Variability of the North Atlantic Subtropical High during the months of November to April from 1950 to 2019
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Abstract
The North Atlantic Subtropical High predominates over a very wide region of the northern hemisphere and is a fundamental system of the general circulation of the atmosphere. It is considered a governing system of the meteorological systems in the Atlantic basin and therefore it intervenes in the behavior of tropical systems. Therefore, the present work aims to characterize and analyze its variability. The monthly database of the National Center for Environmental Prediction and the National Center for Atmospheric Research of the United States Oceanic and Atmospheric Administration was consulted for the months of November to April 1950-2019. The central pressure of the subtropical high at the surface was determined from the value of the closed isobar closest to the center and by means of this; its mean position was estimated. Another element analyzed at the surface was its strength, based on the average position it occupies during the low rainfall period of the year. On the other hand, the value of the geopotential and the position of the high center at 850 hPa and the geopotential at 500 hPa and 200 hPa were obtained and analyzed, since these are representative levels of the atmospheric circulation in the lower and middle troposphere. The results showed that the North Atlantic Subtropical High has presented few morphological variations; however, it has modified its intensity and has shifted to the east-northeast with respect to its average position.
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