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Hladen dan v nekem kraju nima nič skupnega z dolgoročnim trendom dvigovanja globalnih temperatur.
"Avstrijo je danes presenetil najzgodnejši sneg, kar pomnijo, z napovedano snežno odejo v gorah, debelo od 30 do 40 cm. Tako dramatični padci temperature so v očeh tistih, ki dvomijo, da našemu planetu grozijo podnebne spremembe, nedvomen dokaz o nasprotnem." (Mail Online)
Lahko je pomešati dnevne vremenske dogodke z dolgoročnimi podnebnimi trendi in težko je razumeti razliko med vremenom in podnebjem. To je podobno, kot če skušate, stoječ na obali, ugotoviti ali je plima ali oseka tako, da opazujete posamezne valove, ki se valijo na plažo in se potem umikajo. Počasna sprememba plimovanja je zakrita s stalnim mešanjem valov.
Nenehno spreminjanje vremena na podoben način otežuje opazovanje majhnih sprememb podnebja. Če želite ugotoviti podnebne trende, morate pogledati, kako se vreme spreminja skozi daljša časovna obdobja. Če pogledamo podatke maksimalnih in minimalnih temperatur za zadnja desetletja, vidimo, da se rekordno visoke temperature pojavljajo skoraj dvakrat pogosteje kot rekordno nizke (slika 1).
Slika 1. Razmerje med izmerjenimi rekordno visokimi in nizkimi temperaturi v celinskem delu ZDA po desetletjih. Vir: UCAR
V bodoče se bodo še pojavljale rekordno nizke temperature, vendar bodo zaradi vpliva globalnega segrevanja postajale vse redkejše.
Translation by Slovenian Meteorological Society, . View original English version.
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