Share on Reddit Even though the entire globe has warmed over the last few decades, the Arctic has seen the greatest changes in temperatures. One of the clearest readouts of that change has been the sea ice that fills the Arctic ocean each winter.
Rising temperatures[ edit ] According to the Intergovernmental Panel on Climate Change"warming in the Arctic, as indicated by daily maximum and minimum temperatures, has been as great as in any other part of the world. The authors conclude that "anthropogenic increases in greenhouse gases have led to unprecedented regional warmth.
Arctic amplification The poles of the Earth are more sensitive to any change in the planet's climate than the rest of the planet. In the face of ongoing global warming, the poles are warming faster than lower latitudes.
The primary cause of this phenomenon is ice-albedo feedbackwhereby melting ice uncovers darker land or ocean beneath, which then absorbs more sunlight, causing more heating. Arctic sea ice decline Sea ice is currently in decline in area, extent, and volume and may cease to exist sometime during the 21st century.
Blue shading indicates the pre-satellite era; data then is less reliable. In particular, the near-constant level extent in autumn up to reflects lack of data rather than a real lack of variation.
Oct 16, · For another thing, removing sea ice allows more heat transfer from ocean to atmosphere in the Arctic, and that dramatically changes wind circulation patterns. It seems to be making the jet stream more wavy, which allows weather systems (including unpleasant ones like heavy rain or heat waves) to be more persistent so bad conditions hang around longer. Watch video · [Arctic sea ice is at a record low and could, in spurts, disappear within our lifetimes] Jason Samenow Jason Samenow is The Washington Post. Arctic sea ice extent on January 1, was million square kilometres, over million sq km smaller than the long term average, and , sq km smaller than it was just one year before.
Reliable measurement of sea ice edges began with the satellite era in the late s. Before this time, sea ice area and extent were monitored less precisely by a combination of ships, buoys and aircraft. Multi-year ice is shown in bright white, while average sea ice cover is shown in light blue to milky white.
The data shows the ice cover for the period of 1 November through 31 January in their respective years.
From toArctic sea ice minimum extent was higher thanbut it did not return to the levels of previous years. From —, the average per decade decline in entire ice coverage was a 2.
For the decade endingthese values have risen to These are comparable to the September to September loss rates in year-round ice i.
Exact measurements can be made only at a limited number of points. Because of large variations in ice and snow thickness and consistency air- and spaceborne-measurements have to be evaluated carefully. Nevertheless, the studies made support the assumption of a dramatic decline in ice age and thickness.
One study suggests —  and another suggests Photo Taken in August Main article: Arctic methane release This century, thawing of the various types of Arctic permafrost could release large amounts of carbon into the atmosphere.
Following thaw, collapse and erosion of coastline and seafloor deposits may accelerate with Arctic amplification of climate warming. A new study used field observations, radiocarbon dating, and remote sensing to account for thermokarst lakes, the authors concluded that, ".
Clathrate gun hypothesis Subsea permafrost occurs beneath the seabed and exists in the continental shelves of the polar regions.
Sea ice serves to stabilise methane deposits on and near the shoreline,  preventing the clathrate breaking down and venting into the water column and eventually reaching the atmosphere. They also found that during storms, methane levels in the water column drop dramatically, when wind-driven air-sea gas exchange accelerates the ebullition process into the atmosphere.
This observed pathway suggests that methane from seabed permafrost will progress rather slowly, instead of abrupt changes. However, Arctic cyclones, fueled by global warming and further accumulation of greenhouse gases in the atmosphere could contribute to more release from this methane cache, which is really important for the Arctic.
Shades of green depict areas where plant productivity and abundance increased; shades of brown show where photosynthetic activity declined.
The maps show a ring of greening in the treeless tundra ecosystems of the circumpolar Arctic—the northernmost parts of Canada, Russia, and Scandinavia. Tall shrubs and trees started to grow in areas that were previously dominated by tundra grasses.
The researchers concluded that plant growth had increased by 7 to 10 percent overall. However, boreal forests, particularly those in North America, showed a different response to warming.
Many boreal forests greened, but the trend was not as strong as it was for tundra of the circumpolar Arctic.
Droughts, forest fire activity, animal and insect behavior, industrial pollution, and a number of other factors may have contributed to the browning. The impact on mosses and lichens is unclear as there exist very few studies at species level, also climate change is more likely to cause increased fluctuation and more frequent extreme events.
In the winter they trap more snow which insulates the permafrost from extreme cold spells, but in the summer they shade the ground from direct sunlight.Arctic Sea Ice, record low sea ice maximum recorded March , with indicated by the red line / Courtesy NOAA nationwidesecretarial.com, from NSIDC Charctic data The poor showing was not unexpected; the Arctic sea ice minimum in September tied with September ’s minimum for the second lowest yearly minimum extent in the satellite record.
The extent of sea ice surrounding the Arctic and Antarctic regions are both at record lows for this time of year — marking the first time scientists have simultaneously tracked record low ice.
The Arctic voyage by the 3, foot container capacity Venta Maersk is the latest step in the expansion of the so-called Northern Sea Route which is becoming more accessible to ships as climate change reduces the amount of sea ice.
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|Antarctic Sea Ice - nationwidesecretarial.com||Why does this remind me of how Republicans are now praising the economy because the stock market prices are high and the unemployment rate is low, conveniently ignoring the exploding deficit, and poor wage growth?|
|Antarctic Daily Images||It did not, however, push the Arctic out of its present trend of long term declines. Moreover, we are again set on a very low platform for sea ice as we enter what is predicted to be a warmer than normal start to melt season.|
|Arctic’s strongest sea ice breaks up for first time on record | National Observer||By Tom Yulsman January 30, 5:|
Aug 20, · Sea ice is particularly low in the East Siberian side of the Arctic and the Beaufort Sea north of Alaska, the center reported. Ice in the Canadian Archipelago is also quite low. New York Times accurately covers record low Arctic winter sea ice extent in The New York Times, by Henry Fountain “The article accurately reports on the state of Arctic sea ice at the annual maximum (in March) and its causes, and gives an insightful discussion as to the implications.
March sea ice extent reached the lowest extent on record in and hit roughly the same low again in —about 7 percent less than the – average. All months have shown a negative trend in sea ice extent over the past several decades.