Sentences with phrase «measuring ancient temperatures»

Paul Nurse (voice over): Tree rings have been shown to be a good way of measuring ancient temperatures, and they've mostly matched instrumental measurements since the advent of thermometers.

Not exact matches

NASA's WMAP satellite measured the temperature of this ancient light, revealing fluctuations in the density of matter in the very early universe.

In carbon dioxide, for example, these multiple isotopes are found more often than expected — a phenomenon called clumping — which leads to a powerful tool for measuring the temperatures at which the molecules formed, now and in the ancient past.

By measuring the bonds of prehistoric alkenones preserved in ancient layers of lake sediment, the team opened a window on Arctic temperature change since the end of the last Ice Age.

The point being that these very ancient discrepancies exist but, as noted in the post (follow the «controversial» link) the correlation with CRF over geological time with temperature as measured by proxy data has not been established.

The linear trend line is now at +1.06 °C, which is perhaps the best temperature to compare to paleoclimate temperatures, because the latter are «centennially - smoothed,» i.e., the proxy measures of ancient temperature typically have a resolution not better than 100 years.

Because we didn't have a systematic global set of thermometer measurements before the 1880s, scientists look at other things they can measure — sediment deposits, or tree ring growth in certain ancient, slow - growing trees — which tend to vary along with temperature.

The study, led by Michael E. Mann, a climatologist now at Pennsylvania State University, was the first to estimate widespread climate trends by stitching together a grab bag of evidence, including variations in ancient tree rings and temperatures measured in deep holes in the earth.