Middle atmosphere effects of the quasi-two-day wave determined from a General Circulation Model

Palo, S. E.; Roble, R. G.; Hagan, M. E.

doi:10.1186/bf03353221

Cited by 104 publications

(193 citation statements)

References 74 publications

(104 reference statements)

Supporting

Mentioning

167

Contrasting

Order By: Relevance

“…Numerical simulations using linear models (Hagan et al, 1993;Salby and Callaghan, 2001) and some global circulation models (Palo et al, 1999) suggest the QTDW with S=3 to be the Rossby-gravity mode. However, the waves with S=4-5 with slower phase speeds cannot as readily propagate from the lower to upper atmospheric levels and attain significant amplitudes at MLT heights.…”

Section: Introductionmentioning

confidence: 99%

High- and mid-latitude quasi-2-day waves observed simultaneouslyby four meteor radars during summer 2000

Merzlyakov

Pancheva²,

Mitchell³

et al. 2004

Ann. Geophys.

View full text Add to dashboard Cite

Abstract.Results from the analysis of MLT wind measurements at Dixon (73.5 • N, 80 • E), Esrange (68 • N, 21 • E), Castle Eaton (UK) (53 • N, 2 • W), and Obninsk (55 • N, 37 • E) during summer 2000 are presented in this paper. Using S-transform or wavelet analysis, quasi-two-day waves (QTDWs) are shown to appear simultaneously at high-and mid-latitudes and reveal themselves as several bursts of wave activity. At first this activity is preceded by a 51-53 h wave with S=3 observed mainly at mid-latitudes. After a short recess (or quiet time interval for about 10 days near day 205), we observe a regular sequence of three bursts, the strongest of them corresponding to a QTDW with a period of 47-48 h and S=4 at mid-altitudes.We hypothesize that these three bursts may be the result of constructive and destructive interference between several spectral components: a 47-48 h component with S=4; a 60-h component with S=3; and a 80-h component with S=2. The magnitudes of the lower (higher) zonal wave-number components increase (decrease) with increasing latitude. The S-transform or wavelet analysis indicates when these spectral components create the wave activity bursts and gives a range of zonal wave numbers for observed bursts from about 4 to about 2 for mid-and high-latitudes. The main spectral component at Dixon and Esrange latitudes is the 60-h oscillation with S=3. The zonal wave numbers and frequencies of the observed spectral components hint at the possible occurrence of the nonlinear interaction between the primary QTDWs and other planetary waves. Using a simple 3-D nonlinear numerical model, we attempt to simulate some of the observed features and to explain them as a consequence of the nonlinear interaction between the primary 47-48 h and the 9-10 day waves, and the resulting linear superposition of primary and secondary waves. In addition to the QTDW bursts, we also infer forcing of the 4-day wave with S=2 and the 6-7 day wave with S=1, possibly arising from nonlinear decoupling of the 60-h wave with S=3. The starting mechanism for this decoupling is the Rossby wave instability (e.g.Correspondence to: E. Merzlyakov (eugmer@typhoon.obninsk.org) Baines, 1976). This result is consistent with the day-to-day wind variability during the observed QTDW events. An interesting feature of the final stage of the observed QTDW activity in summer 2000 is the occurrence of strong 4-5 day waves with S=3.

show abstract

Section: Introductionmentioning

confidence: 99%

High- and mid-latitude quasi-2-day waves observed simultaneouslyby four meteor radars during summer 2000

Merzlyakov

Pancheva²,

Mitchell³

et al. 2004

Ann. Geophys.

View full text Add to dashboard Cite

show abstract

“…They definitely demonstrate global vertical and horizontal propagation of the secondary waves from the source region (e.g. Palo et al, 1999).…”

Section: Measurements and Data Analysismentioning

confidence: 99%

On the longitudinal structure of the transient day-to-day variation of the semidiurnal tide in the mid-latitude lower thermosphere − I. Winter season

et al. 2001

View full text Add to dashboard Cite

Abstract. The longitudinal structure of the day-to-day variations of semidiurnal tide amplitudes is analysed based on coordinated mesosphere/lower thermosphere wind measurements at several stations during three winter campaigns. Possible excitation sources of these variations are discussed. Special attention is given to a nonlinear interaction between the semidiurnal tide and the day-to-day mean wind variations. Data processing includes the S-transform analysis which takes into account transient behaviour of secondary waves. It is shown that strong tidal modulations appear during a stratospheric warming and may be caused by aperiodic mean wind variations during this event.

show abstract

“…The results of the equatorial sites of Christmas Island (2 • N) and Tirunelveli (8.7 • N), as reported by Palo and Avery (1996) and Gurubaran et al (2001), respectively, show a stronger quasi-2-day wave in winter than in summer. Pancheva et al (2004) found amplitude averages in the range ∼5-26 m/s but peak amplitudes of 40 m/s (Lima et al, 2004) and 90 m/s (Pancheva, 2006) have also been reported. The amplitude of the QTDW have been observed to be modulated at ∼8-20 days (Pancheva et al, 2004) and are also correlated to the solar cycle (Jacobi et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Pancheva et al (2004) found amplitude averages in the range ∼5-26 m/s but peak amplitudes of 40 m/s (Lima et al, 2004) and 90 m/s (Pancheva, 2006) have also been reported. The amplitude of the QTDW have been observed to be modulated at ∼8-20 days (Pancheva et al, 2004) and are also correlated to the solar cycle (Jacobi et al, 1997). At low-to mid-latitudes the meridional component is slightly stronger than its zonal counterpart, whereas at high latitudes the two components are comparable (Pancheva et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars

Malinga

Ruohoniemi

2007

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. Data from the Super Dual Radar Network (SuperDARN) radars for 2002 were used to study the behaviour of the quasi-two-day wave (QTDW) in the Northern Hemisphere auroral zone. The period of the QTDW is observed to vary in the range of ∼42-56 h, with the most dominant period being ∼48 h and secondary peaks at ∼42-and ∼52-h. The spectral power shows a seasonal variation with a peak power (max∼70) in summer. The power shows variations of several days and there is also evidence of changes in wave strength with longitude. The 42-h and the 48-h components tend to be strongly correlated in summer. The onset of enhanced wave activity tends to coincide with the westward acceleration of the zonal mean flow and occurs at a time of strong southward meridional flow. The most frequent instantaneous hourly period is in the 40 to 50 h period band, in line with the simultaneous dominance of the 42-h and the 48-h components. The wave numbers are less variable and are around −2 to −4 during times of strong wave activity. For a period of ∼48 h, the zonal wave number is about −3 to −4, using a negative value to indicate westward propagating waves. The 42-h and the 52-h components cover a wider band in the −4 to 1 range. The wide zonal wave number spectrum in our results may account for the observed longitudinal variation in the spectral power of the wave.

show abstract

Middle atmosphere effects of the quasi-two-day wave determined from a General Circulation Model

Cited by 104 publications

References 74 publications

High- and mid-latitude quasi-2-day waves observed simultaneouslyby four meteor radars during summer 2000

High- and mid-latitude quasi-2-day waves observed simultaneouslyby four meteor radars during summer 2000

On the longitudinal structure of the transient day-to-day variation of the semidiurnal tide in the mid-latitude lower thermosphere − I. Winter season

The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars

Contact Info

Product

Resources

About