Sentences with phrase «sea ice cover there»

The Arctic Ocean's shift from perennial to seasonal ice is preconditioning the sea ice cover there for more efficient melting and further ice reductions each summer.

According to Seager et al. (2002) THC appears to account for the North America vs. Europe winter temperature difference only in the highest latitudes, north of about 60 degrees N, due to the fact that the heat transport limits sea ice cover there.

Not exact matches

This past September the National Snow and Ice Data Center in Boulder, Colo., which collects polar and ice information for the government, announced that there was less sea ice covering the Arctic Ocean than at any time since satellite measurements began in 19Ice Data Center in Boulder, Colo., which collects polar and ice information for the government, announced that there was less sea ice covering the Arctic Ocean than at any time since satellite measurements began in 19ice information for the government, announced that there was less sea ice covering the Arctic Ocean than at any time since satellite measurements began in 19ice covering the Arctic Ocean than at any time since satellite measurements began in 1979.

«If there were a link, it would be more likely to occur in fall [when the Arctic sea ice is at a low and the region is warm] than it would in January [when the Arctic is ice - covered and cold], so from that point of view, it's not a compelling candidate at this time of year,» Hoerling said.

«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.

Consistent with observed changes in surface temperature, there has been an almost worldwide reduction in glacier and small ice cap (not including Antarctica and Greenland) mass and extent in the 20th century; snow cover has decreased in many regions of the Northern Hemisphere; sea ice extents have decreased in the Arctic, particularly in spring and summer (Chapter 4); the oceans are warming; and sea level is rising (Chapter 5).

There were hints that the floating sea - ice cover at summer's end was receding, accompanied by shifts in ocean circulation.

On the upper deck there is large partially covered area for enjoying a morning sea breeze or an ice cold beer in the evening.

There are subtle effects such as the planet losing more heat from the open sea than from ice - covered region (some of this heat is absorbed by the atmosphere, but climates over ice - covered regions are of more continental winter character: dry and cold).

The point here isn't that anybody can prove that there has never been this extent of Greenland melting at some prior time in the Holocene, but that all of these indicators taken together (Arctic temperatures, low sea ice extent in summer * and * winter, permafrost melting, decreased snow cover, Greenland melting) indicate that the Arctic as a whole really is warming in an exceptional way.

(57j) For surface + tropospheric warming in general, there is (given a cold enough start) positive surface albedo feedback, that is concentrated at higher latitudes and in some seasons (though the temperature response to reduced summer sea ice cover tends to be realized more in winter when there is more heat that must be released before ice forms).

There are several things that are well proven and simple to understand — for example, global termperature increase, sea level rise, polar ice cover, glacier retreat, and snow cover.

Re 9 wili — I know of a paper suggesting, as I recall, that enhanced «backradiation» (downward radiation reaching the surface emitted by the air / clouds) contributed more to Arctic amplification specifically in the cold part of the year (just to be clear, backradiation should generally increase with any warming (aside from greenhouse feedbacks) and more so with a warming due to an increase in the greenhouse effect (including feedbacks like water vapor and, if positive, clouds, though regional changes in water vapor and clouds can go against the global trend); otherwise it was always my understanding that the albedo feedback was key (while sea ice decreases so far have been more a summer phenomenon (when it would be warmer to begin with), the heat capacity of the sea prevents much temperature response, but there is a greater build up of heat from the albedo feedback, and this is released in the cold part of the year when ice forms later or would have formed or would have been thicker; the seasonal effect of reduced winter snow cover decreasing at those latitudes which still recieve sunlight in the winter would not be so delayed).

Lastly, there is significant independent evidence for warming in the oceans, snow cover and sea ice extent changes.

They present the data for 2007 to 2013, compared to the new 30 year average1, and note that the Beaufort Sea had «the most extensive ice cover seen there in the last seven summers.»

