Summer Atmospheric Blockings in the Northern Hemisphere: Changes in Recent Decades (1993–2023)

The analysis of summer atmospheric blockings in the Northern Hemisphere (NH) under climate changes in 1993–2023 was carried out. The results of the analysis indicate a significant increase in blocking activity in the summer seasons in the NH atmosphere in recent decades. The noted trend is manifested against the background of a general increase in the NH surface air temperature in summer seasons. The sensitivity parameters to changes in the NH surface air temperature in summer seasons of the total duration of summer atmospheric blockings, their number, average duration, size and intensity are estimated. In particular, a statistically significant estimate of an increase in the total duration of summer atmospheric blockings by three quarters under the increase in the average summer surface air temperature of the NH by 1K is obtained.