Sentences with phrase «of glacial advances»

If water (rain, clouds, oceans) is the stabilizer, then it should overwhelm any warming by trace gases, albedo effects of glacial advances and retreats, etc..

Walt, if you've ever studied Pleistocene geology and the million year history of glacial advances and interglacial warming cycles you would know human - induced global warming and climate changes are the dominant cause of current and future catastrophic consequences.

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

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

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.

The data shows that we are headed in the exact opposite direction of any glacial advance.

Not exact matches

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.

Using a modern version of the Hexagon satellite called the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), the team screened 2276 large glacial lakes in the Himalayas and found that 49 of them have potential flood volumes of over 10 million cubic meters, which are generally considered to be major floods.

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.

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).

Evidence from glacial advance / retreat (e.g. the evidence from tropical Andean glaciers you cite above) is often difficult to interpret, because glacial mass balance represents in general a subtle competition between the influences of ablation (determined by changes in temperature thresholds reached) and accumulation (determined by changes in humidity and precipitation).

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.

But the main glacial region will still be white as long as it is stable or advancing and snow falls over a long enough period of the year.

Since then, the world has seen cycles of glaciation with ice sheets advancing and retreating on 40,000 - and 100,000 - year time scales called glacials (glacial advance) and interglacials (glacial retreat).

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.

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.

No one needs advanced math to understand what is going on when hundreds of supra - glacial lakes appear when before there were none.

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.

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

Indeed, pervious studies have tied increases in the C14 in tree rings, and hence reduced solar irradiance, to Holocene glacial advances in Scandinavia, expansions of the Holocene Polar Atmosphere circulation in Greenland; and abrupt cooling in the Netherlands about 2700 years ago... Well dated, high resolution measurements of O18 in stalagmite from Oman document five periods of reduced rainfall centered at times of strong solar minima at 6300, 7400, 8300, 9000, and 9500 years ago.»

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Measured rates of rise and measured glacial advance continue to suggest a modest rate of raise over the next 90 years.

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

What is known is that during the period called Little Ice Age, global glacial were advancing, and starting around 1850, instead advancing global glacier became retreating, this trend of glacial retreat continues to the present time, but not all glaciers adding during the Little Ice Age have not yet melted.

Earlier than that, we know that human migration out of Africa and population were set back during glacials and advanced during stadials.

I used to illicit gales of laughter when I quoted (in translation, and in my best Sesame Street Swedish Chef voice) dated documents about destitute farmers overwhelmed by the glacial advance who were seeking parish aid.

In 1999, the year after the high temperatures of the 1998 El Nino, I became convinced that geologic data of recurring climatic cycles (ice core isotopes, glacial advances and retreats, and sun spot minima) showed conclusively that we were headed for several decades of global cooling and presented a paper to that effect (Fig. 5).

It was a surprise when evidence turned up, around the end of the 19th century, that the recent glacial epoch had been made up of several cycles of advance and retreat of ice sheets — not a uniform Ice Age but a series of ice ages.

Similarly, working within the historic framework I have all sorts of other checks and balances, for example glacial advances and retreats, crop records, sea levels etc all make it difficult for me to claim black is white as the evidence is available to disprove me.

A closed blue horizontal line at the top of the graph equates to a period of glacial retreat (warmth) and a closed blue line at foot of graph demonstrates glacier advance (cold)

As the worlds» oldest and most scrutinised instrumental temperature record it usefully covers much of the «Little Ice Age» when the most extensive recent glacial advances in the Holocene began, whilst numerous contemporary records make it possible to examine earlier periods in British climatic history.

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It thinned the species quite a bit — but again, that thinning was not from the glacial advance per se, which had already commenced for several thousands of years.

There is some thought that this interglacial might be one of the longer ones (naturally), and thus many thousands of years away from the next glacial advance.

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.

But the main glacial region will still be white as long as it is stable or advancing and snow falls over a long enough period of the year.

Data from modern ice stream beds are difficult to obtain, but where ice advanced onto continental shelves during glacial periods, extensive areas of the former bed can be imaged using modern swath sonar tools.

The observed effects of cryosphere reduction include modification of river regimes due to enhanced glacial melt, snowmelt advance and enhanced winter base flow; formation of thermokarst terrain and disappearance of surface lakes in thawing permafrost; decrease in potential travel days of vehicles over frozen roads in the Arctic; enhanced potential for glacier hazards and slope instability due to mechanical weakening driven by ice and permafrost melting; regional ocean freshening; sea - level rise due to glacier and ice sheet shrinkage; biotic colonisation and faunal changes in deglaciated terrain; changes in freshwater and marine ecosystems affected by lake - ice and sea - ice reduction; changes in livelihoods; reduced tourism activities related to skiing, ice climbing and scenic activities in cryospheric areas affected by degradation; and increased ease of ship transportation in the Arctic.

The report, the most precise yet thanks to advances in scientific monitoring, confirms that climate change impacts are outpacing previous projections for ocean warming, the rate of glacial ice melt in the arctic, and sea level rise.