The only problem with all the predictions about the level of the World Ocean rising is that, the World Ocean is refusing to rise up in support of the predictions, the other problem is that ice is frozen fresh water and frozen fresh water only covers about 5 % of this planet above sea level and frozen water under the level of the World Ocean does not count as the World Ocean will fall a small amount if that ice melts, so if the ice there is enough to get the World Ocean to rise and significant amount then it must be piled up very high, I cubic kilometer of water as ice, should it melt, would make 1000 square kilometers rise by one meter, so when you use this simple math then somewhere on the planet, above the level of the sea, then there must be over 500,000 cubic kilometers of ice, piled up and just waiting to melt, strange that no one can find that amount of ice, all these morons who talk about the rise of the World Ocean in tens of meters, this includes you Peter Garrett or Mr. 7 Meters, the ice does not exist to allow this amount of rise in the World Ocean, it is just not there.

The US National Snow and Ice Data Center states there has been a slight gain in Antarctic sea - ice cover of 0.9 per cent since 1979, the equivalent of about 100,000 sq km per decaIce Data Center states there has been a slight gain in Antarctic sea - ice cover of 0.9 per cent since 1979, the equivalent of about 100,000 sq km per decaice cover of 0.9 per cent since 1979, the equivalent of about 100,000 sq km per decade.

In Iceland there is the Koch sea ice index which extends back at least two centuries, and for the GIN sea (east of Greenland) there is the Vinje index, which covers most of the 20th century.

One of the difficulties using charts based on in situ observations is that there was very little exploration poleward of the «marginal ice zone» (the area of partial sea ice cover near the ice edge), so in older reconstructions the ice concentration was often assumed to be 100 % beyond the marginal zone.

Besides these thousands of thermometer readings from weather stations around the world, there are many other clear indicators of global warming such as rising ocean temperatures, sea level, and atmospheric humidity, and declining snow cover, glacier mass, and sea ice.

«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.»

If cloud cover increases as sea ice decreases, that could offset the direct effect of the SIAF, especially if clouds increase in summer, when there is the most sun and the most sea - ice loss.

In the Barents Sea, however, there are ice - free areas west of Nova Semlja that were completely covered by ice in 2009 and 2010.

For the high Arctic, we have already noted that there are relatively few land stations, (a handful above 80N), and most of this area is currently still covered by permanent sea ice.

To clarify, sea ice at the Arctic (North Pole) is all there is, while sea ice at the Antarctic (South Pole) is in addition to the immense glacial ice that covers the land.

For more on the terrestrial foods topic, see my detailed discussion in this previous post, and this recent (March 30) ScienceNews report on yet another, largely anecdotal «polar bears resort to bird eggs because of declining sea ice» story (see photo below, based on a new paper by Prop and colleagues), which was also covered March 31 at the DailyMail («Polar bears are forced to raid seabird nests as Arctic sea ice melts — eating more than 200 eggs in two hours,» with lots of hand - wringing and sea ice hype but little mention of the fact that there are many more bears now than there were in the early 1970s around Svalbard or that the variable, cyclical, AMO (not global warming) has had the largest impact on sea ice conditions in the Barents Sesea ice» story (see photo below, based on a new paper by Prop and colleagues), which was also covered March 31 at the DailyMail («Polar bears are forced to raid seabird nests as Arctic sea ice melts — eating more than 200 eggs in two hours,» with lots of hand - wringing and sea ice hype but little mention of the fact that there are many more bears now than there were in the early 1970s around Svalbard or that the variable, cyclical, AMO (not global warming) has had the largest impact on sea ice conditions in the Barents Sesea ice melts — eating more than 200 eggs in two hours,» with lots of hand - wringing and sea ice hype but little mention of the fact that there are many more bears now than there were in the early 1970s around Svalbard or that the variable, cyclical, AMO (not global warming) has had the largest impact on sea ice conditions in the Barents Sesea ice hype but little mention of the fact that there are many more bears now than there were in the early 1970s around Svalbard or that the variable, cyclical, AMO (not global warming) has had the largest impact on sea ice conditions in the Barents Sesea ice conditions in the Barents SeaSea).

