Tidal oscillations of the Arctic upper mesosphere and lower thermosphere in winter

Oznovich, I.; McEwen, D. J.; Sivjee, G. G.; Walterscheid, R. L.

doi:10.1029/96ja03560

Cited by 36 publications

(34 citation statements)

References 29 publications

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“…However, the tide amplitudes with periods equal to or less than 6 h are relatively small in some observations and not always found in analysis of time series (e.g. Oznovich et al, 1997;Kovalam and Vincent, 2003;Smith et al, 2004). Therefore, we suppose that the major periods of tides are 24 h, 12 h and 8 h, while the 6-h tide is not considered here.…”

Section: Discussionmentioning

confidence: 99%

Variability of MLT winds and waves over mid-latitude during the 2000/2001 and 2009/2010 winter stratospheric sudden warming

Chen

Cunying

2012

Ann. Geophys.

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winter are examined to reveal the effects of stratospheric sudden warming (SSW) in mid-low-latitude MLT region. The result shows that the MLT daily zonal wind over these two sites reversed from eastward wind to westward wind for several days during the SSW events. The reversals were almost coincident with the polar stratospheric temperature reaching its maximum at 10 hPa, 90 • N and were about ten days prior to the reversal of high latitude stratospheric zonal wind at 10 hPa, 60 • N. The temporal variations of tides, gravity waves and 2-day planetary waves in the mid-latitude MLT showed different behavior during the two SSW events. During the 2001 SSW event, MLT diurnal tide reached its maximum when the MLT zonal wind decreased rapidly and SSW event began in polar stratosphere; the activity of 2-day waves decreased after the onset of the 2001 SSW, while the gravity wave increased when the 2001 SSW developed into a major warming. However, in the 2009/2010 winter, the semidiurnal tide and 2-day wave in MLT over Langfang reached a peak about two days earlier than zonal wind reversal at 10 hPa, 60 • N; no significant features were found in diurnal tides, terdiurnal tides and gravity waves related to the 2010 SSW event.

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Section: Discussionmentioning

confidence: 99%

Variability of MLT winds and waves over mid-latitude during the 2000/2001 and 2009/2010 winter stratospheric sudden warming

Chen

Cunying

2012

Ann. Geophys.

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“…localized, frequently sampled in time) observations are necessary for detailed investigation of the dynamics of signal progression between the MLT and lower atmospheric regions. Such time series analysis of wind velocities and temperatures in Arctic MLT have been recorded, amongst others, by Sivjee et al (2003), Ozonovich et al (1997) at Eureka, Mitchell et al (2002) from Esrange meteor radar, Won et al (1999) from Thule Air Base, Fisher et al (2002), Bhattacharya et al (2004) and Wu et al (2005) at Resolute Bay. Walterscheid et al (2000) have studied temperature changes using rotational temperatures from the OH airglow and NCEP (National Center for Environmental Prediction) assimilated data in the MLT over Eureka (80 • N) over a period of ∼35 days during a 1993 stratospheric warming event, and compared it to the predictions of the TIME-GCM model.…”

Section: Introductionmentioning

confidence: 99%

Correlations of mesospheric winds with subtle motion of the Arctic polar vortex

Bhattacharya

Gerrard

2010

Atmos. Chem. Phys.

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Abstract. This paper investigates the relationship between high latitude upper mesospheric winds and the state of the stratospheric polar vortex in the absence of major sudden stratospheric warmings. A ground based Michelson Interferometer stationed at Resolute Bay (74 • 43 N, 94 • 58 W) in the Canadian High Arctic is used to measure mesopause region neutral winds using the hydroxyl (OH) Meinel-band airglow emission (central altitude of ∼85 km). These observed winds are compared to analysis winds in the upper stratosphere during November and December of 1995 and 1996; years characterized as cold, stable polar vortex periods. Correlation of mesopause wind speeds with those from the upper stratosphere is found to be significant for the 1996 season when the polar vortex is subtly displaced off its initial location by a strong Aleutian High. These mesopause winds are observed to lead stratospheric winds by approximately two days with increasing (decreasing) mesospheric winds predictive of decreasing (increasing) stratospheric winds. No statistically significant correlations are found for the 1995 season when there is no such displacement of the polar vortex.

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“…Most of them are restricted to the short-period (6 and 8 hours) tidal oscillations in the high-latitude mesopause region [Sivjee and Walterscheid, 1994;Oznovich et al, 1997;Walterscheid and Sivjee, 2001], or to the zonally symmetric 12-and 24-h tides observed at 95 km height in the wind measurements from the HRDI and WINDII on UARS [Forbes et al, 2003;Huang and Reber, 2004]. Sivjee and Walterscheid [2002], however, analysing the airglow brightness low-frequency variability measured at Eureka, Canada (80°N) and South Pole station found fairly broadband spectral features of the mesopause region centred approximately at 17, 23 and 45 days.…”

Section: Introductionmentioning

confidence: 99%

Zonally symmetric oscillations in the Northern Hemisphere stratosphere during the winter of 2003–2004

Pancheva

Mukhtarov

Andonov

2007

Geophysical Research Letters

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[1] The paper presents clear evidence of zonally symmetric planetary waves with very large amplitudes present in the UK Met Office zonal wind data of the Northern Hemisphere stratosphere in the winter of 2003 -2004. The spectral analysis reveals that three prevailing periods of $23, 17 and 11 days contribute to the observed zonally symmetric oscillations. These waves are extracted from the data and their amplitudes and phases are studied in detail depending on height and latitude. The wave amplitudes -particularly those of the 11-and the 17-day zonally symmetric wavesclearly indicate the presence of two latitudinal branches of amplifications centred at 50-60°N and 20-30°N. The phase analysis shows that these waves are vertically upward propagating waves and that the waves from the high-latitude and tropical branches are almost out of phase. A possible forcing mechanism is suggested. The zonally symmetric waves play an important role in coupling the dynamical regimes of the high-and low-latitude stratosphere particularly during the major stratwarm event in the

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Tidal oscillations of the Arctic upper mesosphere and lower thermosphere in winter

Cited by 36 publications

References 29 publications

Variability of MLT winds and waves over mid-latitude during the 2000/2001 and 2009/2010 winter stratospheric sudden warming

Variability of MLT winds and waves over mid-latitude during the 2000/2001 and 2009/2010 winter stratospheric sudden warming

Correlations of mesospheric winds with subtle motion of the Arctic polar vortex

Zonally symmetric oscillations in the Northern Hemisphere stratosphere during the winter of 2003–2004

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