Sentences with phrase «recent glacial periods»

Since then, atmospheric CO2 declined as the Indian and Atlantic Oceans have been major depocentres for carbonate and organic sediments while subduction of carbonate - rich crust has been limited mainly to small regions near Indonesia and Central America [10], thus allowing CO2 to decline to levels as low as 170 ppm during recent glacial periods [11].

-- Gleick It's my understanding that the White Earth is colder than the recent glacial periods.

For the most recent glacial periods ice cores provide climate proxies from their ice, and atmospheric samples from included bubbles of air.

Cave Bears (Ursus spelaeus) lived in Europe during the most recent glacial period, approximately 400,000 years ago, until they became extinct about 25,000 years ago.

The most recent glacial period, for example, occurred from roughly 90,000 years ago until 15,000 years ago, and Homo sapiens who had mastered the widespread use of fire were around for the entire duration.

Due largely to the discovery of stalactites in the underwater caves found in the Belize Barrier Reef, geologists have discovered that the Belize Barrier Reef was not created by volcanic activity (as many reefs are) but instead by the most recent glacial period instead.

The most recent glacial period peaked 21,500 years ago during the Last Glacial Maximum, or LGM.

Not exact matches

These may be submerged ancient shorelines cut during times of lower sea level, «the most recent of which occurred during the last glacial period, which ended about 19,000 years ago,» Chaytor said.

A prehistoric human skeleton found on the Yucatán Peninsula is at least 13,000 years old and most likely dates from a glacial period at the end of the most recent ice age, the late Pleistocene.

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.

The first one (around 50,000 — 200,000 years ago) colonised the Eastern Mediterranean, and in the second, much more recent (after the last glacial period), the species colonised Southern Italy, particularly Calabria.

For example, atmospheric carbon dioxide grew by approximately 30 % during the transition from the most recent cold glacial period, about 20,000 years ago, to the current warm interglacial period; the corresponding rate of decrease in surface ocean pH, driven by geological processes, was approximately 50 times slower than the current rate driven largely by fossil fuel burning.

«The question is again being discussed whether recent and long - continued observations do not point to the advent of a second glacial period, when the countries now basking in the fostering warmth of a tropical sun will ultimately give way to the perennial frost and snow of the polar regions.»

Most important was a widely noted paper by Ewing and William Donn, who were «stimulated by the observation that the change in climate which occurred at the close of the [most recent] glacial period was extremely abrupt.»

Similarly, in a study of air temperature and CO2 data obtained from Dome Concordia, Antarctica for the period 22,000 - 9,000 BP — which time interval includes the most recent glacial - to - interglacial transition — Monnin et al. (2001) found that the start of the CO2 increase lagged the start of the temperature increase by 800 years.

As the worlds» oldest and most scrutinised instrumental temperature record it usefully covers much of the «Little Ice Age» when the most extensive recent glacial advances in the Holocene began, whilst numerous contemporary records make it possible to examine earlier periods in British climatic history.

Establishing the role of carbon dioxide (CO2), both as a feedback and forcing, during the most recent glacial and deglacial periods provides an excellent opportunity for understanding how this connection operates.

The largest global - scale climate variations in Earth's recent geological past are the ice age cycles (see Learn about... the ice ages), which are cold glacial periods followed by shorter warm periods (see Figure 3).

If recent warm periods (or interglacials) are a guide, then we may soon slip into another glacial period.

Observations of recent global warming, short - term cooling after major volcanic eruptions, cooling at the Last Glacial Maximum and other periods in the historical record, and the seasonal variation in climate, all provide some information which helps to determine the value of climate sensitivity.

That also concurs with recent observations of a very large increase in glacial outflows from Greenland over the 2000 - 2005 period.

The glacial period that peaked 21,500 years ago was only the most recent of five glacial periods in the last 450,000 years.