Longitudinal peculiarities of planetary waves-zonal flow interactions and their role in stratosphere-troposphere dynamical coupling

2021 ◽  
Author(s):  
Ke Wei ◽  
Jiao Ma ◽  
Wen Chen ◽  
Pavel Vargin
Keyword(s):  
Zonal Flow ◽  
Planetary Waves ◽  
Flow Interactions ◽  
Dynamical Coupling

Multiple Timescales of the Southern Annular Mode

2021 ◽  
Author(s):  
Qiuyan Zhang ◽  
Yang Zhang ◽  
Zhaohua Wu
Keyword(s):  
Seasonal Variability ◽  
Low Frequency ◽  
Austral Summer ◽  
Zonal Flow ◽  
Southern Annular Mode ◽  
Multiple Timescales ◽  
Annular Mode ◽  
Flow Interactions ◽  
The Cross ◽  
Sst Anomalies

<p>Using the ensemble empirical mode decomposition (EEMD) method, this study systematically investigates the multiple timescales of the Southern Annular Mode (SAM) and identifies their relative contributions to the low-frequency persistence of SAM. Analyses show that the subseasonal sustaining of SAM mainly depends on the contribution of longer-timescale variabilities, especially the cross-seasonal variability. When subtracting the cross-seasonal variability from the SAM, the positive covariance between the eddy and zonal flow, which is suggested the positive eddy feedback in SAM, disappears. Composite analysis shows that only with strong cross-seasonal variability, the meridional shift of zonal wind, eddy momentum forcing and baroclinicity anomalies can be maintained for more than 20 days, mainly resulting from the longer-timescale (especially the cross-seasonal timescale) eddy-zonal flow interactions. This study further suggests that the dipolar sea surface temperature (SST) anomalies in the mid latitude of Southern Hemisphere (SH) is a possible cause for the cross-seasonal variability. Analysis shows that about half of the strong cross-seasonal timescale events are accompanied by evident dipolar SST anomalies, which mostly occur in austral summer. The cross-seasonal dependence of the eddy-zonal flow interactions suggests the longer-timescale (especially the cross-seasonal timescale) contribution cannot be neglected in subseasonal prediction of SAM.</p>

scholarly journals Generation of Zonal Flow and Magnetic Field by Planetary Waves in the Earth’s Ionosphere

2016 ◽  
Vol 04 (02) ◽  
pp. 487-491
Author(s):  
T. D. Kaladze ◽  
Kh. Chargazia ◽  
O. Kharshiladze ◽  
L. V. Tsamalashvili
Keyword(s):  
Magnetic Field ◽  
Zonal Flow ◽  
Planetary Waves

Excitation of zonal flow and magnetic field by Rossby–Khantadze electromagnetic planetary waves in the ionospheric E-layer

2012 ◽  
Vol 19 (2) ◽  
pp. 022902 ◽  
Author(s):  
T. D. Kaladze ◽  
L. Z. Kahlon ◽  
L. V. Tsamalashvili
Keyword(s):  
Magnetic Field ◽  
Zonal Flow ◽  
Planetary Waves

scholarly journals Energy exchanges in Saturn's polar regions from Cassini observations: Part I: Eddy-zonal flow interactions

2021 ◽  
Author(s):  
Peter L Read ◽  
Arrate Antuñano ◽  
Greg Colyer ◽  
Simon Cabanes ◽  
Teresa del Rio-Gaztelurrutia ◽  
...  
Keyword(s):  
Zonal Flow ◽  
Polar Regions ◽  
Flow Interactions ◽  
Energy Exchanges

Climatic trends in temperature, zonal flow, and stationary planetary waves from NCEP/NCAR reanalysis data

2007 ◽  
Vol 43 (6) ◽  
pp. 696-704 ◽  
Author(s):  
A. Yu. Kanukhina ◽  
L. A. Nechaeva ◽  
E. V. Suvorova ◽  
A. I. Pogorel’tsev
Keyword(s):  
Zonal Flow ◽  
Reanalysis Data ◽  
Planetary Waves ◽  
Climatic Trends

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

2021 ◽  
Vol 13 (6) ◽  
pp. 1190
Author(s):  
Yuke Wang ◽  
Gennadi Milinevsky ◽  
Oleksandr Evtushevsky ◽  
Andrew Klekociuk ◽  
Wei Han ◽  
...  
Keyword(s):  
Planetary Wave ◽  
Microwave Radiometer ◽  
Wave Spectrum ◽  
Power Spectra ◽  
Zonal Flow ◽  
Planetary Waves ◽  
The Arctic ◽  
Stratospheric Warming ◽  
Sudden Stratospheric Warming ◽  
Stratospheric Dynamics

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 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 occurred with the zonal wind reversal near 10 February 2018. Eastward wave 1 and wave 2 were observed before the SSW onset and disappeared during the SSW event, when westward wave 1 became dominant. Wavelet power spectra of mesospheric CO variations showed statistically significant periods of 20–30 days using both MWR and MLS data. Although westward wave 1 in the mesosphere dominated with the onset of the SSW 2018, it developed independently of stratospheric dynamics. Since the propagation of upward planetary waves was limited in the easterly zonal flow in the stratosphere during SSW, forced planetary waves in the mid-latitude mesosphere may exist due to the instability of the zonal flow.

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