An emission layer as a gravity wave detector

Belyaev, A.N.

doi:10.1016/j.jastp.2009.09.001

Cited by 9 publications

(2 citation statements)

References 37 publications

(37 reference statements)

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“…As the off‐nadir line of sight slant path is longer than the nadir vertical path, the amplitude of the off‐nadir wave is increased because this longer path contains additional photons. For the off‐nadir slant path, the horizontal structure of the waves must be considered in interpreting actual observations (Belyaev, ; Preusse et al, ), possibly limiting observations to longer horizontal wavelengths.…”

Section: Resultsmentioning

confidence: 99%

Modeled Gravity Wave‐Like Perturbations in the Brightness of Far Ultraviolet Emissions for the GOLD Mission

et al. 2018

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The NASA Global‐scale Observations of Limb and Disk (GOLD) mission will study the coupling of the thermosphere with the lower atmosphere through an examination of temperature and composition, allowing the study of atmospheric waves. A key mechanism of energy and momentum transport between atmospheric regions is gravity waves. GOLD is an imaging spectrograph that will measure Earth's airglow emissions (both nightglow and dayglow) in the far ultraviolet range from 132 to 162 nm, including the atomic oxygen doublet at 135.6 nm and molecular nitrogen Lyman‐Birge‐Hopfield bands. GOLD will be the first instrument to make such measurements from the perspective of a geostationary orbit, which creates unique challenges and opportunities for observing atmospheric waves. Here we model the ability of the GOLD imager to detect a gravity wave‐like perturbation from the emergent brightness variations using a combination of a general circulation model and a model of the thermospheric airglow in the far ultraviolet. A 10% perturbation in temperature (±59 K at 150 km) and constituent densities is introduced into the vertical columns of the atmosphere, which results in a ±1.5 Rayleigh perturbation to the brightness of both spectral features, with the same wave period as the introduced perturbation. For the expected total signal, particle background counts, and chosen spectral feature, signal‐to‐noise calculations indicate that integration for several minutes will allow gravity wave perturbations to be observed in brightness perturbations on a single pixel of an image.

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Section: Resultsmentioning

confidence: 99%

Modeled Gravity Wave‐Like Perturbations in the Brightness of Far Ultraviolet Emissions for the GOLD Mission

et al. 2018

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“…Previous research with respect to the interaction of GWs and the chemistry of the MLT has focused on the variation of airglow due to relaxation of excited hydroxyl OH* [ Walterscheid et al , 1987; Taylor et al , 1991, 1995a, 1995b, 1997, 1998; Makhlouf et al , 1995, 1998; Wang et al , 2001a, 2001b; Huang et al , 2003, Huang , 2006; Nielsen et al , 2006], on nightglow from O 2 [ Weinstock , 1978; Takahashi et al , 1992; Zhang et al , 1993a, 1993b; Leko et al , 2002; Belyaev , 2009], and other constituents involved in airglow processes.…”

Section: Introductionmentioning

confidence: 99%

Wave mixing effects on minor chemical constituents in the MLT region: Results from a global CTM driven by high-resolution dynamics

2011

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[1] The dynamical fields of a high-resolution mechanistic general circulation model (GCM) with resolved gravity waves (GWs) are used to drive a chemistry-transport model (CTM) of the mesosphere-lower thermosphere (MLT). Both models have been used in previous studies and are coupled in off-line mode in order to study the explicit effects of GWs on the transport and photochemistry of minor constituents of the MLT. This is done on the basis of a sensitivity experiment. In our control simulation the CTM is driven with the full dynamical fields from an annual cycle simulated with the GCM, where mid-frequency GWs down to horizontal wavelengths of 350 km are resolved and their wave-mean flow interaction is self-consistently induced by an advanced turbulence model. A perturbation simulation with the CTM is defined by eliminating all meso-scale variations with horizontal wavelengths shorter than 1000 km from the dynamical fields by means of spectral filtering before running the CTM. The response of the CTM to GWs perturbations reveals strong effects on the trace-gas concentrations. In particular, minor chemical constituents with large photochemical life-time are strongly affected by vertical wave mixing, while constituents with short life-time reflect the dependence of their reaction rates on meso-scale temperature perturbations and on the changed distributions of long-lived constituents. The mean model response is strongest around the mesopause. We present detailed discussions of the simulated gravity-wave mixing effects on the photochemistry and highlight the consequences for our understanding of the general circulation of the MLT.Citation: Grygalashvyly, M., E. Becker, and G. R. Sonnemann (2011), Wave mixing effects on minor chemical constituents in the MLT region: Results from a global CTM driven by high-resolution dynamics,

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Gravity Wave Mixing and Effective Diffusivity for Minor Chemical Constituents in the Mesosphere/Lower Thermosphere

Grygalashvyly¹,

Becker²,

Sonnemann³

2011

Dynamic Coupling Between Earth’s Atmospheric and Plasma Environments

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An emission layer as a gravity wave detector

Cited by 9 publications

References 37 publications

Modeled Gravity Wave‐Like Perturbations in the Brightness of Far Ultraviolet Emissions for the GOLD Mission

Modeled Gravity Wave‐Like Perturbations in the Brightness of Far Ultraviolet Emissions for the GOLD Mission

Wave mixing effects on minor chemical constituents in the MLT region: Results from a global CTM driven by high-resolution dynamics

Gravity Wave Mixing and Effective Diffusivity for Minor Chemical Constituents in the Mesosphere/Lower Thermosphere

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