Al geruimte tijd begeeft zich boven het noordwesten van Siberie een vrij intens lagedrukgebied. Dit laag lijkt te gaan verdwijnen en de luchtdruk in grote delen van Siberië wordt vrij hoog.
http://www.meteociel.fr/modeles/ecmwf.php?ech=168&mode=1&map=1&type=0&archive=0
Waarom noem ik dit? In een interview met Judah Cohen (hij is er maar druk mee
) van afgelopen 2 december staat het volgende:
[In our methodology linking Eurasian snow cover and the eastern U.S. winter outlook], we have identified six steps in a cycle starting with the advance of the October Eurasian snow cover and ending with the winter AO. These steps happen sequentially over the course of several months. We are still early in the cycle, at step two, which is the buildup of a strong and expansive Siberian high following the extensive snow cover from this past October. I wouldn’t say that the hand-off from the snow cover to the atmosphere has been fumbled but rather bobbled. A deep polar low has taken residence across northwestern Asia and Barents–Kara seas (B-K) region that has not allowed the Siberian high to expand northward that is optimal for wave driving necessary to break down the stratospheric polar vortex. Somewhat ironically sea ice in the region has been running at or above normal this fall, which is very different from what we have observed over the recent past where the largest winter sea ice deficits have been in in the B-K region.
In a recent review article on the possible link between Arctic amplification [more climate warming in the Arctic compared to lower latitudes] and extreme weather, my co-authors and myself hypothesized that high Eurasian snow cover and low B-K sea ice can constructively interfere to weaken the polar vortex. The relatively high sea ice in the B-K this year is more hospitable for low pressure. Therefore, at least in my opinion, snow cover is on its own in forcing a weakening of the polar vortex this winter [which could cause pieces of it to break off, resulting in outbreaks of frigid air over the eastern U.S. and Europe].
http://www.meteociel.fr/modeles/ecmwf.php?ech=168&mode=1&map=1&type=0&archive=0
Waarom noem ik dit? In een interview met Judah Cohen (hij is er maar druk mee
) van afgelopen 2 december staat het volgende: [In our methodology linking Eurasian snow cover and the eastern U.S. winter outlook], we have identified six steps in a cycle starting with the advance of the October Eurasian snow cover and ending with the winter AO. These steps happen sequentially over the course of several months. We are still early in the cycle, at step two, which is the buildup of a strong and expansive Siberian high following the extensive snow cover from this past October. I wouldn’t say that the hand-off from the snow cover to the atmosphere has been fumbled but rather bobbled. A deep polar low has taken residence across northwestern Asia and Barents–Kara seas (B-K) region that has not allowed the Siberian high to expand northward that is optimal for wave driving necessary to break down the stratospheric polar vortex. Somewhat ironically sea ice in the region has been running at or above normal this fall, which is very different from what we have observed over the recent past where the largest winter sea ice deficits have been in in the B-K region.
In a recent review article on the possible link between Arctic amplification [more climate warming in the Arctic compared to lower latitudes] and extreme weather, my co-authors and myself hypothesized that high Eurasian snow cover and low B-K sea ice can constructively interfere to weaken the polar vortex. The relatively high sea ice in the B-K this year is more hospitable for low pressure. Therefore, at least in my opinion, snow cover is on its own in forcing a weakening of the polar vortex this winter [which could cause pieces of it to break off, resulting in outbreaks of frigid air over the eastern U.S. and Europe].
„Et nul ne se connait tant qu'il n'a pas souffert, „C'est une dure loi, mais une loi suprème, „Vieille comme le monde et la fatalité, „Qu'l nous faut du malheur regevoir le baptéme, ~Et qu'a ce triste prix tout doit étre acheté. „Les moissons pour murir out besoin de rosée, „Pour vivre et pour sentir l'homme a besoin de pleura, „La joie a pour symbole une plante brisée, „Humide encore de pluie et couverte de fleurs."