| Project/Area Number |
23540515
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Kyushu University |
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Principal Investigator |
ITOH Hisanori 九州大学, 理学(系)研究科(研究院), 名誉教授 (80112100)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | ブロッキング / テレコネクション / 渦位 / 移動性高気圧 / 低周波変動 / 準定常 / 渦と渦の相互作用 / 選択的吸収 / ジェット気流 / blocking / selective absorption / vortex interaction / barotropic model / synoptic anticyclone / jet stream |
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| Research Abstract |
Blocking is a large-sclae anticyclone sometimes formed in mid- and high-latitudes, persisting for a long time. It is closely related to many anomalous phenomena such as hot summer in 2010 and cold winter and heavy snow in 2011-2012. It is therefore important to clarify how it persists so long. However, its maintenance mechanism has not been clarified in spite of many studies.
To this tough problem, we proposed a new idea that blocking anticyclones can selectively absorb synoptic anticyclones. Synoptic anticyclones are ubiquitous and are transported near blocking anticyclones by the jet stream. Thus, blocking anticyclones are always refleshed by this absorption, and can persist for a long time. This idea was proved by data analyses of real blocking and numerical simulations for various possible settings.
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