The large‐scale dynamics of the mesosphere–lower thermosphere during the Southern Hemisphere stratospheric warming of 2002

Dowdy, Andrew J.; Vincent, R. A.; Murphy, D. J.; Tsutsumi, Masaki; Riggin, D. M.; Jarvis, M. J.

doi:10.1029/2004gl020282

Cited by 77 publications

(124 citation statements)

References 15 publications

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“…This wave breaking led to the cooling of the MLT and also the reversal of the mean circulation in the MLT in late September 2002 (Dowdy et al, 2004;Mbatha et al, 2010). This finding is consistent with the work published by Ratnam et al (2004), who studied the enhancement of GW activity observed during the Southern Hemisphere stratospheric warming by Challenging Minisatellite Payload (CHAMP) global positioning system (GPS) measurements at high latitude region.…”

Section: Gws Parameterssupporting

confidence: 81%

“…This behaviour indicates that there may be a downward propagation of circulation disturbance in the middle atmosphere. Similar results were also reported by Dowdy et al (2004). In this study, the GW phase speeds calculated from SANAE imaging riometer are also plotted against the MLT and stratospheric zonal wind.…”

Section: Gws Parameterssupporting

confidence: 65%

“…During this event the polar vortex also split, causing the normally quiescent Antarctica ozone hole to also split into two parts (Baldwin et al, 2003;Bencherif et al, 2007). The details of the dynamics of the 2002 stratospheric warming has been reported by authors such as Baldwin et al (2003), Dowdy et al (2004), Ren et al (2008), Mbatha et al (2010) and Azeem et al (2010).…”

Section: Uk Met Office Datamentioning

confidence: 89%

“…In their study, they showed that the potential energy of GWs seems to decrease during the major SSW occurrence period in the height region between 25 and 30 km. This may be due to the interaction between GW and the dominant planetary waves of a period of 10-16 days which was observed in the stratosphere during the 2002 winter (Baldwin et al, 2003;Dowdy et al, 2004).…”

Section: Gws Parametersmentioning

confidence: 99%

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Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer

Mbatha

Sivakumar

Benchérif³

et al. 2013

Ann. Geophys.

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Abstract. Using absorption data measured by imaging riometer for ionospheric studies (IRIS) located at the South Africa National Antarctic Expedition (SANAE), Antarctica (72 • S, 3 • W), we extracted the parameters of gravity waves (GW) of periods between 40 and 50 min during late winter/spring of the year 2002, a period of the unprecedented major sudden stratospheric warming (SSW) in the Southern Hemisphere middle atmosphere. During this period, an unprecedented substantial increase of temperature by about 25-30 K throughout the stratosphere was observed. During the period of the occurrence of the major stratospheric warming, there was a reduction of both the GW horizontal phase speeds and the horizontal wavelengths at 90 km. The GW phase speeds and horizontal wavelengths were observed to reach minimum values of about 7 m s −1 and 19 km, respectively, while during the quiet period the average value of the phase speed and horizontal wavelength was approximately 23 m s −1 and 62 km, respectively. The observed event is discussed in terms of momentum flux and also a potential interaction of gravity waves, planetary waves and mean circulation.

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Section: Gws Parameterssupporting

confidence: 81%

Section: Gws Parameterssupporting

confidence: 65%

Section: Uk Met Office Datamentioning

confidence: 89%

Section: Gws Parametersmentioning

confidence: 99%

See 2 more Smart Citations

Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer

Mbatha

Sivakumar

Benchérif³

et al. 2013

Ann. Geophys.

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“…The wintertime eastward wind is slightly stronger (10-15 ms −1 ) at Mawson between 80 and 98 km than that observed at Rothera (5-10 ms −1 ). (Dowdy et al, 2001(Dowdy et al, , 2004Kishore et al, 2003). At 80 km altitude both sites see a reversal of the mean wind field in mid March and early October as seen at Rothera.…”

Section: Comparison With Other Southern Hemisphere Sitesmentioning

confidence: 85%

Seasonal variations in the horizontal wind structure from 0-100 km above Rothera station, Antarctica (67° S, 68° W)

et al. 2005

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Abstract.A medium frequency spaced-antenna radar has been operating at Rothera station, Antarctica (67 • S, 68 • W) for two periods, between 1997-1998 and since 2002, measuring winds in the mesosphere and lower thermosphere. In this paper monthly mean winds are derived and presented along with three years of radiosonde balloon data for comparison with the HWM-93 model atmosphere and other high latitude southern hemisphere sites. The observed meridional winds are slightly more northwards than those predicted by the model above 80 km in the winter months and below 80 km in summer. In addition, the altitude of the summer time zero crossing of the zonal winds above the westward jet is overestimated by the model by up to 8 km. These data are then merged with the wind climatology obtained from falling sphere measurements made during the PORTA campaign at Rothera in early 1998 and the HWM-93 model atmosphere to generate a complete zonal wind climatology between 0 and 100 km as a benchmark for future studies at Rothera. A westwards (eastwards) maximum of 44 ms −1 at 67 km altitude occurs in mid December (62 ms −1 at 37 km in mid July). The 0 ms −1 wind contour reaches a maximum altitude of 90 km in mid November and a minimum altitude of 18 km in January extending into mid March at 75 km and early October at 76 km.

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The climatology of zonal wave numbers 1 and 2 planetary wave structure in the MLT using a chain of Northern Hemisphere SuperDARN radars

Kleinknecht

Hibbins²

2014

JGR Atmospheres

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The zonal wave components 1 and 2 were extracted from the meridional wind along the latitude band of 51–66°N for the years 2000–2008 using eight Super Dual Auroral Radar Network (SuperDARN) radars spanning longitudes from 25°E to 150°W. Each extracted zonal component represents the superposition of all temporal periods with that zonal structure and indicates the total planetary wave energy available with that wave number. The Hovmöller diagrams show stationary as well as eastward and westward traveling planetary waves propagating in the background wind. The method used to detect the zonal planetary wave components in the SuperDARN data are detailed and validated using UK Meteorological Office data, which allows the evolution of S1 and S2 planetary wave energy between the stratosphere and mesosphere to be assessed. The climatology of zonal wave number 1 and 2 planetary wave activity in the mesosphere‐lower thermosphere (MLT) is presented and compared to the activity in the stratosphere. The MLT climatology of the mean wind anomalies shows stronger planetary wave activity during winter and weaker activity during summer with enhancement around midsummer and autumn equinox. The climatology of the mean wind displays similar amplitudes apart from very strong S1 planetary wave amplitudes during summer. In addition planetary wave activity during winters with major and minor stratospheric warming events are examined and contrasted.

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The large‐scale dynamics of the mesosphere–lower thermosphere during the Southern Hemisphere stratospheric warming of 2002

Cited by 77 publications

References 15 publications

Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer

Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer

Seasonal variations in the horizontal wind structure from 0-100 km above Rothera station, Antarctica (67° S, 68° W)

The climatology of zonal wave numbers 1 and 2 planetary wave structure in the MLT using a chain of Northern Hemisphere SuperDARN radars

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