Variability of Jet Streams in the Atmosphere of the Northern Hemisphere in Recent Decades (1980–2021)

Е. А. Bezotecheskaya; Безотеческая Е. А.; О. G. Chkhetiani; Чхетиани О. Г.; I. I. Mokhov; Мохов И. И.

doi:10.31857/S0002351523030021

Variability of Jet Streams in the Atmosphere of the Northern Hemisphere in Recent Decades (1980–2021)

Authors: Bezotecheskaya Е.А.¹^,2, Chkhetiani О.G.¹, Mokhov I.I.¹^,3
Affiliations:
1. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences
2. Arctic and Antarctic Research Institute
3. Lomonosov Moscow State University
Issue: Vol 59, No 3 (2023)
Pages: 265-274
Section: Articles
URL: https://journals.rcsi.science/0002-3515/article/view/136903
DOI: https://doi.org/10.31857/S0002351523030021
EDN: https://elibrary.ru/TNGRAK
ID: 136903

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Abstract
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Abstract

Based on the reanalysis data quantitative estimates of the kinetic energy of the high-altitude jet streams of the Northern Hemisphere (E_K JS NH) and its changes in the annual cycle and interannual variability for the period 1980–2021 were obtained under different conditions for the minimum wind speed V_m in the JS area. Adequate estimates are made for the share of the total kinetic energy of the atmosphere of the Northern Hemisphere associated with JS (P_Eк JS). The share of the volume of atmospheric layers in the JS area in the NH in the total analyzed atmospheric layer of 500–100 hPa (P_V JS) was also estimated. Significant changes were noted in summer including significant weakening trends of E_К, P_Eк and P_V in July and August at V_m ≥ 20 and V_m ≥ 30 m/s. In winter significant changes were noted only for P_V – a decreasing trend at V_m ≥ 20 and V_m ≥ 30 m/s. Seasonal features of JS connection with El Niño phenomena are noted which are most significantly manifested from January to April.

Keywords

climate variability, atmospheric circulation, high-altitude jet streams, El Niño phenomena, observational and reanalysis data

References

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