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
N1 - Funding Information:
We gratefully thank Dr. Rolando Garcia for providing some of the initial minor species data. Part of the work done at Clemson University was supported by NSF Grants ATM-0086299, ATM-9816159, and ATM-0003156. The work at Penn State University has been supported by NSF Grant ATM-0406585. The work at Embry-Riddle Aeronautical University was supported by NASA Grant NNG04G196G and NSF Grant ATM-0408407.
PY - 2007/4
Y1 - 2007/4
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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U2 - 10.1016/j.jastp.2007.01.011
DO - 10.1016/j.jastp.2007.01.011
M3 - Article
AN - SCOPUS:33947624235
SN - 1364-6826
VL - 69
SP - 741
EP - 757
JO - Journal of Atmospheric and Solar-Terrestrial Physics
JF - Journal of Atmospheric and Solar-Terrestrial Physics
IS - 6
ER -