Lunar semidiurnal tide in the terrestrial airglow

Savigny, Christian von; Lednyts'kyy, Olexandr; Forbes, Jeffrey M.; Zhang, X.

doi:10.1002/2015gl063567

Cited by 10 publications

(20 citation statements)

References 28 publications

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“…1995a, 1995b, 1997), Yee et al (1997), She and Lowe (1998), Reisin (2000, 2010), Bittner et al (2000Bittner et al ( , 2002, Yamada et al (2001), Liu and Shepherd (2006), Reisin and Scheer (2004), Espy et al (2007, Mulligan et al (2009), Xu et al (2010, and von Savigny et al (2012Savigny et al ( , 2015. In an earlier paper, Yee et al (1997) stated that the quantitative comparison between theoretical and experimental brightness is rather poor.…”

Section: G R Sonnemann Et Al: Hydroxyl Layer 751mentioning

confidence: 99%

“…In order to reduce the strong scatter, the data are still averaged over the season. Long-term monitoring of the OH * layer was carried out, among others, by Lowe (2002), Reisin and Scheer (2002), Espy and Stegman (2002), Bittner et al (2002), Beig et al (2003), Offermann et al (2003Offermann et al ( , 2006Offermann et al ( , 2010, Scheer et al (2005), Beig (2011), andvon Savigny (2015). However, most publications deal with temperature trends derived from long-term OH * measurements.…”

Section: Trendsmentioning

confidence: 99%

“…Figure 10b, d, and f display the result as (negative) deviation from 1 January (a phase of 10 days, for example, means 22 December). Von Lednyts'kyy (2013) andvon Savigny (2015) reported a clear semiannual variation in the mean emission altitude at low latitudes with amplitude of 0.5-1 km. A semiannual variation in the emission altitude is to be expected considering the annual height variations in the parameters that determine the OH * chemistry.…”

Section: Correlations and Intra-annual Variabilitymentioning

confidence: 99%

“…The solar cycles are clearly mirrored in the data, but the absolute trend is completely negligible (the total changes over the entire period vary from −17.6 to +3.4 cm −3 ) compared with the impact due to the dynamics and chemistry and also with regard to the variability within the 11-year solar cycle (the Lyman-α flux varies by a factor of nearly 2 within a solar cycle, but the trend in Lyman-α amounts only to a few percent over the whole period of 49 years). Von Savigny (2015) reported that no 11-year solar cycle signatures are present in the OH emission altitude time series. Clearly, the dynamical influence overwhelms all other impacts.…”

Section: Trendsmentioning

confidence: 99%

“…It is important to note that the trend is different for winter, equinoxes and summer. Von Savigny (2015) Table 5 of their paper. Figure 1 exhibits the trend of the mean nighttime concentration of OH * v=6 at the peak averaged over the seasons winter (December, January, and February), spring (March, April, and May), and summer (June, July, and August) for high (68.75 • N), middle (51.25 • N), and low (1.25 • N) northern latitudes.…”

Section: Trendsmentioning

confidence: 99%

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Hydroxyl layer: trend of number density and intra-annual variability

et al. 2015

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Abstract. The layer of vibrationally excited hydroxyl (OH * ) near the mesopause in Earth's atmosphere is widely used to derive the temperature at this height and to observe dynamical processes such as gravity waves. The concentration of OH * is controlled by the product of atomic hydrogen, with ozone creating a layer of enhanced concentration in the mesopause region. However, the basic influences on the OH * layer are atomic oxygen and temperature. The long-term monitoring of this layer provides information on a changing atmosphere. It is important to know which proportion of a trend results from anthropogenic impacts on the atmosphere and which proportion reflects natural variations. In a previous paper (Grygalashvyly et al., 2014), the trend of the height of the layer and the trend in temperature were investigated particularly in midlatitudes on the basis of our coupled dynamic and chemical transport model LIMA (Leibniz Institute Middle Atmosphere). In this paper we consider the trend for the number density between the years 1961 and 2009 and analyze the reason of the trends on a global scale. Further, we consider intra-annual variations. Temperature and wind have the strongest impacts on the trend. Surprisingly, the increase in greenhouse gases (GHGs) has no clear influence on the chemistry of OH * . The main reason for this lies in the fact that, in the production term of OH * , if atomic hydrogen increases due to increasing humidity of the middle atmosphere by methane oxidation, ozone decreases. The maximum of the OH * layer is found in the mesopause region and is very variable. The mesopause region is a very intricate domain marked by changeable dynamics and strong gradients of all chemically active minor constituents determining the OH * chemistry. The OH * concentration responds, in part, very sensitively to small changes in these parameters.The cause for this behavior is given by nonlinear reactions of the photochemical system being a nonlinear enforced chemical oscillator driven by the diurnal-periodic solar insolation. At the height of the OH * layer the system operates in the vicinity of chemical resonance. The solar cycle is mirrored in the data, but the long-term behavior due to the trend in the Lyman-α radiation is very small. The number density shows distinct hemispheric differences. The calculated OH * values show sometimes a step around a certain year. We introduce a method to find out the date of this step and discuss a possible reason for such behavior.

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Section: G R Sonnemann Et Al: Hydroxyl Layer 751mentioning

confidence: 99%

Section: Trendsmentioning

confidence: 99%

Section: Correlations and Intra-annual Variabilitymentioning

confidence: 99%

Section: Trendsmentioning

confidence: 99%

Section: Trendsmentioning

confidence: 99%

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Hydroxyl layer: trend of number density and intra-annual variability

et al. 2015

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Influence of Solar and Lunar Tides on the Mesopause Region as Observed in Polar Mesosphere Summer Echoes Characteristics

et al. 2017

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Long‐term observations of polar mesosphere summer echoes (PMSE) from 2002 to 2012 are investigated with the aim to statistically study the effects of solar thermal migrating and lunar gravitational tides on aerosol layers and their environment at altitudes 80–90 km. The solar and lunar tidal periodicities are clearly present in PMSE data. For the first time, both amplitudes and phases of solar and lunar tides are estimated using PMSE data from the ESRAD radar located at Esrange (Sweden). The diurnal, semidiurnal, and terdiurnal solar migrating tides show pronounced periodicities in the PMSE strength and wind velocity components. Lunar tides demonstrate clear oscillations in the PMSE strength and wind velocities as well. “canonical” lunar gravitational tides, corresponding to the lunar gravitational potential, produce rather large amplitudes and are comparable to the solar thermal tides, whereas “noncanonical” lunar oscillations have minor effects on PMSE layers, but are still statistically significant. The influence of diurnal/semidiurnal tides and monthly/semimonthly tidal components is studied separately. Our estimations of solar thermal and lunar tidal amplitudes are in good agreement with those of previous model and experimental studies. A new mechanism of quadratic demodulation of the solar semidiurnal and lunar semidiurnal tides is shown to be valid at the summer mesopause and can explain periodical PMSE oscillations due to the lunar synodic semimonthly tide with period of 14.77 days. Two harmonics with periods of 27.0 and 13.5 days supposedly representing the solar rotation cycle are also clearly present in PMSE data.

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