Gravity-wave-induced variations in exothermic heating in the low-latitude, equinox mesophere and lower thermosphere region

Details Gravity-wave-induced variations in exothermic heating in the low-latitude, equinox mesophere and lower thermosphere region Gravity-wave-induced variations in exothermic heating in the low-latitude, equinox mesophere and lower thermosphere region

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgra..11702307h&link_type=abstract

Journal of Geophysical Research, Volume 117, Issue A2, CiteID A02307

Other

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Atmospheric Composition And Structure: Middle Atmosphere: Energy Deposition (3334)

Scientific paper

We investigate gravity-wave-induced variations in exothermic heating in the OH nightglow region at a latitude of 18° in the Northern and Southern Hemispheres during March. An OH nightglow chemistry model with gravity wavefields from a spectral full-wave model is used for the investigation. Our simulation results show that the wave packet induces a large secular increase in the number densities of the minor species involved in the OH chemistry, a 50% increase in O3, 42% in O, and 29% in OH (v = 8), and the ultimate driver for these increases is the wave-driven downward transport of O. We find that the total exothermic heating rates have increased by ˜44.2% for 18°S and ˜30.9% for 18°N by the end of the simulation time. Also, the peak values of the mean wave-induced total exothermic heating rates are significant, ˜2.0 K d-1 at the peak altitude of 88 km and ˜2.2 K d-1 at 89 km for 18°S and 18°N, respectively. The major reactions contributing to exothermic heating rates are the three-body recombination O + O + M and the H + O3 reaction. The hemispheric asymmetry in the heating rates is mainly due to the different atmospheric conditions at 18°N and 18°S since the same wavefields are used in the numerical simulations.

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