Another difference is that in 2013 there were areas of decreased concentration north of the Kara and Barents sea; this year, most of the Arctic sea ice prevails at higher concentrations, indicating a more consolidated and possibly thicker ice cover, which is more resilient to melt and retreat.

There followed speculation on possible ways of combating this catstrophic cooling, like blowing polar ice up with nuclear energy or covering sea with «black soot».

Global sea level has risen, and there have been large reductions in snow - cover extent, glaciers, and sea ice.

In fact, since snow covered sea ice insulates, there can be a negative feedback from an open Arctic ocean.

In other words, there has been virtually no change in sea ice cover over the last 12 years, despite the fact that atmospheric CO2 has now surpassed 410 parts per million, a considerable and steady increase over levels in 2006 which were about 380 ppm (see below, from the Scripps Oceanographic Laboratory, included in the Washington Post story 3 May 2018):

It's still cutting - edge research and there's no smoking gun, but there's evidence that with less sea ice, you put a lot of heat from the ocean into the atmosphere, and the circulation of the atmosphere responds to that... We've seen a tendency for autumns with low sea ice cover to be followed by a negative Arctic Oscillation.

And there's a «probably low» but unknown risk that warmer rising seas could undermine the ice sheet that covers western Antarctica, raising average sea levels far more and more quickly than the roughly 1 meter (3 feet) they're now projected to increase by 2100.

In both images, 100 % sea ice is shown in white, and the yellow line encompasses the area ion which there was at least 15 % ice cover in at least half of the 25 - year record for the given month.

This is the case in Antarctica for March 2018, where there is only a weak correspondence between the sea - ice cover and the surface air temperature.

There is some evidence that the Arctic sea - ice cover has decreased about 6 % during the last two decades, and that the mean ice thickness has decreased as well.

«There is unequivocal evidence that Earth's lower atmosphere, ocean, and land surface are warming; sea level is rising; and snow cover, mountain glaciers, and Arctic sea ice are shrinking.

«Even if the thermometer had never been invented, the evidence is there from deep ocean changes, from receding glaciers, from rising sea levels and receding sea ice and spring snow cover.

There was also less sea ice during this time (1887 - 1945), as the sea ice cover disappeared 1.1 month sooner than it does today.

Cohen published a study in September that found this Arctic paradox pattern has become common in years with low fall sea ice cover and rapidly advancing fall snow cover across parts of Asia, and that there is a likely link between the trends.

While Goddard's anecdotes are interesting there's plenty of more concrete compiled data covering the last 100 years, which suggest sea ice levels today are lowest for over 100 years:

There are no accurate sea ice records that cover the «past several decades».

«It is very likely that there will be continued loss of sea ice extent in the Arctic, decreases of snow cover, and reductions of permafrost at high latitudes of the Northern Hemisphere by 2016 — 2035.

They conclude with another warning: ``... if major shifts in sea ice cover and ocean circulation tip even large ice shelf cavities from cold to warm (35), there could be major changes in ice shelf and thus ice sheet mass balance.»

Thus, while there has been persistence of low summer ice conditions the last few years, model results suggest we can not rule out short periods of increased sea ice cover, but that this in no way contradicts the long - term sea ice loss.

Further, there has been an almost worldwide reduction in glacial mass and extent in the 20th century; melting of the Greenland Ice Sheet has recently become apparent; snow cover has decreased in many Northern Hemisphere regions; sea ice thickness and extent have decreased in the Arctic in all seasons, most dramatically in spring and summer; the oceans are warming; and sea level is rising due to thermal expansion of the oceans and melting of land Ice Sheet has recently become apparent; snow cover has decreased in many Northern Hemisphere regions; sea ice thickness and extent have decreased in the Arctic in all seasons, most dramatically in spring and summer; the oceans are warming; and sea level is rising due to thermal expansion of the oceans and melting of land ice thickness and extent have decreased in the Arctic in all seasons, most dramatically in spring and summer; the oceans are warming; and sea level is rising due to thermal expansion of the oceans and melting of land iceice