HR: 11:20h
AN: A52B-05    [Abstracts]
TI: Solar cycle, QBO effect to the stratosphere and troposphere
AU: * Yamashita, Y
EM: yousuke@ccsr.u-tokyo.ac.jp
AF: Center for Climate System Research, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, 277-8568, Japan
AU: Sakamoto, K
EM: sakamoto.kei@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: Akiyoshi, H
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: Zhou, L B
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: Nagashima, T
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: Takahashi, M
AF: Center for Climate System Research, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, 277-8568, Japan
AB: The energy flux of high energy UV radiation changes by large amounts (>5%) during the 11-year solar cycle (Kuroda and Kodera, 2002). Ozone concentration variation in the tropical lower stratosphere is effected by the 11- year solar cycle, which is also influenced by the Quasi-biennial Oscillation (QBO), volcanic eruptions. In contrast, the temperature in the polar region is modulated by the 11-year solar cycle and the QBO (Labitzke, 1987). Labitzke and van Loon (1988) shows horizontal structure of the temperature anomaly, which indicates north-south dipole structure between the north pole and mid latitude. This structure is similar to the Arctic Oscillation (AO) or the Northern Hemisphere annular mode (NAM). The Chemistry and Climate Model (CCM) runs are performed with the REF1 scenario of Chemistry -Climate Model Validation (CCMVal, Eyring et al., 2006). The model includes the effects of the 11-year solar variation, QBO, and volcanic eruptions. We also use National Centers for Environmental Prediction (NCEP) / National Center for Atmospheric Research (NCAR) reanalysis data library. The latitude-height section of the ozone mixing ratio associated with the solar cycle shows small value around equatorial 30 hPa. On the other hand, there is large around equatorial 50 hPa. Our analyses find that the large value around 10-5hPa is caused mostly by the ozone production of the oxygen photolysis, while the small and large values in 30 and 50hPa are caused by dynamical responses of the vertical ozone advection. We derive two indices of the AO/NAM over the northern mid and high latitude stratosphere and the troposphere, and correlation analysis of the indices is applied to the four groups which are classified according to the phase of the solar cycle and the QBO. In the early winter (ND), the zonal wind shows westerly anomaly centered at 60 ° N from the stratosphere to the troposphere for the westward phase of the QBO with the solar maximum. This structure is maintained by the transient wave forcing (<30 day) over the troposphere, while the forcing of residual meridional circulation maintains the westerly wind over the stratosphere.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1650 Solar variability (7537)
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3362 Stratosphere/troposphere interactions
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly