HR: 0800h
AN: A31A-0050    [Abstracts]
TI: Solar Influence on Troposphere Through the Polar and the Equatorial Stratosphere
AU: * Kodera, K
EM: kodera@mri-jma.go.jp
AF: Kunihiko Kodera, Meteorological Research Institute, Tsukuba, 305-0031 Japan
AB: A possible mechanism of the solar influence on climate through dynamical processes is discussed. Variation of the solar ultra violet (UV) heating rate resulting from changes in the solar irradiance and ozone concentration produces small anomalous zonal wind in the subtropical stratopause region. This initial solar effects in the stratopause region is amplified through interaction with planetary waves propagating from the winter troposphere. There are two possible mechanisms for the downward penetration of the solar effect. One is the that the zonal wind anomalies produced in the subtropical stratopause region shifts poleward and downward in the westerly jet in the winter hemisphere similar to the polar night jet oscillation. When zonal wind anomaly reaches in the lower stratosphere, it induces changes in meridional propagation of tropospheric waves. Tropospheric wave change creates a circulation change similar to the Arctic or Antarctic Oscillation. Another possibility is that the modification of the wave mean-flow interaction in the upper stratosphere induces also change in meridional or the Brewer Dobson (BD) circulation. The BD circulation further modulates the Hadley circulation in the equatorial troposphere. This process may be responsible for the solar influence on the summer monsoon and the El Nino/ Southern Oscillation (ENSO).
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3362 Stratosphere/troposphere interactions
DE: 3319 General circulation
DE: 1600 GLOBAL CHANGE (New category)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting