Results 81 to 90 of about 1,935 (190)

Finer Vertical Resolution Improves the Sudden Stratospheric Warming Prediction Through Better Representing Planetary Waves

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract Sudden stratospheric warmings (SSWs) strongly impact tropospheric weather, yet their accurate prediction remains a significant challenge. This study investigates the predictability of SSWs in the Whole Atmosphere Community Climate Model with different vertical resolutions.
Huiwen Xiao, Lin Wang, Xi Chen, Adam A. Scaife, Steven C. Hardiman, Nick J. Dunstone, Yuan Liang   +6 more
wiley   +1 more source

Comparison of Key Characteristics of Remarkable SSW Events in the Southern and Northern Hemisphere

Atmosphere, 2020
An exceptionally strong sudden stratospheric warming (SSW) in the Southern Hemisphere (SH) during September 2019 was observed. Because SSW in the SH is very rare, comparison with the only recorded major SH SSW is done.
Michal Kozubek, Jan Lastovicka, Peter Krizan   +2 more
doaj   +1 more source

Elliptical Orbit Representation for the Annual Evolution of the Northern Hemisphere Stratospheric Polar Vortex. Part I: Diagnosing Interannual Variability

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract Using a single annual frequency with each year defined from July 1 to June 30 of the following calendar year, this study fits an ellipse to the yearly phase space trajectory of the daily time series of MU (stratospheric mass‐weighted zonally integrated zonal wind at 60°N) and M (total polar stratospheric air mass over 60–90°N) to represent the
Michael Secor, Jie Sun, Yueyue Yu, Zhaohua Wu, Ming Cai   +4 more
wiley   +1 more source

Mesospheric Precursors to the Major Stratospheric Sudden Warming of 2009: Validation and Dynamical Attribution using a Ground-to-Edge-of-Space Data Assimilation System

Journal of Advances in Modeling Earth Systems, 2011
Global meteorological analyses from an assimilation of operational and research observations spanning the ~0-90~km altitude range confirm earlier tentative suggestions that high-altitude winds throughout the upper mesosphere reversed a week before the ...
Lawrence Coy
doaj   +1 more source

Enhancements of gravity wave amplitudes at midlatitudes during sudden stratospheric warmings in 2008 [PDF]

, 2010
. Two minor and one major stratospheric warming happened in January and February 2008 when the polar vortex was shifted toward midlatitudes. The analysis of temperature profiles from radiosondes in Payerne (Switzerland) during this period reveals an ...
Flury, Thomas, Hocke, Klemens, Kämpfer, Niklaus, Wu, D.L.   +3 more
core   +1 more source

Elliptical Orbit Representation for the Annual Evolution of the Northern Hemisphere Stratospheric Polar Vortex. Part II: Long‐Lead Forecasts of Wintertime S2S Anomalies

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract In Part I, we represent the annual evolution of the Northern Hemisphere stratospheric polar vortex (SPV) in individual years using an ellipse, defined through six ellipse parameters, for the phase‐space trajectory of the daily time series of MU (mass‐weighted zonally integrated zonal wind at 60°N above 400 K) and M (stratospheric air mass over
Michael Secor, Jie Sun, Yueyue Yu, Zhaohua Wu, Ming Cai   +4 more
wiley   +1 more source

Gravity waves excited during a minor sudden stratospheric warming [PDF]

Atmospheric Chemistry and Physics, 2018
An exceptionally deep upper-air sounding launched from Kiruna airport (67.82° N, 20.33° E) on 30 January 2016 stimulated the current investigation of internal gravity waves excited during a minor sudden stratospheric warming (SSW) in the
A. Dörnbrack, S. Gisinger, N. Kaifler, T. C. Portele, M. Bramberger, M. Rapp, M. Rapp, M. Gerding, J. Söder, N. Žagar, D. Jelić   +10 more
doaj   +1 more source

Quasi‐4‐Day Waves During the 2018/2019 SSW and Their Coupling to the Ionosphere Based on Whole Atmosphere Data Assimilation

Space Weather, Volume 24, Issue 3, March 2026.
Abstract A strong westward zonal wavenumber‐2 quasi‐4‐day wave (Q4DW) during the 2018/2019 Northern Hemisphere sudden stratospheric warming (SSW) is both captured by Aura Microwave Limb Sounder (MLS) observations and our new whole neutral atmosphere data assimilation system.
Wenxuan Wang, Xiankang Dou, Sheng‐Yang Gu, Yusong Qin, Yuxuan Liu, Hao Chen, Bao Zhang   +6 more
wiley   +1 more source

Antarctic planetary wave spectrum under different polar vortex conditions in 2019 and 2020 based on total ozone column data

Український антарктичний журнал, 2022
We examine the zonal wavenumber spectrum of planetary (Rossby) waves in the atmosphere above Antarctica in each of two contrasting years: in 2019, when there was a sudden stratospheric warming (SSW), and in 2020 when the Antarctic stratospheric vortex ...
A. Grytsai, G. Milinevsky, Yu. Andrienko, A. Klekociuk, Yu. Rapoport , O. Ivaniha   +5 more
doaj   +1 more source

Modulation of the Mid‐Latitude Ionospheric Sporadic E Layer by the Northern Polar Vortex

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract The sporadic E (Es) layer is a prominent ionospheric irregularity mainly driven by vertical wind shear at mid‐latitudes. Hereby we statistically investigate for the first time Es responses to variations of the northern polar vortex (represented by NAM index) using long‐term ionosonde observations over Japan (44 years) and Australia (34 years).
Tomoki Maeda, Huixin Liu, Yosuke Yamazaki, Lihui Qiu   +3 more
wiley   +1 more source