Sentences with phrase «period during the last ice age»

Walter Starck noted that if only humans really were able to heat the globe, «and it helps to prevent another ice age, this would be the most fortunate thing that has happened to our species since we barely escaped extinction from an especially cold period during the last ice age some 75,000 years ago.»

Not exact matches

There is no reliable evidence of modern humans elsewhere in the Old World until 60,000 - 40,000 years ago, during a short temperate period in the midst of the last ice age.

Great flood: the filly of a large basin by raising oceans during the warming period after the last ice age.

The data showed that, in comparison to today, the Atlantic Ocean surface circulation was much weaker during the Little Ice Age, a cool period thought to be triggered by volcanic activity that lasted from 1450 - 1850.

Scientists from Rice University and Texas A&M University - Corpus Christi's Harte Research Institute for Gulf of Mexico Studies have discovered that Earth's sea level did not rise steadily but rather in sharp, punctuated bursts when the planet's glaciers melted during the period of global warming at the close of the last ice age.

They dated a subset of the bryophytes and found that the plants ranged in age from 404 to 614 years old, confirming that were frozen during the Little Ice Age, a period of cooling lasting a few hundred years, which ended in the 19th centuage from 404 to 614 years old, confirming that were frozen during the Little Ice Age, a period of cooling lasting a few hundred years, which ended in the 19th centuAge, a period of cooling lasting a few hundred years, which ended in the 19th century.

And in many places, it's moving faster than the ice is thought to have retreated during the warming period at the end of the last ice age, around 20,000 years ago.

For example, the ice ages during the last several million years — and the warmer periods in between — appear to have been triggered by no more than a different seasonal and latitudinal distribution of the solar energy absorbed by the Earth, not by a change in output from the sun.

The warm Atlantic water continued to flow into the icy Nordic seas during the coldest periods of the last Ice Age.

«It is widely thought that during cold periods of the last Ice Age the warm Atlantic water had stopped its flow into the Nordic Seas.

The experiment simulated conditions believed to be the cause of the beveling — the most recent episode of which occurred during the period of deglaciation following the last Ice Age, about 18,000 years ago.

But during a period of several thousand years up until the last ice age ended approximately 12,000 years ago, this pattern did not fit and this was a mystery to researchers.

During the last 800,000 years, CO2 fluctuated between about 180 ppm during ice ages and 280 ppm during interglacial warm peDuring the last 800,000 years, CO2 fluctuated between about 180 ppm during ice ages and 280 ppm during interglacial warm peduring ice ages and 280 ppm during interglacial warm peduring interglacial warm periods.

However, in periods in the past, say around 8,200 years ago, or during the last ice age, there is lots of evidence that this circulation was greatly reduced, possibly as a function of surface freshwater forcing from large lake collapses or from the ice sheets.

He completely dismisses all other explanations for the ice - age - periods during the last half billion years than the passing of our solar system through areas with higher production of cosmic rays when it rotates around the center of our galaxy.

The Mann reconstruction appears much flatter than other reconstructions before 1900, and it seems that NAS see pretty good evidence for a «Little Ice Age» and reasonable evidence for a «Medieval Warm Period» (though they think it's plausible that the last 25 years were warmer than any comparable period during the last 1100 yPeriod» (though they think it's plausible that the last 25 years were warmer than any comparable period during the last 1100 yperiod during the last 1100 years).

The Last Glacial Maximum is a period when ice sheets during the last northern hemisphere ice age were at their highest extLast Glacial Maximum is a period when ice sheets during the last northern hemisphere ice age were at their highest extlast northern hemisphere ice age were at their highest extent.

Maximum efficiency is reached during the «Little Ice Age» with clustered events probably lasting several days, but major storms also occurred immediately prior to the «Medieval Warm Period».

During the Earth's ice ages the Pacific Ocean stored large amounts of carbon, which for some reason it released again close to the last glacial period's end, warming the world and melting most of the icecaps.

