Climatology of the quasi two-day wave over Saskatoon (52°N, 107°W): 14 Years of MF radar observations

Chshyolkova, T.; Manson, A. H.; Meek, C. E.

doi:10.1016/j.asr.2005.03.040

Cited by 23 publications

(24 citation statements)

References 13 publications

(11 reference statements)

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“…This result is consistent with the westward phase velocity being then consistently lower than the background wind and hence the occurrence of critical levels. More generally, the monthly occurrences of the Q2DW at m=+3, which include winter as well as summer months, are very consistent with the radar-wind studies of this wave (Meek et al, 1996;Chshyolkova et al, 2005). We also note that although the non-linear interaction between the Q2DW and the diurnal tide has been documented for particular events (Manson et al, 1998;Pancheva, 2006), instances of the production of 16 h oscillations are not numerous enough to lead to a spectral peak in Fig.…”

Section: Summer Frequency "Dish"supporting

confidence: 64%

“…This is particularly clear for the PW of period near 2 days and m=+3, which is the winter manifestation of the Rossby-gravity wave Q2DW. As discussed elsewhere Chshyolkova et al, 2005) these waves had not been considered until recently, due to the radar-types used and emphasis upon the Summer Polar Mesospheric Echoes (PMSE) in the Scandinavian sector.…”

Section: Pw Wave Number Spectra and The "Best Mode"mentioning

confidence: 99%

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Summer planetary-scale oscillations: aura MLS temperature compared with ground-based radar wind

Meek

Manson

2009

Ann. Geophys.

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Abstract. The advent of satellite based sampling brings with it the opportunity to examine virtually any part of the globe. Aura MLS mesospheric temperature data are analysed in a wavelet format for easy identification of possible planetary waves (PW) and aliases masquerading as PW. A calendar year, 2005, of eastward, stationary, and westward waves at a selected latitude is shown in separate panels for wave number range −3 to +3 for period range 8 h to 30 days (d). Such a wavelet analysis is made possible by Aura's continuous sampling at all latitudes 82 • S-82 • N. The data presentation is suitable for examination of years of data. However this paper focuses on the striking feature of a "dish-shaped" upper limit to periods near 2 d in mid-summer, with longer periods appearing towards spring and fall, a feature also commonly seen in radar winds. The most probable cause is suggested to be filtering by the summer jet at 70-80 km, the latter being available from ground based medium frequency radar (MFR). Classically, the phase velocity of a wave must be greater than that of the jet in order to propagate through it. As an attempt to directly relate satellite and ground based sampling, a PW event of period 8d and wave number 2, which appears to be the original rather than an alias, is compared with ground based radar wind data. An appendix discusses characteristics of satellite data aliases with regard to their periods and amplitudes.

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Section: Summer Frequency "Dish"supporting

confidence: 64%

Section: Pw Wave Number Spectra and The "Best Mode"mentioning

confidence: 99%

Summer planetary-scale oscillations: aura MLS temperature compared with ground-based radar wind

Meek

Manson

2009

Ann. Geophys.

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“…Maximum 2-day wave activity has been reported during solstices and minima at the equinoxes at middle and at high latitudes (Nozawa et al, 2005;Chshyolkova et al, 2005;Murphy et al, 2007;Jacobi et al, 2008).…”

Section: -Daymentioning

confidence: 99%

Climatology of planetary wave type oscillations with periods of 2–20 days derived from O<sub>2</sub> atmospheric and OH(6-2) airglow observations at mid-latitude with SATI

