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From: Linus lindgren, TT
Published:
Since the end of November, the sun has been shining for a total of zero hours over several Swedish cities.
Now it seems that the dark night climate can be explained by a Russian meteorological phenomenon.
On Tuesday, Aftonbladet was able to report on the dark truth: the sun has not shone in several Swedish municipalities for all of December.
It is Karlstad, Visby, Norrköping, Storlien and Stockholm who have not seen the sun in December.
It’s not really unusual to have a week without some sun in December, but Marie Staerk, a meteorologist at SMHI, tells TT that there are still unusually few hours of sunshine so far in December.
Umeå has had the most hours of sunshine in Sweden. On the 8th of December, the sun had shone for a total of four hours on the people of Umeå during the month.
Photo: TT / MONTAGE
The dark cloud cover over Sweden is due to high pressure from Russia. The image is a montage.
Russian high pressure
But now it seems that the dark time has been explained, a high pressure that is on Russia.
High pressure forms something called inversion. It is a special weather situation where the hot air cannot rise in the usual way.
– Normally, the temperature drops with altitude when we reach the atmosphere. But when we have an inversion, the temperature first drops but then increases. On that cape you have a cap, says Marie Staerk TT.
The lid keeps moisture and mist away because the sun isn’t that high in the sky during December so it can’t burn through the clouds.
– High pressure in winter often means it is cloudy and gray, while in summer it becomes very sunny, says Marie Staerk, to TT.
Smog shape
In addition to being dark and gray, investments can cause other problems. In larger cities, it can create smog as the phenomenon means that exhaust gases and pollutants can remain at ground level.
A normal year, seen by studies from 1961-1990, Stockholm receives an average of 33 hours of sunshine in December, Gothenburg 40, Lund 32 and Umeå 21. There is a long way to go before those figures, says Marie Staerk. You won’t see any shine in the future either.
– Actually, it’s pretty bad with the chances of sunshine. I dare not trust the few gaps I have seen in the forecast.
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