An extremely uncommon atmospherical result has been cooking above Antarctica for the retiring match of months and it could ensue in temperature in the upper atmosphere to mouse up by 30 ° C ( 54 ° F).The phenomenon is calledsudden stratospheric warming , the most spectacular meteorological phenomenon to take property in the stratosphere .
Scientists at the Australian Bureau of Meteorology ( BOM)first noticed this eventin the last calendar week of August when stratospheric temperatures crept up higher than anticipate . Over the come weeks , the thaw proceed to rise up at a surprising charge per unit . If their forecasts are on the money , we can be in store for the strongest sudden stratospheric warming event ever register .
Newly develop climate manikin have also highlighted how this could have a knock - on core across parts of the Southern Hemisphere . Reporting their findings in the journalNature Geoscience , a squad from BOM and Monash University in Australia have shown that these conditions in Antarctica could even activate bake hot atmospheric condition weather in Australia .
The event is tight linked to the disturbance or dislocation of the diametric vortex above Antarctica , the vast low - pressure geographical zone that spiral around the South Pole in a clockwise direction ( and counter - clocker in the North Pole ) .
Some warming can be expected around springtime in the upper reaches of the South Pole ( a similar event hap in the North Polar too ) . In any distinctive wintertime , temperature dispute between the freezing icy realm and the not - so - parky Southern Ocean result in herculean winds in the stratosphere high above the South Pole as part of the polar vortex . As leaping arrives and the Sun shifts further southwards , warm temperature cause these winds to gradually quieten down .
However , this change can sometimes occur too aggressively . If so , bursts of air from the small ambiance push into the stratosphere , which weakens the polar vortex or can even reverses the flow of winds within it . The outcome is a outrageous rise in temperatures in the upper aura , aka a sudden stratospheric warming result .
It ’s unclear how often this event occurs . Scientists have only document one other truesudden stratospheric warming effect in the Southern Hemisphere , which occurredin September 2002 , withrecords begin in the 1950s . It ’s now looking like this year ’s event could be more intense than the 2002 event .
According to the new field , the upshot can have some far - reaching effects elsewhere in the world because it meddle with winds in thepolar jet stream .
" Our study is significant because it is the first of its kind to name and quantify a verbatim connection between variations in the Antarctic polar whirlpool in spring and Australian hot and juiceless extremes from late outpouring to early summertime , " study generator Dr Ghyslaine Boschat , an environmental inquiry fellow at Monash University , allege in astatement .
" This has major deduction for the predictability of extreme climate in Australia , as well as possibly other regions of the Southern Hemisphere . "
