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Record temperatures up to 4C above normal have been recorded in west Antarctica, even as the extent of sea ice has reached record levels.
Perhaps the most important fact about the (slight) increase in total Antarctic sea ice extent is that it masks major and contrasting regional changes. For example, there has been a strong decrease in sea ice duration in the Bellingshausen Sea, while the duration has increased in the western Ross Sea. Such curiosities have led sea ice scientists to investigate several possible mechanisms, and explanations for these patterns are now starting to emerge.
The Amundsen Sea Low is a pattern of low atmospheric pressure in the Pacific part of the Southern Ocean, which drags warm air south and pushes cold air north. This southward flow of warm air meets Antarctica in the Bellingshausen Sea, explaining why ice in this area is now in decline. Meanwhile, the cold air is being pushed north from the western Ross Sea — where sea ice extent is increasing. So the Amundsen Sea Low can be used to explain at least two variations in Antarctic sea ice.
The Southern Annular Mode (also called the Antarctic Oscillation) is a term that describes the north-south position of the westerly wind belt that encircles Antarctica in the Southern Ocean. These winds are known variously as the “roaring 40s”, “furious 50s”, and “screaming 60s” depending on their latitude, and when they meet sea ice they drive it northwards (away from Antarctica). Like many other climate patterns (such as El Niño/La Niña), SAM has “positive” and “negative” phases. A positive SAM pushes the winds south to higher latitudes, meaning they encounter more sea ice, pushing more of it northwards and increasing the total ice extent. The Amundsen Sea Low also strengthens with the Southern Annular Mode’s positive phase. The mode has been strongly positive over the past three decades, helping to explain the overall increase in Antarctic sea ice extent, as well as the regional variations.
But that isn’t global warming … or is it?
Here’s the kicker: The strengthening of SAM over recent decades has been directly linked to human activity. Since the 1940s, ozone depletion and increasing greenhouse gases have caused the westerly winds to intensify and migrate south toward Antarctica.
originally posted by: Rezlooper
originally posted by: DAZ21
Hold on didn't you guys just have one of the coldest winters in decades?
In an attempt to get up a silly fast post for stars, it's obvious you didn't read the OP.
I, in my little neck of the woods, am not the WORLD
originally posted by: onthedownlow
Out here one the west, it seems to me that we have had of one of the mildest summers I can remember. It would be nice if we knew who is suffering from all these heat wave, Arizona's not. I am just a stupid American, so maybe the rest of the world could ring in, it would help me if I could here from some of those that are dealing with record temperatures.
Thanks!
originally posted by: the2ofusr1
N.E. reporting in here and it was a cooler then normal summer .It's darn right cool today .Usually the cool only starts around Halloween in my neck of the woods .No Mosquitoes though and that is always a good thing . ETA Bob Tisdale has a good post up over at WUWT and all the graphs ans specific adjustments to the metrics they are constantly changing .. wattsupwiththat.com... Good thing there are people that actually know what is being said in the data .
originally posted by: Rezlooper
originally posted by: DAZ21
Hold on didn't you guys just have one of the coldest winters in decades?
In an attempt to get up a silly fast post for stars, it's obvious you didn't read the OP.
I, in my little neck of the woods, am not the WORLD