Sentences with phrase «for glacier retreat»

Of course, other reasons could exist for glacier retreat (e.g. Kilimanjaro's glacier retreat is apparently due not to increased temperatures but rather to decreased participation — and perhaps human clearing of trees has a role in that!)

He says: «However, as far as the mid-19th century is concerned, forcings due to GHG concentrations are insignificant so we are only left with natural forcings (or causes) as an explanation for glacier retreat.»

However, as far as the mid-19th century is concerned, forcings due to GHG concentrations are insignificant so we are only left with natural forcings (or causes) as an explanation for glacier retreat.

He says: «However, as far as the mid-19th century is concerned, forcings due to GHG concentrations are insignificant so we are only left with natural forcings (or causes) as an explanation for glacier retreat.»

Not exact matches

«There's no question that as glaciers retreat, more ground will become available for exploration and more discoveries could be made in that part of the world,» said Fronk.

At Pine Island Glacier, for instance — one of West Antarctica's largest glaciers, and previously one of its fastest retreating spots — the research suggests that the grounding line has recently stabilized.

But the need for pigment to provide this extra protection waned as modern human populations migrated northward over the past 60,000 years or so, while the need to absorb UVB light became greater, particularly for those humans who migrated to the far North behind retreating glaciers less than 10,000 years ago.

But the need for pigment to provide this extra protection waned as modern human populations migrated northward over the past 60,000 years or so, Elias said, while the need to absorb UVB light became greater, particularly for those humans who migrated to the far North behind retreating glaciers less than 10,000 years ago.

Recent research has fingered the ocean as a trigger for tidewater glacier retreats.

The cave system had been sealed for hundreds of thousands of years, but an opening called the Aach spring made it accessible when Alpine glaciers retreated northward around 16,000 to 20,000 years ago.

Geologists had predicted the plunge for weeks, citing the retreat of an underlying glacier that had held the rock in place.

By 1900, increased emissions of soot could have triggered the loss of more than 15 m of ice from a glacier's surface; by 1930, the loss could have totaled 30 m or more — magnitudes and timing that can easily account for the Alpine glacial retreat, the scientists contend.

«It means that these animals were here before the glaciers covered central Iowa, and that they returned for a short time after the glaciers retreated as well,» Hill said.

And, worryingly, the research suggests that as these glaciers melt and retreat backward, the shape of the seabed will continue to expose many of them to warm ocean water for hundreds of miles as the ice moves inland.

A downward slope, for instance, might cause the glacier to retreat more quickly, while ridges or other topographical features might help to slow or halt the backward motion.

For comparison, one of the fastest moving glaciers, the Jakobshavn ice stream in southwest Greenland, has retreated 35 kilometers (21.7 miles) over the last 150 years.

For a pair of recent studies, UCI and NASA JPL scientists examined three neighboring glaciers in West Antarctica that are melting and retreating at different rates.

«These glaciers will keep retreating for decades and even centuries to come and we can't stop it,» said lead study author Eric Rignot, a glaciologist at the University of California, Irvine, and NASA's Jet Propulsion Laboratory in Pasadena, Calif. «A large sector of the West Antarctic Ice Sheet has passed the point of no return.»

From satellite observations such as radar interferometry, Rignot and his colleagues conclude a common cause underlies the retreat of West Antarctica's largest glaciers, including Pine Island Glacier, known for cleaving massive icebergs, and its neighbor, Thwaites Glacier.

A new study has found for the first time that ocean warming is the primary cause of retreat of glaciers on the western Antarctic Peninsula.

I seem also to remember a comment by Bindschadler stating that while GIS glaciers could retreat inland from warming oceans, there could be no similar escape for Antatctica.

Analysis of the data reveals that 87 % of glaciers have retreated (click on the image for a more detailed figure) and that the change from advance to retreat has occurred progressively with latitude.

Although scientists have known for decades that Qori Kalis and the other Quelccaya glaciers are melting, new observations indicate that the rate of retreat is increasing, Professor Thompson said.

«This widespread retreat of mountain glaciers may be our clearest evidence of global warming as they integrate many climate variables,» Professor Thompson told the American Association for the Advancement of Science conference in San Francisco.

