Sentences with phrase «warm intervals»

In 2013, he returned to Oxford where much of his current research aims to document and understand past climate variability, particularly during exceptionally warm intervals of Earth history, such as the Cretaceous.

Below you'll hear from scientists with significant concerns about keystone sections of the paper — on the evidence for «superstorms» in the last warm interval between ice ages, the Eemian, and on the pace at which seas could rise and the imminence of any substantial uptick in the rate of coastal inundation.

The Pliocene is a paradox when compared to other Cenozoic warm intervals because global mean temperatures were 2 — 3 °C warmer than present (Dowsett, 2007), despite levels of atmospheric CO2 that were only slightly higher than preindustrial levels (Fedorov et al., 2006).

The excerpt below follows a discussion of evidence that warming is likely to replicate conditions that persisted for millenniums during the last warm interval between ice ages, the Eemian, centered around 125,000 years ago.

The optimal estimate identifies alternating cooling and warming intervals from 1877 to 2005.

«the period from around AD 830 to 1100 generally encompassed a sustained warm interval in all four Northern Hemisphere regions.

But it also confirms many researchers» suspicion that higher carbon dioxide levels coincided with warmer intervals during the study period.

DeConto and Pollard's study was motivated by reconstructions of sea level rise during past warm periods including the previous inter-glacial (around 125,000 years ago) and earlier warm intervals like the Pliocene (around 3 million years ago).

Over the past two million years, Earth has experienced long glacial periods separated by short, warmer intervals known as interglacials.

«In the last warm interval on Earth (called the Eemian), global temperatures were likely only +0.2 or +0.3 degrees Celsius warmer than today (+1 degrees maximum), and sea level was +5 to +9 meters higher.

Those questioning the vulnerability of this species to warming will point to its successful survival through two previous warm intervals between ice ages as evidence the bear can deal with reduced ice and other big environmental shifts.

We also found that temperatures in some regions were higher in the past then they were during the late 20th century and that, the longer the individual site record, the more likely it was to show prior warm intervals, which is consistent with the long - term cooling trend.

The research, led by Chronis Tzedakis of University College, London, examined similarities between the current warm interval between ice ages and a particular point, around 780,000 years ago, during a past warm period known as Marine Isotope Stage 19.

A new analysis of the dramatic cycles of ice ages and warm intervals over the past million years, published in Nature, concludes that the climatic swings are the gyrations of a system poised to settle into a quasi-permanent colder state — with expanded ice sheets at both poles.

And there are plenty of important questions to resolve about the climate of the Holocene — this comfy warm interval humans have enjoyed since the end of the last ice age — before the human influence on the system built in recent decades.

«Remarkably, the presented records allow direct comparison of recent warming with former warm intervals such as the Roman or the Medieval periods.

This FLIP «fingerprint» was found to be restricted to the Pliocene warm intervals and was absent from the overlying younger sediments.

The authors claim to have largely resolved the «divergence problem» through judicious application of RCS, and in doing so find broad agreement between the instrumental and proxy record during the «entire 20th century warming interval», as stated in the abstract.

«Meltwater Pulse 1a from Antarctica as a Trigger of the Bølling - Allerød Warm Interval.»

However, the period from around ad 830 to 1100 generally encompassed a sustained warm interval in all four Northern Hemisphere regions.

«We're suggesting that's not even the case, and that it's one of these hyper - warm intervals because the bird's food sources and the whole part of the ecosystem could not have survived in ice.»

However, peat formed during these warm intervals was not extensively decomposed compared to peat formed during cooler periods.

«These are huge climate swings, from Snowball Earth to one of the warmest intervals of Earth history in the Cambrian,» says Lee Kump of Penn State University in University Park.

Here's another way to frame the question: Have we left the Holocene Epoch — the warm interval since the end of the last ice age some 10,000 years ago — and entered what is increasingly described as a geological epoch or age of our own making?

Dr. Alley, a geoscientist at Pennsylvania State University, has been featured here before for his unconventional outreach techniques, which include an illuminating «dance» explaining the cycles of ice ages and warm intervals and music videos on geological science in which he comes across as a mash - up of Johnny Cash and Woody Allen.

In the short video above, Dr. Alley explains how some patterns in the changes that occur during Earth's ice ages and warm intervals (like the last 11,000 years) prove that greenhouse gases exert a warming effect.

Ever since the planet descended into a cycle of ice ages and warm intervals 2 million years ago, glaciers have surged and ebbed like a slow, cold tide.

Reconstructions indicate that during the Pliocene there were prolonged (~ 200,000 years) warm intervals, when spring and summer sea surface temperatures were between 2 and 6 oC above modern levels, with a general background theme of warmer - than - present temperatures.

They found that the diatom - rich sediments, deposited during the warm intervals, were predominantly composed of material from one terrane - the Jurassic to Cretaceous volcanic rocks and associated sedimentary rocks of the Ferrar Large Igneous Province (FLIP).

Its key finding is that during the Pliocene there occurred a series of long, warm intervals during which parts of the East Antarctic Ice - Sheet margin retreated hundreds of kilometres inland.

As indicated by the red line, the warmest interval of the 20th century is not unique, having been eclipsed four times previous (see the shaded red circles) in the 373 - year record — once in the 17th century, twice in the 18th century and once in the nineteenth century.

Today we are in a warm interval — an interglacial — between ice ages.