Physics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.324..347w&link_type=abstract
Nature (ISSN 0028-0836), vol. 324, Nov. 27, 1986, p. 347-349. Research supported by the Aerospace Sponsored Research Program.
Physics
45
Atmospheric Tides, Diurnal Variations, Mesopause, Polar Meteorology, Temperature Distribution, Airglow, Atmospheric Models, Gravity Waves, Winter
Scientific paper
Current atmospheric tidal models predict an amplitude of less than about 2 K for the solar semidiurnal temperature variations in the polar mesopause during the winter solstice period. In contrast, an amplitude of about 13 K for the 12-h variations in the mesopause temperature at Longyearbyen, Spitsbergen on UT day 359 in 1984 is reported here. The kinetic temperature of the mesopause was deduced from the thermalized rotational distribution of the mesopause airglow OH(8,3) vibrational-rotational band emission in the near-infrared spectral region. A semidiurnal 'pseudotide' is proposed as the source of the observed large-amplitude 12-h temperature variation. This pseudotide is generated by gravity-wave momentum fluxes modulated by the true semidiurnal tide. The semidiurnal pseudotide is very efficiently excited at very high latitudes. Based on conservative values of gravity-wave amplitudes, a temperature amplitude of about 10 K is estimated.
Hamwey Robert M.
Schubert Gerald
Sivjee G. G.
Walterscheid Richard L.
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