Sentences with phrase «isotopic signals»

It took on the order of 100 kyr for the oxygen and carbon isotopic signals in the ocean to return to their original steady - state values after the PETM.

Jessica Oster from Vanderbilt University walks Mike through the long, incredibly long, process of permitting, extracting, transporting, sampling, analyzing, and understanding the isotopic signals encoded in these bedeviling but transporting recorders.

«No one was really looking at how the isotopic signals that were being generated in the atmosphere and the ocean were being transformed in the sediment.

Now, locked in limestone that was formed in shallow seawater offshore of the supercontinent Pangaea, scientists have found an isotopic signal to support a sharp drop in pH. The catastrophe holds a cautionary lesson: Due to the burning of fossil fuels, today's oceans are acidifying at an even faster rate than they were at the time of the extinctions, although it hasn't yet persisted nearly as long.

First, I do think that there is a lot of work to be done in the interpretation of oxygen / hydrogen isotope values obtained at a site, and there's still plenty of disagreement in the paleo - community on how to best connect the isotopic signal in a record with climate.

More than likely, the isotopic signal (the distribution of 13C - depleted carbon that invaded the atmosphere) indicates that carbon should have been «mined» from the Southern ocean as a result of the displacement of southern winds, sea ice, and perturbations to the ocean's biological pump (e.g., Anderson et al., 2009).

[Response: Unfortunately, you seem to have conveniently forgotten that Keigwin (and Pickart) published a paper in Science just a few years later in 1999 pointing that the appparent cooling (actually, the oxygen isotopic signal in question isn't entirely temperature, it is salinity as well, so the quantative 1 deg cooling estimate you cite is not actually reliable) in the Sargasso Sea is diametrically opposed by a substantial warming at the same time in the Laurentian Fan region of the North Atlantic off the coast of Newfoundland.

First, I do think that there is a lot of work to be done in the interpretation of oxygen / hydrogen isotope values obtained at a site, and there's still plenty of disagreement in the paleo - community on how to best connect the isotopic signal in a record with climate.

Although it is unclear how much of the water pool available for photosynthesis is derived from winter versus summer precipitation, research on oxygen isotopes in modern larch suggests that larch rely on spring snow melt and thus integrate the isotopic signal of annual precipitation (Sugimoto et al., 2002).

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).

A group of scientists believe that a previously unexplained isotopic ratio from deep within Earth may be a signal from material from the time before Earth collided with another planet - sized body, leading to the creation of the Moon.

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.