TY - JOUR

T1 - Natural Tropical Oscillations phase impact on stationary and westward travelling planetary waves

AU - Диденко, Ксения Андреевна

AU - Коваль, Андрей Владиславович

AU - Ермакова, Татьяна Сергеевна

AU - Фадеев, Алексей Сергеевич

AU - Xu, Luyang

AU - Wei, Ke

N1 - Didenko, K. A., Koval, A. V., Ermakova, T. S., Fadeev, A. S., Xu, L., and Wei, K.: Natural Tropical Oscillations phase impact on stationary and westward travelling planetary waves, Atmos. Chem. Phys., 25, 13799–13813, https://doi.org/10.5194/acp-25-13799-2025, 2025.

PY - 2025/10/27

Y1 - 2025/10/27

N2 - We performed a series of numerical experiments to study the main patterns of the Quasi-BiennialOscillation phase of the zonal wind in the equatorial stratosphere (QBO) and the El Niño-Southern Oscillation(ENSO) influence on stationary and westward travelling atmospheric planetary waves (PWs) with different zonalwave numbers and periods. The simulation was carried out for boreal winter conditions using the Middle andUpper Atmosphere Model (MUAM). The results showed that the joint effect of the considered tropical oscillationscan significantly up to tens of percent change the amplitudes of the PW in the areas of their maxima.Under the El Niño regardless of the QBO phase the amplitude maxima of the stationary PW with wave number1 (SPW1) shift toward high latitudes. The amplitude structure of SPW2 is basically opposite to the SPW1 structure.Increases of the upward wave activity fluxes of quasi- 5, 10, 7 d PWs, as well as the amplitudes of 10 and7 d PWs are modelled when easterly QBO phase is superimposed on El Niño phase. Conversely, attenuationsof the individual PW amplitudes and wave activity fluxes are typically observed under the westerly QBO, aswell as under La-Niña/westerly QBO conditions combination in special cases, such as SPW1. The PW study isimportant due to their significant influence on the middle and upper atmosphere circulation, including the configurationof the stratospheric polar vortex whose deformation can influence the occurrence of extreme weatherevents, in particular, in the Arctic and Asia-Pacific region during the boreal winter.

AB - We performed a series of numerical experiments to study the main patterns of the Quasi-BiennialOscillation phase of the zonal wind in the equatorial stratosphere (QBO) and the El Niño-Southern Oscillation(ENSO) influence on stationary and westward travelling atmospheric planetary waves (PWs) with different zonalwave numbers and periods. The simulation was carried out for boreal winter conditions using the Middle andUpper Atmosphere Model (MUAM). The results showed that the joint effect of the considered tropical oscillationscan significantly up to tens of percent change the amplitudes of the PW in the areas of their maxima.Under the El Niño regardless of the QBO phase the amplitude maxima of the stationary PW with wave number1 (SPW1) shift toward high latitudes. The amplitude structure of SPW2 is basically opposite to the SPW1 structure.Increases of the upward wave activity fluxes of quasi- 5, 10, 7 d PWs, as well as the amplitudes of 10 and7 d PWs are modelled when easterly QBO phase is superimposed on El Niño phase. Conversely, attenuationsof the individual PW amplitudes and wave activity fluxes are typically observed under the westerly QBO, aswell as under La-Niña/westerly QBO conditions combination in special cases, such as SPW1. The PW study isimportant due to their significant influence on the middle and upper atmosphere circulation, including the configurationof the stratospheric polar vortex whose deformation can influence the occurrence of extreme weatherevents, in particular, in the Arctic and Asia-Pacific region during the boreal winter.

UR - https://www.mendeley.com/catalogue/9111d101-546a-3b21-af1d-94f4707554d5/

U2 - 10.5194/acp-25-13799-2025

DO - 10.5194/acp-25-13799-2025

M3 - Article

VL - 25

SP - 13799

EP - 13813

JO - Atmospheric Chemistry and Physics

JF - Atmospheric Chemistry and Physics

SN - 1680-7316

IS - 20

ER -