et al. 2009

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Abstract. The presence of planetary wave type oscillations at mid-latitudes in the mesosphere/lower thermosphere region has been investigated using airglow observations. The observations were taken with a Spectral Airglow Temperature Imager (SATI) installed at Sierra Nevada Observatory (37.06 • N, 3.38 • W) at 2900 m height. Airglow data of the column emission rate of the O 2 Atmospheric (0-1) band and of the OH Meinel (6-2) band and deduced rotational temperatures from 1998 to 2007 have been used in this study. From these observations a climatology of planetary wave type oscillations at this location is inferred. It has been found that the planetary wave type oscillations of 5-day period is predominant in our data throughout the year, with activity greater than 50% during March/April and October/November months. The planetary wave type oscillations of 2-day period is predominant during both solstices, being predominant during winter solstice in O 2 while a 10-day oscillation appears throughout the year with activity around 20% and with maximum activity during spring and autumn equinoxes. The 16-day oscillation has maximum occurrence during autumn-winter while its activity is almost disappeared during spring-summer. No clear seasonal dependence of the amplitude of the planetary wave type oscillations was observed in the cases considered in this study.The waves simultaneously detected in the rotational temperatures deduced from both OH and O 2 emissions usually Correspondence to: M. J. López-González (mariajose@iaa.es) show an upward energy propagation and are affected by dissipation processes.

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“…At high latitudes the wave shows a different behavior compared to at mid-latitudes, e.g., with maxima during winter (Muller and Nelson, 1978;Nozawa et al, 2003). The QTDW has been frequently observed by ground-based (e.g., Muller, 1972;Babadshanov et al, 1973;Plumb et al, 1987;Harris, 1994;Jacobi et al, 1997;Gurubaran et al, 2001;Chshyolkova et al, 2005) and satellite instruments (Wu et al, 1996;Tunbridge et al, 2011). Additionally, several numerical studies simulated possible excitation processes (Salby, 1981a, b;Plumb, 1983;Palo et al, 1999;Salby and Callaghan, 2001).…”

Section: Introductionmentioning

confidence: 99%

Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

Lilienthal

Jacobi

2015

Atmos. Chem. Phys.

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Abstract. The quasi 2-day wave (QTDW) at 82-97 km altitude over Collm (51 • N, 13 • E) has been observed using a VHF meteor radar. The long-term mean amplitudes calculated using data between September 2004 and August 2014 show a strong summer maximum and a much weaker winter maximum. In summer, the meridional amplitude is slightly larger than the zonal one with about 15 m s −1 at 91 km height. Phase differences are slightly greater than 90 • on an average. The periods of the summer QTDW vary between 43 and 52 h during strong bursts, while in winter the periods tend to be more diffuse. On average, the summer QTDW is amplified after a maximum of zonal wind shear which is connected with the summer mesospheric jet and there is a possible correlation of the summer mean amplitudes with the background wind shear. QTDW amplitudes exhibit considerable inter-annual variability; however, a relationship between the 11-year solar cycle and the QTDW is not found.

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Climatology of the quasi two-day wave over Saskatoon (52°N, 107°W): 14 Years of MF radar observations

Cited by 23 publications

References 13 publications

Summer planetary-scale oscillations: aura MLS temperature compared with ground-based radar wind

Summer planetary-scale oscillations: aura MLS temperature compared with ground-based radar wind

Climatology of planetary wave type oscillations with periods of 2–20 days derived from O<sub>2</sub> atmospheric and OH(6-2) airglow observations at mid-latitude with SATI

Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

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Climatology of the quasi two-day wave over Saskatoon (52°N, 107°W): 14 Years of MF radar observations

Cited by 23 publications

References 13 publications

Summer planetary-scale oscillations: aura MLS temperature compared with ground-based radar wind

Summer planetary-scale oscillations: aura MLS temperature compared with ground-based radar wind

Climatology of planetary wave type oscillations with periods of 2–20 days derived from O&lt;sub&gt;2&lt;/sub&gt; atmospheric and OH(6-2) airglow observations at mid-latitude with SATI

Meteor radar quasi 2-day wave observations over 10 years at Collm (51.3° N, 13.0° E)

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Climatology of planetary wave type oscillations with periods of 2–20 days derived from O<sub>2</sub> atmospheric and OH(6-2) airglow observations at mid-latitude with SATI