The 4‐day wave in the Antarctic mesosphere

Lawrence, Bryan; Fraser, G. J.; Vincent, R. A.; Phillips, A.

doi:10.1029/95jd01168

Cited by 24 publications

(24 citation statements)

References 21 publications

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“…These findings agree well with previous observations related to warm pools and their phase velocities (e.g. Lawrence et al, 1995). However, the phenomenon of a moving warm pool could also be interpreted as a structure in the temperature field moving with the background wind.…”

Section: Wave Activity In Wintersupporting

confidence: 90%

“…Similar to the studies by Nozawa et al (2003b), the wave's amplitude was reported to maximize at lower altitudes (approximately 70 km) than the summer QTDW (85-88 km). Lawrence et al (1995) used radar observations together with stratospheric analyses to show that a four-day wave can reach to the Antarctic upper mesosphere. The study confirmed that the wave is associated with quasi-non-dispersive warm pools that rotate in the polar vortex.…”

Section: Introductionmentioning

confidence: 99%

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Short-period planetary waves in the Antarctic middle atmosphere

Baumgaertner

McDonald

Hibbins

et al. 2008

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Wave Activity In Wintersupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Short-period planetary waves in the Antarctic middle atmosphere

Baumgaertner

McDonald

Hibbins

et al. 2008

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Previous works (Venne and Stanford, 1982;Lait and Stanford, 1988;Lawrence et al, 1995) have described the presence of waves in the Southern Hemisphere mesosphere and stratosphere with zonal wave numbers one to three and periods of 4, 1.8 and 1.2 days. This 4-day wave is an eastward propagating disturbance with a zonal wave number one.…”

Section: A Mechanism For the Observed Seasonal Behaviormentioning

confidence: 99%

Transient eastward-propagating long-period waves observed over the South Pole

et al. 1998

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Abstract. Observations of the horizontal wind ®eld over the South Pole were made during 1995 using a meteor radar. These data have revealed the presence of a rich spectrum of waves over the South Pole with a distinct annual occurrence. Included in this spectrum are longperiod waves, whose periods are greater than one solar day, which are propagating eastward. These waves exhibit a distinct seasonal occurrence where the envelope of wave periods decreases from a period of 10 days near the fall equinox to a minimum of 2 days near the winter solstice and then progresses towards a period near 10 days at the spring equinox. Computation of the meridional gradient of quasi-geostrophic potential vorticity has revealed a region in the high-latitude upper mesosphere which could support an instability and serve as a source for these waves. Estimation of the wave periods which would be generated from an instability in this region closely resembles the observed seasonal variation in wave periods over the South Pole. These results are consistent with the hypothesis that the observed eastward propagating long-period waves over the South Pole are generated by an instability in the polar upper mesosphere. However, given our limited data set we cannot rule out a stratospheric source. Embedded in this spectrum of eastward propagating waves during the austral winter are a number of distinct wave events. Eight such wave events have been identi®ed and localized using a constant-®lter bank. The periods of these wave events ranges from 1.7 to 9.8 days and all exist for at least 3 wave periods. Least squares analysis has revealed that a number of these events are inconsistent with a wave propagating zonally around the geographic pole and could be related to waves propagating around a dynamical pole which is o set from the geographic pole. Additionally, one event which was observed appears to be a standing oscillation.

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“…The E1 5DW was also found in the meridional wind as a winter phenomenon using meteor radar wind measurements at the South Pole during 1995 by Palo et al (1998). Simulation using the extended Canadian Middle Atmosphere Model (CMAM) by McLandress et al (2006) predicted E1 quasi-4-day wave during austral winter between 63 and 85 • S, as observed by Lawrence et al (1995), Prata (1984) and Stanford (1979, 1982), although Hough function theory predicts that the quasi-4-day wave corresponds to (2, 1) (Hirota and Hirooka, 1984;Salby, 1984;Talaat et al, 2002). Discrepancies between our results and previous 5DW studies from groundbased radar measurements introduced above may also be a longitude variability caused by a mixture of these different wave modes.…”

Section: Discussionmentioning

confidence: 83%

Interhemispheric structure and variability of the 5-day planetary wave from meteor radar wind measurements

et al. 2015

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Abstract.A study of the quasi-5-day wave (5DW) was performed using meteor radars at conjugate latitudes in the Northern and Southern hemispheres. These radars are located at Esrange, Sweden (68 • N) and Juliusruh, Germany (55 • N) in the Northern Hemisphere, and at Tierra del Fuego, Argentina (54 • S) and Rothera Station, Antarctica (68 • S) in the Southern Hemisphere. The analysis was performed using data collected during simultaneous measurements by the four radars from June 2010 to December 2012 at altitudes from 84 to 96 km. The 5DW was found to exhibit significant short-term, seasonal, and interannual variability at all sites. Typical events had planetary wave periods that ranged between 4 and 7 days, durations of only a few cycles, and infrequent strongly peaked variances and covariances. Winds exhibited rotary structures that varied strongly among sites and between events, and maximum amplitudes up to ∼ 20 m s −1 . Mean horizontal velocity covariances tended to be largely negative at all sites throughout the interval studied.

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The 4‐day wave in the Antarctic mesosphere

Cited by 24 publications

References 21 publications

Short-period planetary waves in the Antarctic middle atmosphere

Short-period planetary waves in the Antarctic middle atmosphere

Transient eastward-propagating long-period waves observed over the South Pole

Interhemispheric structure and variability of the 5-day planetary wave from meteor radar wind measurements

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