Sentences with phrase «summer ice period»

Not exact matches

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.

«Under the 4 - degree Celsius scenario, we would have a high probability of a three - month ice free period in the summer months by 2050.

In some parts of the Arctic, sea ice loss is causing polar bears to spend longer periods on shore each summer.

The summer minimum Arctic sea ice extent has decreased by 40 percent during the same time period.

Though technically considered a temperate species, the whales are spending more time in Arctic waters each summer because there is more plankton and a longer period without sea ice.

It confirmed that the mean albedo, or surface reflectivity, of the Arctic ice zone in late summer declined over an almost three - decade period, between 1982 and 2009.

«Reduced sea ice cover over a longer period of time over the summer could mean improved foraging for belugas,» said Hauser, who is also a researcher at the University of Alaska Fairbanks.

«The combined sea ice data suggest that the seasonal Arctic sea ice cover was strongly reduced during most of the early Holocene and there appear to have been periods of ice free summers in the central Arctic Ocean.

The new paper uses alkenones from the Svalbard islands and is among the first studies that present Arctic summer temperature change over the period from the end of the last Ice Age some 12000 years ago.

This warm air layer gets its heat reflected downwards during cloudy periods, especially during long night extensive cloudy periods, as a result, Arctic ocean ice doesn't thicken so much during darkness and leaves it up to summer sunlight (if there is some) to finish off what is left of it.

Researchers have attributed glacial decline to increasing temperatures, which have reduced the period of glacial accumulation and extended the period of summer ice melting (ablation).

At the time of the image, the Martian south pole was experiencing a summer period but during the winter the ice mass would reach far into the surrounding smoother terrain.

Because of this, ice deposits in the polar regions are likely to be diminished in the summer period, while the build - up of ice in Tombaugh Regio may have endured for millions of years.

Recent summers on the vast, white expanse of the Greenland ice sheet have featured some spectacular ice melt, including an alarming period in 2012 when nearly the whole surface showed signs of melt.

This warm air layer gets its heat reflected downwards during cloudy periods, especially during long night extensive cloudy periods, as a result, Arctic ocean ice doesn't thicken so much during darkness and leaves it up to summer sunlight (if there is some) to finish off what is left of it.

One thing I note in the 1900 - present graph is that the summer ice levels start dropping in the 1950's during the cool period of recent global warming.

Does it mean the first time the summer sea ice goes beneath this threshold or does it imply a probability of encountering low - ice conditions over a period of time?

Rising temperatures cause the sea ice to melt earlier in the year, driving the bears to shore before they have built sufficient fat reserves to survive the period of scarce food in the late summer and early fall.

The work pointing to periods of recovery on the way to a largely ice - free summer later in the century is still valid....

This afternoon, I asked Marika Holland, a climate and ice modeler at the National Center for Atmospheric Research, to consider recent ice trends in light of her work with Jennifer E. Kay and Alexandra Jahn on a paper finding likely periods of ice recovery on the way to an ice - free Arctic in summer.

Loso, M.G. (2008) Summer Temperatures during the Medieval Warm Period and Little Ice Age Inferred from Varved Proglacial Lake Sediments in Southern Alaska, Journal of Paleolimnology 41, 117 - 128, DOI: 10.1007 / s10933 -008-9264-9.

The sea ice at the end of this summer's period of melting is predicted to match or beat the all - time record low of 2007 and one research group at the University of Bremen in Germany has already announced that the ice this year has already set a record.

Scientists at the National Snow and Ice Data Center, in Boulder, Colorado measured the sea ice at the end of the 2012 summer period of melting and the measurements do not bode well for the extraordinary wildlife, ecology and cultures of the regiIce Data Center, in Boulder, Colorado measured the sea ice at the end of the 2012 summer period of melting and the measurements do not bode well for the extraordinary wildlife, ecology and cultures of the regiice at the end of the 2012 summer period of melting and the measurements do not bode well for the extraordinary wildlife, ecology and cultures of the region.

Glacial periods give way to interglacials on some occasions when the Northern Hemisphere's summer solar insolation (the amount of solar radiation received by Earth's surface) increases alongside corresponding decreases in ice volume and increases in temperature and atmospheric carbon dioxide (CO2).

1400 — 1549 the pre-culmination period of the Little Ice Age 1550 — 1849, the culmination period which contains the «years without a summer» 1850 — 1967, the post-culmination period in which a definite retreat of glaciers and substantial atmospheric warming occurred.

