North Atlantic Oscillation and Variations of Geomagnetic Field

Authors

  • Natalya Kilifarska Climate, Atmosphere and Water Research Institute, Bulgarian Academy of Sciences
  • Antonia Mokreva Climate, Atmosphere and Water Research Institute, Bulgarian Academy of Sciences
  • Tsvetelina Velichkova Climate, Atmosphere and Water Research Institute, Bulgarian Academy of Sciences

DOI:

https://doi.org/10.7546/CRABS.2022.11.10

Keywords:

North Atlantic Oscillation, sea-level pressure, geomagnetic field, lower stratospheric ozone

Abstract

The North Atlantic Oscillation is one of the most influential climatic modes in the Northern Hemisphere. However, the mechanism(s) standing behind its wide spectra of variations is still unknown despite its numerous investigations. This paper presents evidence for a synchronization between secular variations of geomagnetic field intensity and NAO long-term variability. Analysis of the connectivity between geomagnetic secular variations and the sea-level pressure – point by point, in a grid with resolution 10 [deg] in latitude and longitude – reveals that the strength of their relation is unevenly distributed over the Northern Hemisphere. Based on the machine learning analysis over the period 1900–2019, we found that there are two centres of significant geomagnetic-pressure relations – the weaker of them is placed slightly north of Iceland, and the stronger one is in a close proximity to Azores islands. The suggested mechanism for geomagnetic influence on the near surface climatic conditions includes the geomagnetic modulation of energetic particles precipitating in Earth's atmosphere, and their impact on the lower stratospheric ozone. The analysis of ozone-pressure relation shows, in addition, reasonable similarities with the spatial patterns of geomagnetic-pressure relations.

Author Biographies

Natalya Kilifarska, Climate, Atmosphere and Water Research Institute, Bulgarian Academy of Sciences

Mailing Address:
Climate, Atmosphere and Water Research Institute,
Bulgarian Academy of Sciences
66 Tsarigradsko Shosse Blvd
1784 Sofia, Bulgaria

E-mail: natalya_kilifarska@yahoo.co.uk

Antonia Mokreva, Climate, Atmosphere and Water Research Institute, Bulgarian Academy of Sciences

Mailing Address:
Climate, Atmosphere and Water Research Institute,
Bulgarian Academy of Sciences
66 Tsarigradsko Shosse Blvd
1784 Sofia, Bulgaria

E-mail: antmokreva@gmail.com

Tsvetelina Velichkova, Climate, Atmosphere and Water Research Institute, Bulgarian Academy of Sciences

Mailing Address:
Climate, Atmosphere and Water Research Institute,
Bulgarian Academy of Sciences
66 Tsarigradsko Shosse Blvd
1784 Sofia, Bulgaria

E-mail: tsvetelinavelichkova@abv.bg

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Published

30-11-2022

How to Cite

[1]
N. Kilifarska, A. Mokreva, and T. Velichkova, “North Atlantic Oscillation and Variations of Geomagnetic Field”, C. R. Acad. Bulg. Sci., vol. 75, no. 11, pp. 1628–1637, Nov. 2022.

Issue

Section

Geophysics