| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2017: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2016: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2015: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2014: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
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| Outline of Final Research Achievements |
We investigate the maintenance mechanism of the annular mode, which is the most prevailing variation mode in the extratropical troposphere, using a reanalysis dataset. It is found that the quasi-stationary planetary waves and transient synoptic waves play the most important role in driving the annular mode in the northern hemisphere and southern hemisphere, respectively. It is also revealed that the vertical propagation property of planetary waves in the recovery phase of stratospheric sudden warming events is intimately related to the subsequent formation of annular mode. Moreover, several aspects of the predictability variation of the stratospheric circulation, which are closely related with the tropospheric annular mode, are clarified through the analyses on ensemble reforecast experiments conducted by the MRI (Meteorological Research Institute) ensemble prediction system which is constructed in this study.
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