surface are surfacing at depth zero, there are common sense constraints or bounds on the possible evolution of the delta13C of the natural out - gassed CO2 molecules.

Consider the facts: the climate system is indicated to have left the natural cycle path; multiple lines of evidence and studies from different fields all point to the human fingerprint on current climate change; the convergence of these evidence lines include ice mass loss, pattern changes, ocean acidification, plant and species migration, isotopic signature of CO2, changes in atmospheric composition, and many others.

By looking at the distinct isotopic signatures, the researchers could differentiate between methane produced from fracking, for instance, and methane produced from agriculture, because they each have different signatures.

Because the different isotope ratios for the two kinds of plants propagate through the food chain, it is possible determine if the principal diet of a human or other animal consists primarily of C3 plants or C4 plants by measuring the isotopic signature of their collagen and other tissues.