Dynamical coupling of the stratosphere and mesosphere in the 2002 Southern Hemisphere major stratospheric sudden warming

Liu, Hanli; Roble, R. G.

doi:10.1029/2005gl022939

Cited by 70 publications

(61 citation statements)

References 12 publications

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“…In a recent study, using the NCEP/NCAR data and the TIME-GCM, the dynamical changes in the mesosphere and the stratosphere were analyzed for the Southern Hemisphere SSW event of 2002 and a strong feedback taking place between the PWs and the mean dynamics of the mesosphere and stratosphere was shown (Liu and Roble, 2005). This study indicated that the PW surf zone descends from the mesospheric to the stratospheric altitudes in the preconditioning phase of the SSW.…”

Section: Resultsmentioning

confidence: 99%

“…There had not been enough experimental evidences for such a connection till date. However, some of the recent studies discussing the dynamical changes in the lower atmosphere over the northern high latitude regions not only indicate the presence of a zero wind line but also discuss about significance in context of the propagation of PWs (Baldwin and Dunkerton, 1999;Walterscheid et al, 2000;Coughlin and Tung, 2005;Liu and Roble, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Tropical connection to the polar stratospheric sudden warming through quasi 16-day planetary wave

et al. 2010

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Abstract. The Planetary Waves (PWs) are believed to have significant role in generating the wintertime warming over the polar stratosphere, known as Stratospheric Sudden Warming (SSW). However, the origin, characteristics and evolution of these waves are still speculative. The possibility that the PWs over the polar stratosphere, which play an important role in the generation of SSW, could also have contribution from the tropics has been indicated through many numerical simulations in the past, but due to the paucity of global measurements it could not be established unequivocally. The earlier numerical studies also indicated the presence of a zero-wind line (more general the critical layer, where the zonal wind amplitude becomes zero) whose real counterparts were not observed in the atmosphere. The present study based on the NCEP/NCAR reanalysis of stratospheric wind and temperatures of recent years clearly shows that (i) the zero-wind line appears over the tropics ∼60 days prior to the major SSWs and progresses towards the Pole and (ii) an enhanced PW activity of quasi periodicity 16-days, which is also seen almost simultaneously with the zero-wind line, shows a propagation from equator to the Pole. This result is significant as it presents for the first time the connection between the tropics during the SSW events and the pole, through the quasi 16-day wave.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tropical connection to the polar stratospheric sudden warming through quasi 16-day planetary wave

et al. 2010

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“…In the winter hemisphere, the stratospheric and MLT temperature and wind at high-and mid-latitudes can undergo significant changes before, during, and after the occurrence of a SSW (e.g., Walterscheid et al, 2000;Cho and Shepherd, 2004;Liu and Roble, 2005). These changes can range from the zonal mean wind reversal (Dowdy et al, 2004) to the cooling of the MLT temperature (Hernandez, 2003;Liu and Roble, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Liu and Roble (2005) used a Global Circulation Model (GCM) extending from 30 to 500 km to examine the interaction between planetary wave forcing and the evolving zonal mean state during the same event. They found significant mesospheric effects which include a cooling and reversal of the zonal wind prior to the SSW event.…”

Section: Link With Temperature Variationsmentioning

confidence: 99%

“…These changes can range from the zonal mean wind reversal (Dowdy et al, 2004) to the cooling of the MLT temperature (Hernandez, 2003;Liu and Roble, 2005). Dowdy et al (2004) used three medium frequency (MF) radars located at Davis (69 • S, 78 • W), Syowa (69 • S, 40 • W) and Rothera (68 • S, 68 • W) to study the dynamics of the MLT during the SH 2002 SSW.…”

Section: Introductionmentioning

confidence: 99%

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Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements

Mbatha

Sivakumar

Malinga³

et al. 2010

Atmos. Chem. Phys.

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The occurrence of a sudden stratospheric warming (SSW) excites disturbances in the mesosphere-lower thermospheric (MLT) wind and temperature. Here, we have examined the high frequency (HF) radar wind data from the South African National Antarctic Expedition, SANAE (72° S, 3° W), a radar which is part of the Super Dual Auroral Radar Network (SuperDARN). Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) on board the Thermosphere-Ionosphere-Mesosphere-Energetics and Dynamics (TIMED) satellite temperature data and National Centre for Environmental Prediction (NCEP) temperature and wind data are used to investigate the dynamical effects of the unprecedented September 2002 SSW in the Antarctica stratosphere and MLT. The mean zonal wind (from SANAE HF radar) at the MLT shows reversal approximately 7 days before the reversal at 10 hPa (from NCEP). This indicates that there was a downwards propagation of circulation disturbance. Westerly zonal winds dominate the winter MLT, but during the 2002 winter there are many periods of westward winds observed compared to other years. The normalised power spectrums of both meridional and zonal winds show presence of planetary waves (of ~14-day period) before the occurrence of the SSW. The SABER vertical temperature profiles indicated the cooling of the MLT region before the SSW event

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Study of the thermospheric and ionospheric response to the 2009 sudden stratospheric warming using TIME‐GCM and GSM TIP models: First results

Клименко

Бессараб

et al. 2015

JGR Space Physics

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This paper presents a study of mesosphere and low thermosphere influence on ionospheric disturbances during 2009 major sudden stratospheric warming (SSW) event. This period was characterized by extremely low solar and geomagnetic activity. The study was performed using two first principal models: thermosphere-ionosphere-mesosphere electrodynamics general circulation model (TIME-GCM) and global self-consistent model of thermosphere, ionosphere, and protonosphere (GSM TIP). The stratospheric anomalies during SSW event were modeled by specifying the temperature and density perturbations at the lower boundary of the TIME-GCM (30 km altitude) according to data from European Centre for Medium-Range Weather Forecasts. Then TIME-GCM output at 80 km was used as lower boundary conditions for driving GSM TIP model runs. We compare models' results with ground-based ionospheric data at low latitudes obtained by GPS receivers in the American longitudinal sector. GSM TIP simulation predicts the occurrence of the quasi-wave vertical structure in neutral temperature disturbances at 80-200 km altitude, and the positive and negative disturbances in total electron content at low latitude during the 2009 SSW event. According to our model results the formation mechanisms of the low-latitude ionospheric response are the disturbances in the n(O)/n(N 2) ratio and thermospheric wind. The change in zonal electric field is key mechanism driving the ionospheric response at low latitudes, but our model results do not completely reproduce the variability in zonal electric fields (vertical plasma drift) at low latitudes. Although importance of PW in generating ionospheric disturbances during SSW is suggested in early studies [Goncharenko et al., 2010a, 2010b; Pedatella and Forbes, 2010; Fejer et al., 2011], exact mechanisms are a subject of active research due to a variety and complexity of interactions of planetary waves with tides, gravity waves, and mean flow. Several mechanisms can modify thermospheric tides and through E region dynamo generate KLIMENKO ET AL.

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Dynamical coupling of the stratosphere and mesosphere in the 2002 Southern Hemisphere major stratospheric sudden warming

Cited by 70 publications

References 12 publications

Tropical connection to the polar stratospheric sudden warming through quasi 16-day planetary wave

Tropical connection to the polar stratospheric sudden warming through quasi 16-day planetary wave

Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements

Study of the thermospheric and ionospheric response to the 2009 sudden stratospheric warming using TIME‐GCM and GSM TIP models: First results

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