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

• Published in: Izvestiya. Atmospheric and oceanic physics 2023-06, Vol.59 (3), p.224-232
• Main Authors: Bezotecheskaya, E. A., Chkhetiani, O. G., Mokhov, I. I.
• Format: Article
• Language: English
• Subjects: Annual variations; Atmosphere; Climatology; Earth and Environmental Science; Earth Sciences; El Nino; El Nino phenomena; Estimates; Geophysics/Geodesy; High altitude; Interannual variability; Jet stream; Jet streams (meteorology); Kinetic energy; Northern Hemisphere; Rivers; Streams; Wind speed; Wind velocities
• ISSN: 0001-4338; 1555-628X
• DOI: 10.1134/S0001433823030027

Based on 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 1980–2021 have been obtained under different conditions for the minimum wind velocity 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 the JS ( 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 the summer, including significant weakening trends of E K , , 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 the JS connection with El Niño phenomena are noted that are most significantly manifested from January to April.