Sentences with phrase «ice melt during»

The main cause is simply global warming: as the climate has warmed there has been less ice growth during the winter and more ice melt during the summer... in the end the summer melt overtook the winter growth such that the entire ice sheet melts or breaks up during the summer months.

The main cause is simply global warming: as the climate has warmed there has been less ice growth during the winter and more ice melt during the summer.

Moss grows in the Eemian, is covered by ice during the last glacial, most of this ice melt during the Early Holocene.

Basically, my comment is that it's no surprise that there was ice melt during the height of the warming during this interglacial.

El Niño events cause increases in seasonal Arctic sea ice melt during the following summer.

Only during interglacials, like the one we are in now, does some of the sea ice melt during summer, when the top of the planet is oriented a bit more towards the Sun and receives large amounts of sunlight for several summer months.

The area of sea ice melt during 2007 - 9 was about 40 percent greater than the average prediction from I.P.C.C. AR4 climate models.

For example, the area of summer sea - ice melt during 2007 - 2009 was about 40 % greater than the average projection from the 2007 IPCC Fourth Assessment Report.

Supraglacial (surface) water on a glacier is formed by the ice melting during the summer.

The ice at the GISP2 site in central Greenland was only one ice age thick before they hit rock, (as opposed to Antarctica where the ice is more than 6 cycles 700,000 years thick) indicating that ALL the Central Greenland ice melted during the previous warming cycle (125,000 years ago).

There were periods when more ice melted during summer, and periods when less melted.

Not exact matches

During melting snow and ice conditions, the Department of Buildings (DOB) is reminding all builders, contractors, and property...

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.

Today's red deer, which recolonized Europe after the ice sheet melted about 12,000 years ago, fall into three or four distinct lineages that likely correspond to separate southern regions to which the deer had retreated during the height of the ice age, Stanton says.

A recent study by Robert Kopp at Princeton University (Nature, DOI: 10.1038 / nature08686) suggests sea levels were 8 to 9 metres higher than now during the last interglacial, in part due to the west Antarctic ice sheet melting.

When polar bears» feeding opportunities decrease during the summer ice melt, the animals can reduce their energy expenditure a little, but not enough to make up for the food shortages, a study in the 17 July issue of Science shows.

During that time, temperatures were less than 1 °C warmer than they are today, but sea level stood about 5 to 9 meters higher due to large - scale ice sheet melt.

But when average temperatures rise, as is happening in many places around the world because of climate change, big blocks of ice melt more quickly than they can grow during the winter.

Nevertheless, some scientists claim that ratios of oxygen isotopes in marine fossils from the east coast of the US indicate that the Antarctic ice sheet melted at least partially during the Pliocene.

Some researchers say that the ice sheet must have melted during the Pliocene, allowing trees to cover the mountains and diatoms to thrive in the seas.

Roughly 14 million years ago during the Middle Miocene Climate Transition, ice stopped melting in Antarctica's southern Dry Valleys.

So parts of these ice sheets, but not all, must have melted during the long - ago warm period.

To get these findings, a NASA - funded team led by Laurence Smith, chair of the geography department at UCLA, spent six days on the ice during July 2012 — directly after a record - setting ice sheet melt.

Interior Secretary Dirk Kempthorne, however, made clear several times during a press conference announcing the department's decision that, despite his acknowledgement that the polar bear's sea ice habitat is melting due to global warming, the ESA will not be used as a tool for trying to regulate the greenhouse gas emissions blamed for creating climate change.

The reason: until the end of the melting season the fate of the ice is ultimately determined by the wind conditions and air and water temperatures during the summer months.

A new study has found that the massive Laurentide ice sheet that covered Canada during the last ice age initially began shrinking through calving of icebergs, and then abruptly shifted into a new regime where melting on the continent took precedence, ultimately leading to the sheet's demise.

