A comparison of maps of mean sea level pressure (MSLP) for two normal peridos enabled the detection of variations in MSLP over Europe and the Middle East. Even though a general pattern is evident on the maps for each month in both periods, differences in the magnitude of the values were detected. Plotting these differences permitted the identification of regions with the greatest variations and determination of the anomaly flow between the two periods. A polynomial curve fitted to the seasonal record of the MSLP at 35 selected points for each period allowed identification of temporal variations in MSLP. The main temporal change between the period 1931-60 and the period 1951-80 was a delay in the development of a high pressure over Siberia in the latter period. Changes in horizontal pressure differences (CHPD) between Byelorussia in the Soviet Union and the Sahara Desert related previously described rainfall variations to those pressure variations.
ASJC Scopus subject areas
- Atmospheric Science