University of Oulu

Salminen, A., Asikainen, T., & Mursula, K. (2022). Planetary waves controlling the effect of energetic electron precipitation on the northern polar vortex. Geophysical Research Letters, 49, e2021GL097076.

Planetary waves controlling the effect of energetic electron precipitation on the northern polar vortex

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Author: Salminen, Antti1; Asikainen, Timo1; Mursula, Kalevi1
Organizations: 1Space Climate Group, Space Physics and Astronomy Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.8 MB)
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Language: English
Published: American Geophysical Union, 2022
Publish Date: 2022-05-03


Energetic electron precipitation (EEP) forms ozone-depleting nitrogen and hydrogen oxides in the high-latitude middle and upper atmosphere, leading to ozone destruction and temperature enhancement that can strengthen the winter polar vortex. This EEP effect on polar vortex depends on quasi-biennial oscillation and sudden stratospheric warmings, which earlier studies relate to planetary waves. We study here the possible modulation of the EEP effect by planetary waves. We perform a principal component analysis of the vertical component of Eliassen-Palm flux (EP flux) to examine the latitudinal pattern of planetary waves. We use a multilinear regression analysis to estimate the responses of zonal wind and EP flux divergence to EEP in the northern winter stratosphere by keeping the two leading principal components of vertical EP flux as controlling factors. We find that the EEP strengthens the polar vortex most systematically when planetary wave propagation is enhanced at mid-latitudes but reduced at polar latitudes.

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Series: Geophysical research letters
ISSN: 0094-8276
ISSN-E: 1944-8007
ISSN-L: 0094-8276
Volume: 49
Article number: e2021GL097076
DOI: 10.1029/2021GL097076
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: We acknowledge the financial support by the Academy of Finland to the PROSPECT (project no. 321440) and by the Kvantum institute of the University of Oulu (CAESAR project). Antti Salminen acknowledges the funding from the Finnish Cultural Foundation (grant no. 00200976).
Academy of Finland Grant Number: 321440
Detailed Information: 321440 (Academy of Finland Funding decision)
Copyright information: © 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.