When they analyzed these samples, they discovered that the ratio of the carbon isotope 13C to 12C was higher during the glaciation than after the ice had melted.

Better estimates of Pliocene sea levels will help geologists know how much of the ice sheets melted during that balmy era, Dowsett says, which may give us a glimpse of our own climate future.

During a record melting jag this past summer, the Greenland ice sheet lost 552 billion tons (19 billion tons lower than the previous low), and the volume of sea ice fell to half the volume it had four years ago.

As a result, more and more winter ice is growing on open stretches of water, making it thinner and more vulnerable to melting during its first summer.

In 2002, NASA's Odyssey orbiter detected evidence of ice just beneath the surface of the Martian north pole, raising the possibility that during a warm spell liquid water could melt out — a likely requirement for life.

If underground life is the source, methane might be released during the warmer months as the ice melts.

One major influence is the slow rebound of crust that was weighed down by massive ice sheets during the last ice age that have since melted away.

Ice melting occurs during the summer when temperatures rise above freezing in some places, depending on how high the ice is above sea level and how close it is to a poIce melting occurs during the summer when temperatures rise above freezing in some places, depending on how high the ice is above sea level and how close it is to a poice is above sea level and how close it is to a pole.

This puts the ice in direct contact with seawater and when the ocean warms, as it did during the Pliocene, the ice sheet becomes vulnerable to melting.

The team in today's study were able to determine that the ice sheet had partially melted during this «stable» period by analysing the chemical content of mud in sediments.

Fossil fuel burning, deforestation and farming have increased temperatures by nearly 2 °F during the past two centuries and caused ice to melt into the seas, causing them to rise at a quickening pace.

Some scientists have argued that Earth's crust in northern portions of North America is still slowly springing upward in response to the melting of the ice sheet that smothered the region during the last ice age.

Their findings indicated that twice as much soot was deposited on snow in winter compared with summer, meaning that the sunlight - absorbing soot likely caused greater melting of the Arctic ice cap during the winter.

Some scientists believe the ice sheet experienced significant melting during the relatively warmer conditions of the Pliocene, while others think it has remained almost entirely frozen for the last 14 million years.

«Our observations provide a crucial piece of evidence to support that suspicion, as they directly reveal the intensity of ice melting at the bottom of the glaciers during that period,» Khazendar said.

In a study out of the University of Arizona, researchers found that melting ice sheets had a greater impact on sea level rise than the thermal expansion of the oceans during the previous interglacial period 125,000 years ago.

During the last deglaciation, and likely also the three previous ones, the onset of warming at both high southern and northern latitudes preceded by several thousand years the first signals of significant sea level increase resulting from the melting of the northern ice sheets linked with the rapid warming at high northern latitudes (Petit et al., 1999; Shackleton, 2000; Pépin et al., 2001).

The lowest extent on record came during the remarkable summer melt season of 2012, fueled in part by summer storms that moved ice into warm waters.

What the scientists think happened was that the traditionally older, thicker ice around Greenland and the Canadian archipelago «just didn't melt away as much as it usually would» during the cooler summer conditions, «and it kind of just remained over the summer melt season,» Tilling said.

«During peak summer it can get a little warm during the day, and the ice can actually start to melt,» PetrenkoDuring peak summer it can get a little warm during the day, and the ice can actually start to melt,» Petrenkoduring the day, and the ice can actually start to melt,» Petrenko says.

With higher precipitation, portions of this snow may not melt during the summer and so glacial ice can form at lower altitudes and more southerly latitudes, reducing the temperatures over land by increased albedo as noted above.

When this is combined with rapid surface melt during warm summers, the ice shelves can disintegrate very quickly.

For starters, one simply can not equate the positive feedback effect of melting ice (both reduced albedo and increased water vapor) from that of leaving maximum ice to that of minimum ice where the climate is now (and is during every interglacial period).

That puts ice at a disadvantage during the upcoming melt season because it tends to be thinner and more prone to melting.