Sentences with phrase «glacial advance»

Not only did it contain nothing resembling those figures; throughout that year there was no paper published in this journal about glacial advance or retreat.....

The glacial retreat induced by this or any other process can be amplified by similar inverse positive feedbacks as for glacial advances.

However, until now, it was thought that the glaciers were only affected by events in the northern hemisphere, based on the dating of past glacial advances.

Not only did it contain nothing resembling those figures; throughout that year there was no paper published in this journal about glacial advance or retreat.....

And we see a very different pattern of glacial advances compared to North America and Europe,» Batbaatar said.

(Clearly however brief Warm periods can occur during a general glacial retreat and brief cold periods during glacial advance.)

Yet no one ever hears the argument that man might consider a deliberate increase in particulates to counter the CO2 effect or alternatively that the CO2 effect is just what is needed to prevent or delay the onset of the next glacial advance which is now imminent according to students of this problem.

E.g. an established forest that was destroyed by glacial advance about 6000 years ago and is only now being reexposed.

Dating the phases of glacial advance requires to analyze moraines, rocky debris carried along by the glacier.

The uplift occurring here is due to present - day melting of glaciers and ice fields formed during the Little Ice Age glacial advance that occurred between 1550 A.D. and 1850 A.D.»

Fox Glacier Guiding will guide you onto the ice via a secret track through bush regenerating from previous glacial advances & share with you their knowledge of the geology of the area.

Term originally introduced in the late 1930s by Matthes (1939) to describe a broad interval of the late Holocene during which significant glacial advances were observed.

At the retreat of the last glacial advance the land in North America rebounded but there were no significant volcanic eruptions because of it.

Glacial advances throughout Europe destroyed farmland and caused massive flooding.

It shows the Hockey stick paleo reconstructions - smoothed 50 year records - and decadal CET instrumental (and reconstruction) The blue lines closed at the top represent glacial retreats and closed at the bottom glacial advances.

The Earth has been in a glacial period for the last 3 million years, including some sixty separate glacial advances and retreats.

Perhaps they represent glacial advances that overrun terminal moraines and then freeze their rock into the bottom of the ice sheet.

If the suggested glacial advances of the Little Ice Age are accurate, then it happened long before the Industrial Revolution, and so presumably had nothing to do with human CO2 emissions.

Derek J. Taylor, a member of the team, attributes the counterintuitive finding to the fact that pockets of the species were preserved in limited areas that remained ice - free during glacial advances.

Evidence of past glacial advance and retreat is also more easily observed in the Dry Valleys, providing a window into the past behavior of the vast Antarctic ice sheets and their influence on global sea levels.

This is because terrestrial deposits of ancient glacial and interglacial periods1 — 3 are overrun and eroded by more recent glacial advances, and are therefore usually rare, isolated and poorly dated.

Glaciation in Alaska's Chugach Range began 5 million years ago with glacial advance and retreat that has shaped the dramatic landscape.

From the onset of northern - hemisphere glaciation (about 3 million years ago) to the «mid-Pleistocene transition» (about 800,000 years ago), glacial advance and retreat follows a strong 41,000 - year cycle, which has led to its being called «the 41 ky world» (Raymo & Nisancioglu 2003, Paleoceanography, 18, 1011).

Samples of gas trapped in ice cores taken from the Greenland and Antarctic ice sheets have enabled scientists to determine that the level of CO2 in the atmosphere has fluctuated between approximately 180 ppm (glacial advance and colder climate in the higher latitudes) and 280 ppm (glacial retreat and warmer climate in the higher latitudes), over the past 400,000 or more years.

The glacial advance is long and with many fluctuations, but when it bottoms out at maximum glacial advance, the reversal is much, much quicker and with fewer and smaller fluctuations.

During the glacial advance part of the charts, the lines of temps decline like stair steps in tandem with the decline in CO2 concentrations.

You can find measurements of glacial advance and retreat, and of ice forming and breaking up off Alaska.

Just in the last 650,000 years there have been seven cycles of glacial advance and retreat, with the abrupt end of the last ice age about 7,000 years ago marking the beginning of the modern climate era — and of human civilization.