| Project/Area Number |
21540449
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Hirosaki University |
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Principal Investigator |
KODAMA Yasumasa 弘前大学, 大学院・理工学研究科, 准教授 (30205421)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Naoki 東京学芸大学, 自然科学系, 講師 (90392935)
二宮 洸三 独立行政法人海洋研究開発機構, 地球環境変動領域, 特任上席研究員 (60292950)
川村 隆一 富山大学, 大学院・理工学研究科, 教授 (30303209)
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| Co-Investigator(Renkei-kenkyūsha) |
NINOMIYA Kozo 独立行政法人海洋研究開発機構, 地球環境変動領域, 特任上席研究員 (60292950)
KAWAMURA Ryuichi 富山大学, 大学院・理工学研究科, 教授 (30303209)
YOSHIKANE Takao 独立行政法人海洋研究開発機構, 地球環境変動領域, 主任研究員 (40392964)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 亜熱帯収束帯 / SACZ / SPCZ / 梅雨前線帯 / 亜熱帯ジェット気流 / 大気海洋相互作用 / ハドレー循環 / モンスーン / 子午面循環 |
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| Research Abstract |
There are three subtropical convergence zones (STCZ) in the global atmosphere. The Baiu frontal zone is one of them. We studied mechanisms how each STCZ is maintained. We examined the roles of the Brazilian Plateau in maintaining the SACZ (South Atlantic convergence zone) by data analysis of long-term observation and numerical experiments. On the roles of subtropical jets, we found that the hypotheses proposed by Sampe and Xie (2010), in which warm advection by jet in the middle troposphere may intensify the rainfall along the Baiu frontal zone, can be applied for the SACZ and the SPCZ (South Pacific convergence zone). The Baiu frontal zone has direction and latitudes differ from those of the other STCZs in the Southern Hemisphere. Dynamic influence of Kuroshio current on these unique features of the Baiu frontal zone was discussed using observational data of the ocean.
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