Sentences with phrase «stable isotope ratios»

More recently, in the Paleocene - Eocene Thermal Maximum, about 55 million years ago, a rise of 5oC in ocean temperature (recorded in stable isotope ratios in various geological deposits) and 8oC on land occurred.

Stable isotope ratios of carbon and nitrogen are especially popular in ecological studies.

No, some other animal probably converted the grass into meat on the hoof, and the hominids got the characteristic carbon stable isotope ratio from eating the grazing animal — they ate grass indirectly, at one remove.

In recent years, ecologists have increasingly relied on stable isotope ratios to define and quantify part of an organism's niche.

Here we compared the methane production between runnel and polygonal ponds using stable isotope ratios, 14C signatures, and investigated potential methanogenic communities through high - throughput sequencing archaeal 16S rRNA genes.

The δ18O stable isotope ratio was the first palaeothermometer, proposed by Urey [38] and developed especially by Emiliani [39].

This likely influences geographic variation in surface nutrient availability, and therefore stable isotope ratios in POM, primary producers [12] and consumers [14].

Early TRL projects focused on establishing long tree - ring records from temperature - sensitive boreal forest locations in North American for studies of global change, using dendrochronologically dated wood, to investigate the value of stable isotope ratios in cellulose as paleo - thermometers and developing the necessary computer software for processing the data.

As precipitation moves inland, water with the heavier form of hydrogen falls out first, which creates predictable patterns of the stable isotopes ratios of precipitation across continents.

Using spectroscopy, stable isotope ratios (carbon, nitrogen and sulphur) were investigated in the collagen of the bones, along with the ratio of strontium to calcium in the bone mineral.

The team first analyzed the responsiveness of bryophytes to the four metrics based on distribution patterns, the nitrogen content and the stable isotope ratio in bryophytes.

White immersed himself in the carbon cycle, stable isotope ratios, and solar radiation fluctuations, trying to fathom their interactions.

(a) Severity of nitrogen pollution evaluated by the percentage of nitrogen content (N %), (b) Degree of NOx pollution evaluated by the stable isotope ratio of nitrogen in bryophytes -LRB-?

The team found that the degree of nitrogen pollution, which is worsening in urban areas, can be evaluated by analyzing the nitrogen content and the stable isotope ratio in bryophytes.

It basically says that ringwidth is a function of: age trend + climate signal + endogenous (local) disturbances + exogenous (standwide) disturbances + unexplained variation Basically, this concept also underlies all other dendro proxies, be it maximum latewood density or stable isotope ratios, even though there are variations, e. g. age trend in density data is treated differently from ring width data).

One graph I have NOT so far been unable to locate is a correlation between ring width, stable isotope ratios, and temperature.

This analytical document shows that stable isotope ratios can be used to monitor changes in the character of precipitation in response to periodic variability or changes in climate.

There is no mechanism for the temperature of a location on an ice sheet to dictate the stable isotope ratios in the snow that falls there.