And given that at least some retreating glaciers reveal earlier habitations beneath (in Scandinavia for example), this is a highly legitimate question.

It has always seemed to me that the retreat of mountain glaciers around the world is one of the most compelling pieces of evidence for global warming.

Those who legitimately question the case for man - made global warming (AGW) do not question whether glacier retreat is evidence of global warming.

Scientists recognized that climate change is rapidly altering the landscape in Antarctica, particularly when it comes to glacier retreat and ice shelf collapse, so they made a pact for how they would approach research as huge chunks of ice broke off.

The first one I looked at is an «own goal» for the contrarians, as it involves Phil Jones bemoaning the discrepancy between glacier retreat in high altitudes, and comparative lack of warming in the UAH troposphere record.

As a general matter, yes, but AIUI the increasing height (depth) of the ice face is the key factor for accelerating retreat of these glaciers since it creates more surface area for the warm water to work on.

The climatic conditions that cause an advance or a retreat may be different for glaciers located in different climate regimes (see Chapter 4).

The rapid shrinkage of glaciers around the Antarctic Peninsula, coupled with the potential for ice - shelf collapse and grounding line retreat, raises concerns for the future of the West Antarctic Ice Sheet, and this is an area of urgent current research [3].

For example, scientists know that once giant glaciers begin to retreat, in some parts of the world simple geography dictates nothing can stop them from melting into the sea.

Soil and rocks on the Earth's surface reveal the advance and retreat of glaciers over the land surface, and fossilized pollen traces out rough boundaries of where the climate conditions were right for different species of plants and trees to live.

French Prime Minister Manuel Valls visited the Mer de Glace (the Sea of Ice) Friday on Mont Blanc, where the retreating glacier has been documented for more than a century, through water colors painted before the invention of the still camera, black - and - white photos depicting a then - modern steam locomotive chuffing alongside the ice and today's high - definition satellite photos.

The real shocker for me was seeing just how far these glaciers are retreating each year.

Retreat to the protected lands of Prince William Sound's calm waters and pristine glaciers, and Katmai National Park to witness the iconic grizzlies fishing for salmon, or explore the premiere marine life in the aquatics of Kenai Fjords National Park and the Inside Passage.

Similar conclusions can be made for more glaciers world - wide, where the 1940 - 1945 period shows the largest retreat.

Evidence of melting glaciers and of Spanish wine - makers having to relocate their vineyards because it is getting too warm in their current location seem to be harder for the science haters to refute (though I always seem to get the «but not all glaciers are in retreat» counter-argument).

Yet the SUV is now the scapegoat for retreating glaciers.»

Most of the field studies cited in support of the dominance of precipitation effects for East African glacier retreat only support the role of precipitation in the initial stages of the retreat, up to the early 1900's.

I seem also to remember a comment by Bindschadler stating that while GIS glaciers could retreat inland from warming oceans, there could be no similar escape for Antatctica.

Data from the tropical and subtropical Andes suggest that changes in precipitation and cloud cover in the latter portion of the 20th century are minor, and that changes in these quantities are unlikely candidates for explaining Andes glacier retreat.

If tropical glaciers continue to retreat despite an increase in precipitation, that will constitute a powerful case for the role of air temperature.

Re # 40: -LSB-... As for the 1940s, I'm not familiar with the details of GNP, but in Washington State where I live, glaciers did retreat substantially until about the 1940s, before advancing again until the late 1970s.

The retreat of many mountain glaciers in Asia is a serious issue with respect to water resources for tens of millions of people (many people, indeed).

[Response: But glacier retreat is much further along than in the 1930s (see here for instance)-- and that's the key for sea level rise.

But look at, say, Wisconsin, with many meters of loess blown there as the glaciers retreated, then populated as plants took over the area, for ten thousand years.

In general, tidal glaciers are cyclical, advancing over 1,000 years or so and then rapidly retreating for one or two centuries.

We are talking about a retreat that is unstoppable because we think we have enough evidence to say that these glaciers will keep retreating for decades and even centuries to come....