Sentences with phrase «when polar temperature»

One shows a nonlinear transition to a new stable state in < 10 years when polar temperature rises above − 5 °C (13 °C above present), whereas the other shows a more linear transition.

Not exact matches

But when tree rings, pollen counts in polar ice, and temperature records from multiple places around the world all point in the same direction, we become increasingly confident that global warming is a reality.

Thus temperatures during the period when a lot of sunlight first returns to the polar areas following winter, March in the Arctic and September in the Antarctic, are crucial.

When low - temperature ice covers the Arctic Ocean there is little evaporation or sublimation and the polar regions are quite dry in terms of precipitation, comparable to the amount found in mid-latitude deserts.

The temperatures themselves are greatly influenced by the strength of the polar vortex, a wind that swirls around the pole and when strong, can keep air confined throughout the winter in the polar night, allowing it to cool dramatically.

Thus temperatures during the period when a lot of sunlight first returns to the polar areas following winter, March in the Arctic and September in the Antarctic, are crucial.

«Borehole temperatures in the ice sheets spanning the last 6000 years show Antarctica repeatedly warming when Greenland cooled, and vice versa... The phenomena has been called the polar see - saw... Attempts to account for it have included the hypothesis of a south - flowing warm ocean current with a built in time lag... There is (however) no significant delay in the Anarctica climate anomaly...

Mid-latitude storms are most active during winter, i.e. cold season, when the Arctic experiences polar nights and there is stron temperature gradients.

The corresponding future temperatures in Greenland are comparable to those inferred for the last interglacial period 125,000 years ago, when paleoclimatic information suggests reductions of polar land ice extent and 4 to 6 m of sea level rise.

On the onset of spring, when the Sun comes up over the polar night but the air is still winter - cold, over the Arctic all conditions can suddenly be met to set the catalytic ozone breakdown reaction in motion: sunlight, moist, CFKs [yes, they're still around] and temperatures of -90 ºC (or colder).

When talking about climate change, most of us imagine a smattering of statistics flowing across charts and figures showing rising temperatures, the thawing of ice on mountain caps and polar... Read more»

The northern latitude areas have benefited from rising temperatures due to the «polar amplification», but when the process is reversed they may suffer the most.

Often when the polar vortex is strong, temperatures are mild in the mid-latitudes across the Eastern US and Northern Eurasia; and when the vortex is weak, temperatures tend to be cold across the Eastern US and northern Europe and Asia.

Sudden Stratospheric Warming (SSW)- when temperatures rise dramatically in the polar stratosphere in a mater of days.

When oceans get cold, and the surface of polar waters freezes, it snows much less and the sun takes away ice and limites the lower bound of temperature and sea level.

The temperature that polar oceans thaw, Arctic and Antarctic, is the set point and cooling is always turned on when the oceans thaw and cooling is always turned off when the oceans freeze.

And we also don't get say 15 C increase in temperature in Tropics when it is a 30 C world, nor does the poles become much colder when we in colder world of 10 C, rather it's expansion area of polar region climate and contraction of tropical regions.

The high and persistent temperatures this fall are particularly extraordinary, scientists said, because the region has already plunged into «polar night,» the time of year when the sun no longer rises over the North Pole.

The zone of convergence, or polar front, is most strongly developed in winter, when the contrast in temperature and humidity of the air between the converging flows is greatest.

The last time in Earth history when the global average surface temperature was as warm as the IPCC projects for 2100 in its mid-range scenarios, there was very little polar ice and sea level would have been roughly 70 meters (over 200 feet) higher than at present.

For example, Gavin's Pussycat has already pointed out that in their analysis they did not take into proper account how polar amplification results in larger swings in temperature at higher latitudes — and that when estimating temperature variation at lower latitudes on the basis of proxies at higher latitudes one has to scale down the variation, that is recognize that the swings in temperature will be smaller at those lower latitudes.

The latitudinal temperature gradient in summer is much smaller, thus providing less drive for exchange of air masses between middle latitudes and polar regions — and when exchange occurs the effect on temperature is less than that caused by a winter «polar express» of Arctic (or Antarctic) air delivered to middle latitudes.

«Stratospheric sudden warming» events occur when temperatures rise and 80 - mph «polar vortex» winds encircling the Artic suddenly weaken or even change direction.

To sum up, recent global temperatures, weather, polar ice and sea levels are consistent with our knowledge of corresponding Holocene climate variability measures when man was not a factor to be considered.

It is also a significant place when it comes to global climate change — it is the polar regions of the planet that are experiencing the biggest rises in temperature and changes to the landscape, threatening the very survival of the polar bear.