Sentences with phrase «during glacial periods»

This was during glacial periods suggesting they were well adapted to these harsh conditions.

: the fact that the ocean was colder during glacial periods by itself explains only about 10 % of the CO2 change.

Perhaps there is less mud to work with during the glacial period.

... showing that atmospheric concentrations of CO2 during the glacial period was 50 % lower than the pre-industrial concentration, a result predicted by Arrhenius nearly a century earlier.

It is called the «driftless» area because glaciers drifted around this area during the glacial period.

The results of our recent study suggest that the Atlantic water never ceased to flow into the Nordic Seas during the glacial period,» says Mohamed Ezat, PhD at Centre for Arctic Gas Hydrate, Environment and Climate (CAGE) at UiT, The Arctic University of Norway.

In many respects, this phase seems to have resembled some of the earlier interstadials that had occurred so many times before during the glacial period.

In addition, during the glacial period large sections of tropical rain forest changes to savannah (About a third of the tropical forest changes to savannah.

Similarly, a colder climate with generally decreased humidity q O could be closer to the critical threshold, which might be the reason for less - stable monsoon circulations during glacial periods.

Researchers at the Laboratoire Ecologie des Systèmes Marins Côtiers (CNRS / IRD / Universités Montpellier 1 and 2 / IFREMER) and the Laboratoire CoRéUs 2 (IRD) have shown that the current distribution of tropical marine biodiversity is mainly due to the persistence of such refugia during glacial periods in the Quaternary.

They demonstrate that the phenomenon of major temperature fluctuations during glacial periods has by no means manifested uniformly worldwide, but has instead varied from region to region.

Chemical analyses of ocean cores show that the Southern Ocean drew down at least that much CO2 millions of years ago during glacial periods.

«The key that unlocked the mystery was the colder atmosphere and extensive sea ice around Antarctica during the glacial period.

The researchers found that during glacial periods when the atmosphere was colder and sea ice was far more extensive, deep ocean waters came to the surface much further north of the Antarctic continent than they do today.

Bottom: Ocean currents during glacial periods.

In a new study published today, the researchers show that rising levels of CO2 could have reached a tipping point during these glacial periods, triggering a series of chain events that caused temperatures to rise abruptly.

«Scientists throw light on mysterious ice age temperature jumps: New study reveals carbon dioxide «tipping point» that triggered abrupt warming during glacial periods.»

Using climate models to understand the physical processes that were at play during the glacial periods, the team were able to show that a gradual rise in CO2 strengthened the trade winds across Central America by inducing an El Nino - like warming pattern with stronger warming in the East Pacific than the Western Atlantic.

An early study suggested that these pingos formed on land during the glacial period, and are therefore relics from the ice age, just like the Arctic subsea permafrost.

One example is the spotted hyena, which is living in Africa today, but which appeared also in Europe during the glacial period.

Historically, methane concentrations in the world's atmosphere have ranged between 300 and 400 nmol / mol during glacial periods commonly known as ice ages, and between 600 to 700 nmol / mol during the warm interglacial periods.

What Bond showed is that there are quasi-cycles that Bond argued have the same cause as the ones during the glacial period.

Manabe and Stouffer (1993) pioneered the demonstration of a transition under future warming; an improved model showed a shutdown was especially likely with rapid increase of greenhouse gas emissions, Stocker and Schnitter (1997); see also Broecker (1997); Wood et al. (1999); summary: Rahmstorf (1999); Ganopolski and Rahmstorf (2001) for instability during a glacial period; IPCC (2001a), pp. 439 - 40.

[5] These changes have been reflected by constantly shifting vegetation, for example forest communities dominating most areas in interglacial periods, and herbaceous communities dominating during glacial periods.

Data from modern ice stream beds are difficult to obtain, but where ice advanced onto continental shelves during glacial periods, extensive areas of the former bed can be imaged using modern swath sonar tools.

During glacial periods there were others.