For many decades after that it will be a matter of «making hay when the sunshines» in the Arctic summers and the ice free period of those summers will grow longer and longer..

The trend in concentrated sea ice extent in the Arctic summer is not uniform across the study period but mostly a phenomenon of the latter half from 1998 - 2014.

The antarctic summer ice minimum extend dropped about 50 % during this period, suggesting warm ocean waters.

These preliminary results showed that, if current melt rates continue, the Arctic could see ice free periods during summer starting in less than 10 years.

The arctic summer ice minimum extent also dropped, about 20 to 25 %, during this period when air temperatures were falling.

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

A survey of trends in dispersed and concentrated sea ice extent in the Arctic in the northern summer and northern winter and in the Antarctic in the southern summer and southern winter for the period 1979 - 2015 shows a negative trend in dispersed and concentrated sea ice extent in the Arctic in the northern summer amid rising surface temperature in the northern hemisphere.

Annual net balance on eight North Cascades glaciers during the 1984 - 1994 period has been determined by measurement, of total mass loss from firn and ice melt and, of residual snow depth at the end of the summer season.

«The combined sea ice data suggest that the seasonal Arctic sea ice cover was strongly reduced during most of the early Holocene and there appear to have been periods of ice free summers in the central Arctic Ocean.»

«A paper recently published in the journal Weather finds that global summer average sunshine [solar short - wave radiation that reaches Earth's surface] dimmed during the period 1958 - 1983 [prompting an ice age scare], but markedly increased from 1985 - 2010.»

With the current increasing rate of climate changes, the North Pole may become ice free for extended periods every summer.

Atmospheric - circulation patterns in June — July were generally favorable for preservation of sea ice, at least compared to the same period in summer 2007.

Climate models suggest periods of stability (with variations around a stationary summer mean extent) with intermittent years of rapid reductions in ice extent as the Arctic warms (see Serreze, Mark C. 2011.

The ends of Ice Ages appear to correspond to periods of the 25k year precession cycle when the sun is closer in the northern summer, which tends to remove the glaciers over time.

Some previous models project an ice - free summer period in the Arctic Ocean by 2040 (Holland et al., 2006), and even as early as the late 2030s using a criterion of 80 % sea ice area loss (e.g., Zhang, 2010).

Chukchi Sea and Southern Davis Strait bears, for example, are doing very well — contrary to all predictions — despite marked declines in summer sea ice because they have ample food during their critical spring feeding period when sea ice is abundant.»

«There were indeed some warm period in those decades, but the sea ice came no where close to the summer lows we're seeing now.»

The Maunder Minimum occurred during the depths of the Little Ice Age, a period of feeble summers and bitingly cold winters, war, pestilence and famine.

Specifically, the estimate is calculated by multiplying the average (for the period 1985 - 2007) amount of ice that does not survive the summer (between the March maximum and the September minimum) by this year's March extent.

Such events would likely be driven by extended periods of rainfall over the ice during summer heating events.

Today, a huge rift has nearly bisected a large frontal section of the Larsen C Ice shelf — an ice system many times the size of its now deceased companions Larsen A and Larsen B. And during December — a period when Antarctica was warming into Austral Summer — this massive crack grew by 18 kilometeIce shelf — an ice system many times the size of its now deceased companions Larsen A and Larsen B. And during December — a period when Antarctica was warming into Austral Summer — this massive crack grew by 18 kilometeice system many times the size of its now deceased companions Larsen A and Larsen B. And during December — a period when Antarctica was warming into Austral Summer — this massive crack grew by 18 kilometers.

As sea ice declines, it becomes thinner, with less ice build - up over multiple years, and therefore more vulnerable to further melting.15 Models that best match historical trends project northern waters that are virtually ice - free by late summer by the 2030s.25, 26,12 Within the general downward trend in sea ice, there will be time periods with both rapid ice loss and temporary recovery, 27 making it challenging to predict short - term changes in ice conditions.

The summer of 2012 witnessed periods of extremely rapid sea ice melt.

Conclusions Early ice breakup in summer and / or late freeze - up in fall can not exclusively be blamed when polar bears struggle to get through the ice - free period.

Zhakarov's model is conceptually simple: during periods of high precipitation when winter ice forms readily, summer ice cover increases, the atmosphere cools, the arctic front together with its associated rain belt shifts south so that freshwater input to the Arctic Ocean decreases, and winter ice cover is thicker, has a deeper draft, and so survives better in summer.