The AMO during the Little Ice Age was characterized by a quasi-periodicity of about 20 years, while the during the Medieval Warm Period the AMO oscillated with a period of about 45 to 65 years... The observed intermittency of these modes over the last 4000 years supports the view that these are internal ocean - atmosphere modes, with little or no external forcing... However, the geographic variability of these periodicities indicated by ice core data is not captured in model simulations.&raqIce Age was characterized by a quasi-periodicity of about 20 years, while the during the Medieval Warm Period the AMO oscillated with a period of about 45 to 65 years... The observed intermittency of these modes over the last 4000 years supports the view that these are internal ocean - atmosphere modes, with little or no external forcing... However, the geographic variability of these periodicities indicated by ice core data is not captured in model simulations.&Period the AMO oscillated with a period of about 45 to 65 years... The observed intermittency of these modes over the last 4000 years supports the view that these are internal ocean - atmosphere modes, with little or no external forcing... However, the geographic variability of these periodicities indicated by ice core data is not captured in model simulations.&period of about 45 to 65 years... The observed intermittency of these modes over the last 4000 years supports the view that these are internal ocean - atmosphere modes, with little or no external forcing... However, the geographic variability of these periodicities indicated by ice core data is not captured in model simulations.&raqice core data is not captured in model simulations.»

What you see in the geological record is our planet has a constantly varying climate — in recent times during the Pleistocene Era (the last 2.65 million years), we have long ice ages interspersed with relatively short (10 - 20,000 years) interglacial periods.

For roughly the past 10,000 years, since the end of the last Ice Age, human beings have enjoyed a relatively stable, comfortable «interglacial» period, during which they've invented everything from agriculture to moon rockets.

The last time the Earth significantly cooled was during the 14th to 19th centuries â $» a period known as the Little Ice Age.

Modern Homo sapiens had probably been in Africa during the last warm period in the ice ages, which started 130,000 years ago (this is when you see the first use of fireplaces as a centrally - located feature of encampments, suggesting some change in social organization).

The ubiquitous character of certain events further confirms their importance: «the Younger Dryas and a large number of abrupt changes during the last ice age called Dansgaard / Oeschger events (23 abrupt changes into a climate of near - modern warmth and out again, during the last glacial period) have been corroborated in multiple ice cores from Greenland, Antarctica and tropical mountains, marine sediments from the North Atlantic Ocean, the tropical Atlantic, eastern Pacific, and Indian Oceans, and from various records on land.

It has been warmer than the present for much of the ten thousand years since the last big ice age: it was a little warmer for a few centuries in the medieval warm period around 1100 (when Greenland was settled for grazing) and also during the Roman - Climate Optimum at the time of the Roman Empire (when grapes grew in Scotland), and at least 1 °C warmer for much of the Holocene Climate Optimum (four to eight thousand years ago).

«All 18 periods of significant climate changes found during the last 7,500 years were entirely caused by corresponding quasi-bicentennial variations of [total solar irradiance] together with the subsequent feedback effects, which always control and totally determine cyclic mechanism of climatic changes from global warming to Little Ice Age.»

Earth has experienced extended periods of cooling due to more frequent explosive volcanic eruptions and periods of few sunspots — such as during the «Little Ice Age» which lasted roughly from 1300 to the 1800s.

After freezing over regularly during the Little Ice Age the River Thames froze for the last time in 1814, as the Earth moved into what might be called the Modern Warm Period.

Here, we argue that the twentieth and twenty - first centuries, a period during which the overwhelming majority of human - caused carbon emissions are likely to occur, need to be placed into a long - term context that includes the past 20 millennia, when the last Ice Age ended and human civilization developed, and the next ten millennia, over which time the projected impacts of anthropogenic climate change will grow and persist.

Thus, the Norse reached Greenland during a period good for growing hay and pasturing animals... Around 1300, though, the climate in the North Atlantic began to get cooler and more variable from year to year, ushering in a cold period termed the Little Ice Age that lasted into the 1800s.

Well - documented climate changes during the history of Earth, especially the changes between the last major ice age (20,000 years ago) and the current warm period, imply that the climate sensitivity is near the 3 °C value.

A barrage of comets could most certainly change climate trends and during a different time period like the last ice age could certainly have a different degree of climate sensitivity.

Argues that the twentieth and twenty - first centuries, a period during which the overwhelming majority of human - caused carbon emissions are likely to occur, need to be placed into a long - term context that includes the past 20 millennia, when the last Ice Age ended and human civilization developed, and the next ten millennia, over which time the projected impacts of anthropogenic climate change will grow and persist

The Earth must be in radiative (energy) balance within a very small fraction of 1 W / m2 averaged over the current interglacial period as well as during the peak of the last ice age 20,000 years ago.