Sentences with phrase «last glacial maximum»

«A Global Perspective on Last Glacial Maximum to Holocene Climate Change.»

Distinguishing subglacial till and glacial marine diamictons in the western Ross Sea, Antarctica: Implications for last glacial maximum grounding line.

(4) From the above post: «Annan and Hargreaves (2006) used a Bayesian statistical approach that combines information from both 20th century observations and from last glacial maximum data to produce an estimate of climate sensitivity that is much better constrained than by either set of observations alone.»

Reliance can not be placed on paleoclimate proxy - based estimates of ECS — the AR4 WG1 report concluded (Box 10.2) that uncertainties in Last Glacial Maximum studies are just too great, and the only probability density function (PDF) for ECS it gave from a last millennium proxy - based study contained little information.

Sea - surface temperature and sea ice distribution of the Southern Ocean at the EPILOG Last Glacial Maximum — a circum - Antarctic view based on siliceous microfossil records

[2] The only current ice sheets are in Antarctica and Greenland; during the last glacial period at Last Glacial Maximum (LGM) the Laurentide ice sheet covered much of North America, the Weichselian ice sheet covered northern Europe and the Patagonian Ice Sheet covered southern South America.

[Response: The albedo change, going from last glacial maximum to present (pre-industrial time) was about 3.5 + / -1 W / m ^ 2, whereas CO2 change (including other greenhouse gases) was about 2.6 + / - 0.5), and aerosols about 0.5 + / -1.

Displacement data indicate that the Leech River fault has experienced at least two surface - rupturing earthquakes since deglaciation following the last glacial maximum ca. 15 ka.

Connections to land - based systems Hydrologists think these submarine groundwater reserves started to form tens of thousands of years ago, during periods like the Last Glacial Maximum when much of the Earth's water was bound up in ice and sea levels were especially low.

The only current ice sheets are Antarctic and Greenland; during the last ice age at Last Glacial Maximum (LGM) the Laurentide ice sheet covered much of Canada and North America, the Weichselian ice sheet covered northern Europe and the Patagonian Ice Sheet covered southern South America.

The land bridge connected Siberia and North America beginning 38,000 years ago, during the Last Glacial Maximum.

But some researchers have argued that the transition from the frigid climatic period known as the Last Glacial Maximum (LGM)-- about 20,000 to 25,000 years ago — to the current warm Holocene Epoch brought habitat changes that killed off the mammoths with little or no help from humans.

Such piracy was rampant as the colossal ice sheets of the Last Glacial Maximum began shrinking around 18,000 years ago.

A 33,000 - year - old incipient dog from the Altai Mountains of Siberia: Evidence of the earliest domestication disrupted by the Last Glacial Maximum.

So we've already increased CO2 by more than from the last glacial maximum to the present interglacial.

«In fact from the end of the Last Glacial Maximum some 19,000 years ago, its genetic component reappeared in Spain.

«Challenging events such as the Last Glacial Maximum, around 20,000 years ago, do not lead to massive population replacement, but instead to a bottleneck,» he says.

The last glacial maximum was about 18,000 years ago, when the Patagonian ice sheet expands to include about 10 meters [33 feet] of global sea level.

Before the corridor closed, prior to the last glacial maximum, they moved freely up and down between the ice - free regions in the north and grasslands south of the ice sheets.

«Ice age bison fossils shed light on early human migrations in North America: Study dates the first movements of bison through an ice - free corridor that opened between the ice sheets after the last glacial maximum.»

The granitic bedrock here was polished by glacier sliding during the Last Glacial Maximum.

Following the Last Glacial Maximum, species seemed to die off en masse in regions experiencing rapid shifts in temperatures (shown in yellow and red), but they held on in many hilly regions like the Andes (inset).

To get an idea of how such a mass migration may decide the fate of the world's diverse fauna, researchers turned the clock back to the Last Glacial Maximum.

To begin with, the climate is warming much faster today than it ever did following the Last Glacial Maximum.

Neanderthals, with whom we shared the planet until just before the last glacial maximum, 20,000 years ago, may have struggled to survive as the rising and falling ice ate away at their habitat — although many other explanations for their extinction have been suggested.

Drawing on recent findings from archaeology, genetics, and the environmental sciences, the author provides a region - by - region account of the transformations of human populations in the 15 millennia following the Last Glacial Maximum.

Nearly 21,000 years ago, during what scientists call the Last Glacial Maximum, thick ice tracts swaddled much of North America and Europe.

A «good» place to live About 25,000 years ago, the Earth entered what is known as the Last Glacial Maximum (LGM), a period of climate change that caused temperatures to drop and glacial masses to expand, O'Rourke said.

The last glacial maximum was a time when Earth's far northern and far southern latitudes were largely covered in ice sheets and sea levels were low.

Lemdubuoryctes also did not live in a primordial rainforest, but rather a vast savannah plain that stretched between Australia and New Guinea during the last glacial maximum.

«Previously, people believe the last glacial maximum was somewhere in the range of 19 - 23,000 years ago,» Willenbring said.

When melting outpaces snow accumulation, as happened after the last glacial maximum, the surface mass balance is negative.

As elsewhere on the planet, tropical glaciers (located on either side of the equator between 23 ° N and 23 ° S) have been retreating since the Last Glacial Maximum around 20,000 years ago.

The sediment cores used in this study cover a period when the planet went through many climate cycles driven by variations in Earth's orbit, from extreme glacial periods such as the Last Glacial Maximum about 20,000 years ago, when massive ice sheets covered the northern parts of Europe and North America, to relatively warm interglacial periods with climates more like today's.

Future studies with more samples from around the time of the Last Glacial Maximum, they say, should help clarify the course of extinction events.

Bar - Yosef points out that, at the time, Earth was in the clutches of the Last Glacial Maximum, the height of the last ice age.

«But also what the connections between areas were during the Last Glacial Maximum, which is when the sea levels were very low.»

During the Last Glacial Maximum when the Earth was much colder, closed - basin lakes in currently dry parts of western North America, the Middle East and South America were much larger than they are now, as evidenced by radiocarbon dating and other testing of their ancient shorelines.

The discovery that the oldest pots in the world were made in China around the time of the Last Glacial Maximum suggests that might be the case.

During the Last Glacial Maximum in the Pleistocene Epoch, approximately 26,000 years ago, many areas and islands in Asia were connected.

«Interestingly, the past land connections during the Last Glacial Maximum are more important in explaining the existing ant community patterns, than the way land is configured now,» Wepfer said.