Sentences with phrase «ice age period»

Relevant information regarding its value comes from observations of past climates (including the ice age period) and from model simulations.

The current rate of ocean heat uptake is perfectly consistent with that theory and recovery from a little ice age period as far as ocean heat content goes.

Based on the cycle, it would suggest that we are heading into another Ice Age period of cooling where global temperatures will drop and ice will again form heavily at the poles.

Considering Europe was in the last Ice Age period, its harsh climate rendered it generally inhospitable, so humans from the Levant moved first to Asia, and only later (45,000 ago) to Europe.

Scientists believe they have discovered the reason behind mysterious changes to the climate that saw temperatures fluctuate by up to 15 °C within just a few decades during the ice age periods.

The causes of ice ages remain controversial for both the large - scale ice age periods and the smaller ebb and flow of glacial — interglacial periods within an ice age.

There is little relationship between CO2 and temperature over ice age periods.

Not exact matches

«While the specific cover is fake, it is true there was a period in the»70s when people were predicting an ice age,» the official said.

There was no explanation of why both the medieval warm period and the little ice age, very clearly shown in the 1990 report, had simply disappeared eleven years later.

The March 12, 2015 issue of Nature magazine contains an essay — not an original thesis, rather a summation — by two English geographers entitled «Defining the Anthropocene,» the subject of which is whether (and starting when) human activity has so altered the global environment as to constitute a new geologic age: the Anthropocene Age, as successor to the 11,000 - year Holocene Epoch that is itself part of the larger 2.6 million year - old Quaternary Period (or Great Ice Agage: the Anthropocene Age, as successor to the 11,000 - year Holocene Epoch that is itself part of the larger 2.6 million year - old Quaternary Period (or Great Ice AgAge, as successor to the 11,000 - year Holocene Epoch that is itself part of the larger 2.6 million year - old Quaternary Period (or Great Ice AgeAge).

This warm period was followed by the «little ice age» when the Thames would frequently freeze over during the winter.

There is no evidence for significant increase of CO2 in the medieval warm period, nor for a significant decrease at the time of the subsequent little ice age.

ice ages followed by hot periods.

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.

We had a Midevil warm period and a mini ice age that ended in the 1700's.

While Reinl believes that the «ice age is over,» the article, to its credit, goes on to present the other side of the debate, quoting a number of athletic trainers, and an orthopedic surgeon, as still believing in the value of ice, especially in the period immediately after injury, in order to reduce acute - injury bleeding, relieve post-activity soreness, and for pain relief.

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.

The researchers studied temperature measurements over the last 150 years, ice core data from Greenland from the interglacial period 12,000 years ago, for the ice age 120,000 years ago, ice core data from Antarctica, which goes back 800,000 years, as well as data from ocean sediment cores going back 5 million years.

Astronomical factors also play a role in relation to the great changes like the shift between ice ages, which typically lasts about 100,000 years and interglacial periods, which typically last about 10 - 12,000 years.

The Earth's axis fluctuates between having a tilt of 22 degrees and 24 degrees and when the tilt is 24 degrees, there is a larger difference between summer and winter and this has an influence on the violent shifts in climate between ice ages and interglacial periods.

«We can see that the climate during an ice age has much greater fluctuations than the climate during an interglacial period.

For the last 2.5 million years, Earth settled into a rather unusual period of potential instability as we rocked back and forth between ice ages and intervening warm periods, or interglacials.

Also, remember that during those periods of, say, the Ice Age, there was enormous hardship.

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.

The Australian small carpenter bee populations appear to have dramatically flourished in the period of global warming following the last Ice Age some 18,000 years ago.

Today, we are in a warm period at the end of an ice age.

But during the Little Ice Age, a period from roughly 1400 to 1850 when temperatures in Europe were cooler and many of Earth's glaciers expanded, the biggest changes came from the Intertropical Convergence Zone shifting to the south.

For example, Europe's «little ice age» coincided with a period of minimal solar activity between 1640 and 1710.

Heavier rainfall at the study sites from the year 0 to 400, and again during Europe's Medieval Warm Period, just before the Little Ice Age from about the year 800 to 1300, was probably caused by a centuries - long strengthening of El Niño.

Its peak extent came in a warm period before the last ice age.

These big ice sheets have frozen and melted many times in the past (producing ice ages with low sea levels and warm periods with high sea levels).

What happens when the world moves into a warm, interglacial period isn't certain, but in 2009, a paper published in Science by researchers found that upwelling in the Southern Ocean increased as the last ice age waned, correlated to a rapid rise in atmospheric carbon dioxide.

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.

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.

During the warm periods between recent ice ages, temperatures in Antarctica reached substantially higher levels than scientists had previously thought.

The new projections are based on leading research into contemporary and historical climate data, but also new scientific reconstructions of the only comparable period in human history: the last Ice Age.

«Prior to the last Ice Age, there was a clear distinction in the isotope values for all three species; after this period, there is a clear overlap — and this suggests that the habitat of deer species had shrunk or there was and overlap in the diets of the different deer species,» says Dorothée Drucker from the Biogeology department, who examined the collagen.

«It would produce a climate change unknown in recorded history — colder than the little ice age,» Robock says, referring to the period between the 14th and 19th centuries when a 1.5 °F drop below today's temperatures caused crop failures, famines, and political unrest in northern Europe.

In contrast, in slightly wetter parts of Mongolia the largest glaciers did date from the ice age but reached their maximum lengths tens of thousands of years earlier in the glacial period rather than at its culmination, around 20,000 years ago, when glaciers around most of the planet peaked.

The study covers a period that begins at the end of the Ice Age and when there still was an ice sheet covering Canada, Shuman saIce Age and when there still was an ice sheet covering Canada, Shuman saice sheet covering Canada, Shuman says.

Soon and Baliunas are «mindful» that the Medieval Warming Period and the Little Ice Age should be defined by temperature, but «we emphasize that great bias would result if those thermal anomalies were to be dissociated» from other climatic conditions.

In contrast, the consensus view among paleoclimatologists is that the Medieval Warming Period was a regional phenomenon, that the worldwide nature of the Little Ice Age is open to question and that the late 20th century saw the most extreme global average temperatures.

The most significant criticism is that Soon and Baliunas do not present their data quantitatively — instead they merely categorize the work of others primarily into one of two sets: either supporting or not supporting their particular definitions of a Medieval Warming Period or Little Ice Age.

This period coincides with the height of a time known as the Little Ice Age, which was a period of lower temperatures in Europe and perhaps globally.

Usually, it's a minor annoyance, but as a global cooling period known as the «little ice age» took hold in the 16th and 17th centuries, the sandstorms were unusually fierce.

They said that two extreme climate periods — the Medieval Warming Period between 800 and 1300 and the Little Ice Age of 1300 to 1900 — occurred worldwide, at a time before industrial emissions of greenhouse gases became abundant.

Gard found similar fossils deeper down in the sediment cores, indicating that the Arctic ice partially cleared at various times from about 128 000 to 71 000 years ago — a period covering the latest interglacial and the early part of the latest ice age.