HR: 0800h
AN: A31A-0046    [Abstracts]
TI: Plausible Solar Influences on Wave Activities in the Middle and Lower Atmosphere
AU: * Hirooka, T
EM: hirook@geo.kyushu-u.ac.jp
AF: Department of Earth and Planetary Sciences, Kyushu University, 6-10-1, Hakozaki, Fukuoka, 812-8581 Japan
AU: Kuroda, Y
EM: kuroda@mri-jma.go.jp
AF: Meteorological Research Institute, 1-1, Nagamine, Tsukuba, 305-0052 Japan
AB: Recent satellite observations show that solar ultraviolet (UV) flux changes by 6-8% near 200 nm between extremes in the 11-year solar cycle, although the total insolation change is negligibly small. Such UV flux changes would bring about ozone changes in the middle atmosphere, which might directly influence tidal wave activity there. On the other hand, the ozone changes are considered to bring about changes of temperature and wind fields in the middle atmosphere. Hence, meridional planetary wave propagation could be influenced according to the change of resultant refractive properties of the atmosphere. In addition, some investigators have suggested the existence of an 11-year component in the Hadley circulation in the troposphere, which might influence planetary wave activity through convective activity changes. However, little convincing evidence supporting the speculation has been obtained and whether some presented relations to the 11-year solar cycle are true or accidental has not been clarified. In this paper, we will discuss plausible solar influences on activities of waves in the middle and lower atmosphere in detail.
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0342 Middle atmosphere--energy deposition
DE: 0350 Pressure, density, and temperature
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting