Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018

Version 1 : Received: 29 January 2021 / Approved: 2 February 2021 / Online: 2 February 2021 (16:15:53 CET)

How to cite: Wang, Y.; Milinevsky, G.; Evtushevsky, O.; Klekociuk, A.; Han, W.; Grytsai, A.; Antyufeyev, O.; Shi, Y.; Ivaniha, O.; Shulga, V. Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018. Preprints 2021, 2021020093 (doi: 10.20944/preprints202102.0093.v1). Wang, Y.; Milinevsky, G.; Evtushevsky, O.; Klekociuk, A.; Han, W.; Grytsai, A.; Antyufeyev, O.; Shi, Y.; Ivaniha, O.; Shulga, V. Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018. Preprints 2021, 2021020093 (doi: 10.20944/preprints202102.0093.v1).

Abstract

The planetary wave activity in the stratosphere–mesosphere during the Arctic major Sudden Stratospheric Warming (SSW) in February 2018 is discussed on the basis of the microwave radiometer (MWR) measurements of carbon monoxide (CO) above Kharkiv, Ukraine (50.0° N, 36.3° E) and the Aura Microwave Limb Sounder (MLS) measurements of CO, temperature and geopotential heights. From the MLS data, eastward and westward migrations of wave 1/wave 2 spectral components were differentiated, to which less attention was paid in previous studies. Abrupt changes in zonal wave spectra occur with the zonal wind reversal near 10 February 2018. Eastward wave 1 and wave 2, observed before the SSW onset, disappear during the SSW event, when westward wave 1 becomes dominant. Wavelet power spectra of mesospheric CO variations show statistically significant periods in a band of 20–30 days using both MWR and MLS data. Approximately 10-day periods appear only after the SSW onset. Since the propagation of upward planetary waves is limited in the easterly zonal flow in the stratosphere after the zonal wind reversal during SSW, forced planetary waves in the mid-latitude mesosphere may exist due to the instability of the zonal flow.

Subject Areas

planetary wave; mesosphere; stratosphere; major sudden stratospheric warming; mi-crowave radiometer; carbon monoxide; wavelet power spectra

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