On the latitudinal variations of the non-periodic response of minor species induced by a dissipative gravity-wave packet in the MLT region

Tai-yin Huang, Michael Hickey

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15 Citations (Scopus)

Abstract

A spectral full-wave model and a two dimensional (2-D), time dependent, fully nonlinear chemistry model were used to investigate the latitudinal variations of the wave effects on the minor species in the OH chemistry in the mesosphere/lower thermosphere region. A dissipative gravity-wave packet is launched at three different latitudes propagating upward through the OH nightglow emission layer in the northern hemisphere. In addition to causing the minor species densities to fluctuate, the wave packet also causes non-periodic secular variations of the minor species densities as a consequence of violation of the non-acceleration conditions due to wave transience and dissipation. The associated fluxes of minor species are downward, and consequently minor species densities typically decrease at higher altitudes and increase at lower altitudes. The downward flux and subsequent chemical recombination of atomic oxygen is particularly important and can itself cause large secular variations of other less abundant minor species. Our studies indicate that the wave-induced non-periodic, secular variations are largest at high latitudes, second largest at low latitudes, and smallest at mid-latitudes.

Original languageEnglish (US)
Pages (from-to)741-757
Number of pages17
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume69
Issue number6
DOIs
StatePublished - Apr 1 2007

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gravity waves
gravity wave
secular variations
wave packets
secular variation
chemistry
nightglow
causes
low altitude
mesosphere
thermosphere
Northern Hemisphere
high altitude
tropical regions
polar regions
dissipation
recombination
oxygen

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science

Cite this

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title = "On the latitudinal variations of the non-periodic response of minor species induced by a dissipative gravity-wave packet in the MLT region",
abstract = "A spectral full-wave model and a two dimensional (2-D), time dependent, fully nonlinear chemistry model were used to investigate the latitudinal variations of the wave effects on the minor species in the OH chemistry in the mesosphere/lower thermosphere region. A dissipative gravity-wave packet is launched at three different latitudes propagating upward through the OH nightglow emission layer in the northern hemisphere. In addition to causing the minor species densities to fluctuate, the wave packet also causes non-periodic secular variations of the minor species densities as a consequence of violation of the non-acceleration conditions due to wave transience and dissipation. The associated fluxes of minor species are downward, and consequently minor species densities typically decrease at higher altitudes and increase at lower altitudes. The downward flux and subsequent chemical recombination of atomic oxygen is particularly important and can itself cause large secular variations of other less abundant minor species. Our studies indicate that the wave-induced non-periodic, secular variations are largest at high latitudes, second largest at low latitudes, and smallest at mid-latitudes.",
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TY - JOUR

T1 - On the latitudinal variations of the non-periodic response of minor species induced by a dissipative gravity-wave packet in the MLT region

AU - Huang, Tai-yin

AU - Hickey, Michael

PY - 2007/4/1

Y1 - 2007/4/1

N2 - A spectral full-wave model and a two dimensional (2-D), time dependent, fully nonlinear chemistry model were used to investigate the latitudinal variations of the wave effects on the minor species in the OH chemistry in the mesosphere/lower thermosphere region. A dissipative gravity-wave packet is launched at three different latitudes propagating upward through the OH nightglow emission layer in the northern hemisphere. In addition to causing the minor species densities to fluctuate, the wave packet also causes non-periodic secular variations of the minor species densities as a consequence of violation of the non-acceleration conditions due to wave transience and dissipation. The associated fluxes of minor species are downward, and consequently minor species densities typically decrease at higher altitudes and increase at lower altitudes. The downward flux and subsequent chemical recombination of atomic oxygen is particularly important and can itself cause large secular variations of other less abundant minor species. Our studies indicate that the wave-induced non-periodic, secular variations are largest at high latitudes, second largest at low latitudes, and smallest at mid-latitudes.

AB - A spectral full-wave model and a two dimensional (2-D), time dependent, fully nonlinear chemistry model were used to investigate the latitudinal variations of the wave effects on the minor species in the OH chemistry in the mesosphere/lower thermosphere region. A dissipative gravity-wave packet is launched at three different latitudes propagating upward through the OH nightglow emission layer in the northern hemisphere. In addition to causing the minor species densities to fluctuate, the wave packet also causes non-periodic secular variations of the minor species densities as a consequence of violation of the non-acceleration conditions due to wave transience and dissipation. The associated fluxes of minor species are downward, and consequently minor species densities typically decrease at higher altitudes and increase at lower altitudes. The downward flux and subsequent chemical recombination of atomic oxygen is particularly important and can itself cause large secular variations of other less abundant minor species. Our studies indicate that the wave-induced non-periodic, secular variations are largest at high latitudes, second largest at low latitudes, and smallest at mid-latitudes.

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