The influence of the North Atlantic and East Atlantic oscillations on the variability of the hydrogen index in the Black Sea surface layer

by

A.B. Polonsky, E.A. Grebneva

Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

E-mail: apolonsky5@mail.ru

 

DOI: 10.33075/2220-5861-2026-1-08-22

UDC 551.465.7:551.510.52                                        

EDN: https://elibrary.ru/aeleqd

Abstract:     

The influence of the North Atlantic (NAO) and East Atlantic ocillations (EAO) on the spatiotemporal variability of pH in the surface layer of the Black Sea has been analyzed using regular data from the Black Sea reanalysis with a biogeochemical block, available over approximately 30 years. This made it possible to obtain much more detailed and reliable patterns of the impact of these large-scale atmospheric interannual modes on the acidity index of the Black Sea waters compared with those described in the earlier works. A significant effect of the NAO and EAO on the spatiotemporal variability of the hydrogen index in the Black Sea was revealed, both quasi-synchronous and with a characteristic time delay of the pH fields relative to the indices of these oscillations up to 4 months. One of the main mechanisms of the impact of variations in atmospheric characteristics on the spatio-temporal structure of the pH field in the surface layer, due to the response of the hydrogen index to anomalies of the spatially inhomogeneous wind field and related circulation features of the Black Sea, is described in detail. It has been shown that, in general, the EAO has a more significant effect on the characteristics of the pH field than the NAO.

Keywords: Black Sea, hydrogen index (pH), North Atlantic Oscillation (NAO), East Atlantic Oscillation (EAO), spatial and temporal variability, biogeochemical reanalysis, Rim Black Sea Current, circulation of the Black Sea waters

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