Sentences with phrase «during the last ice age as»

during the last ice age as evidence that 3.7 w / m2 for CO2 x 2 will produce 3C of warming.

Not exact matches

Previous research suggests that, during the last ice age (which ended around 11,700 years ago), humans moved into the Americas from Asia across what was then a land bridge to North America, eventually reaching what is now the west coast of British Columbia, Canada as well as coastal regions to the south.

The research takes as its desired stable state the Holocene epoch, the 10,000 years since the last ice age during which human civilization has flourished, and attempts to identify the key variables that might push planetary cycles past safe thresholds.

This is because the campaign's seafloor survey revealed features under the ocean, such as troughs cut by glaciers during the last ice age, which must continue upstream under the glacial ice.

During the last ice age, much of North America was covered by a giant ice sheet that many scientists believe underwent several catastrophic collapses, causing huge icebergs to enter the North Atlantic — phenomena known as Heinrich events.

«The recent research findings show that during the last Ice Age, mammoths were the most widely distributed large mammals, thus rightfully serving as a flagship species of the glacial era,» according to Prof. Dr. Ralf - Dietrich Kahlke, an Ice Age researcher at the Senckenberg Research Station for Quaternary Paleontology in Weimar.

It was formed as a limestone cave system during the last ice age when sea levels were much lower.

As sea levels rose during the last Ice Age, the cave flooded and its roof collapsed into this sinkhole resulting in a marine wonder known for its sparkling blue waters, wealth of coral formations, sharks and fish, and deep caves filled with stalactites.

On the way, our dive guide Anna recounted the history of this iconic site, which originated as a limestone cave during the last ice age.

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.

The expansion of sea ice during the last ice age acted as a «lid» on the Southern Ocean, preventing CO2 from escaping.

As during the last ice age when sea levels were around 100 m lower icebergs were grounding at 44s, these would have calved from similar size as during the 2001 event (160kmx30km) hardly evidence of changAs during the last ice age when sea levels were around 100 m lower icebergs were grounding at 44s, these would have calved from similar size as during the 2001 event (160kmx30km) hardly evidence of changas during the 2001 event (160kmx30km) hardly evidence of change.

Similarly, during the Little Ice Age between 1300 and 1850 AD, montane glaciers as well as Greenland and Antarctic ice sheets, grew and reached their largest extent in the last 7,000 yeaIce Age between 1300 and 1850 AD, montane glaciers as well as Greenland and Antarctic ice sheets, grew and reached their largest extent in the last 7,000 yeaice sheets, grew and reached their largest extent in the last 7,000 years.

During the last ice age much of the northern hemisphere was covered in ice and glaciers, and, as this map from the University of Arizona shows, they covered nearly all of Canada, much of northern Asia and Europe, and extended well into the United States.»]

''... worked with two sediment cores they extracted from the seabed of the eastern Norwegian Sea, developing a 1000 - year proxy temperature record «based on measurements of δ18O in Neogloboquadrina pachyderma, a planktonic foraminifer that calcifies at relatively shallow depths within the Atlantic waters of the eastern Norwegian Sea during late summer,» which they compared with the temporal histories of various proxies of concomitant solar activity... This work revealed, as the seven scientists describe it, that «the lowest isotope values (highest temperatures) of the last millennium are seen ~ 1100 - 1300 A.D., during the Medieval Climate Anomaly, and again after ~ 1950 A.D.» In between these two warm intervals, of course, were the colder temperatures of the Little Ice Age, when oscillatory thermal minima occurred at the times of the Dalton, Maunder, Sporer and Wolf solar minima, such that the δ18O proxy record of near - surface water temperature was found to be «robustly and near - synchronously correlated with various proxies of solar variability spanning the last millennium,» with decade - to century - scale temperature variability of 1 to 2 °C magnitude.»

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

The research also shows that the swings in Pacific temperatures tend to increase in warmer times — like now — but weakened by as much as 50 percent during the protracted cold of the last ice age.

Concerns about the origin of melt water pulse 1A during the end of the last ice age led to investigation of large Antarctic melt pulses as a potential source.

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).

There is ample circumstantial evidence that it has a significant impact, such as the Little Ice Age that occurred during the last grand minimum, as well as the unusually cold climates that also matched past weak cycles, now, and also in the early 19th and 20th centuries.

To see how fast sea level may rise in the future, Carlson and his team looked to the ancient Laurentide ice sheet, which stretched as far south as Ohio and New York City during at the peak of the last Ice Age 20,000 years aice sheet, which stretched as far south as Ohio and New York City during at the peak of the last Ice Age 20,000 years aIce Age 20,000 years ago.

Responding to and in the manner of KK Tung's UPDATE (and, you can quote me): globally speaking the slowing of the rapidity of the warming, were it absent an enhanced hiatus compared to prior hiatuses, must at the least be interpreted as nothing more than a slowdown of the positive trend of uninterrupted global warming coming out of the Little Ice Age that has been «juiced» by AGW as evidenced by rapid warming during the last three decades of the 20th Century, irrespective of the fact that, «the modern Grand maximum (which occurred during solar cycles 19 — 23, i.e., 1950 - 2009),» according to Ilya Usoskin, «was a rare or even unique event, in both magnitude and duration, in the past three millennia [that's, 3,000 years].»

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.

Sea level has risen as the vast continental glaciers formed during the last ice age melted.

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.

And many solar scientists are now predicting a much quieter sun in our very near future, some suggest as quiet as during the last little ice age.

When the last ice age ended, the oceans were very close to 120 m (nearly 400 feet) LOWER than today (NASA's own website) As for runaway GHG induced heat, at the hight of our present right now, sea levels are STILL 4 - 6 meters LOWER than they wrre during the previous interglacial.

In fact, if humankind was really as dumb as the fans of DPS would have us believe, we wouldn't be around today to hear their doomsaying, because Homo sapiens would have been wiped out during vastly larger environmental swings (in and out of ice ages, for example) in our past, than those expected as a consequence of the burning of fossil fuels to produce the energy that powers our world — a world in which the human life expectancy, perhaps the best measure of our level of «dumbness» or «smartness» — has more than doubled over the last century and continues to grow ever longer.

Long considered to be the planet's ultimate safety valve for excess carbon dioxide - drawing down close to 25 % of all anthropogenic emissions - the oceans may not prove as effective at storing the greenhouse gas as they did during the last ice age,

During the last ice age, a mile - high North American ice sheet, that stretched as far south as Long Island, N.Y., piled so much weight on the Earth that underlying mantle rock flowed slowly outward, away from the ice.

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.

«The crater area was covered by a thick ice sheet during the last ice age, much as West Antarctica is today.

Foraminifera - bound δ15N is up to 2 ‰ lower during the last ice age than during the Holocene, suggesting as much as ~ 25 % less complete nitrate consumption during the former.