Zmiany intensywności wyżu syberyjskiego i ich wpływ na temperaturę powietrza w środkowej Syberii
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Date
2015
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Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk
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Abstract
On the basis of daily data from Baseline Meteorological Data in Siberia, Version 5.0 for 5 stations
located in central Siberia changes in the intensity of the Siberian High 1950–2008 and their impact on air
temperature were examined. It was found that trends of the air pressure were negative in the centre of the
Siberian High in the analysed period, particularly from the 1980s. The decrease in Siberian High intensity was
correlated with an increase in temperature in the region. Using the average daily values of sea level pressure
for the Asian sector of the Northern Hemisphere (reanalysis data), it was demonstrated that the occurrence of
extremes in winter air temperature are strongly dependent on the Siberian High intensity and other macro-scale
circulation patterns. Occurrence of the lowest values of temperature is accompanied by a strengthening of the
Siberian High and by the negative phase of the Arctic Oscillation, while the highest values of air temperature
in winter months are associated with negative pressure anomalies over the Northeastern Asia, which means
a weakening of the Siberian High and intensifying of the influx of air masses from the west.
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Keywords
Siberian High, air temperature, sea level pressure, climate change
Citation
Badania Fizjograficzne, Seria A, Tom 66, 2015, s. 7-20