| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2015: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
|
|---|
| Outline of Final Research Achievements |
In this study, in order to clarify the stratosphere-mesosphere-lower thermosphere dynamical coupling processes during sudden stratospheric warming (SSW) events, we make dynamical analyses of the general circulation up to the mesopause level on the basis of Aura Microwave Limb Sounder data. It is found that large-scale waves are strengthened in the mesosphere due to changing background wind structure prior to the SSW occurrence and the waves could significantly contribute to general circulation changes in the mesosphere as well as in the lower thermosphere. In addition, during SSW events, residual mean poleward flows are enhanced to lead to equatorial temperature perturbations consisting of a cooling in the stratosphere and a warming in the mesosphere. These temperature perturbations are found to modulate the equatorial semiannual oscillation with two separate out-of-phase maxima centered near the stratopause and the upper mesosphere through the thermal wind balance at the equator.
|
