| Project/Area Number |
15K05282
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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 | Miyagi University of Education |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
Ishidoya Shigeyuki 産業技術総合研究所, 研究グループ付 (70374907)
AOKI Shuji 東北大学, 大学院理学研究科, 教授 (00183129)
MORIMOTO Shinji 東北大学, 大学院理学研究科, 教授 (30270424)
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| Research Collaborator |
Honda Hideyuki 宇宙科学研究所, 科学衛星運用・データ利用ユニット, 嘱託
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 成層圏 / 大気年代 / 重力分離 |
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| Outline of Final Research Achievements |
The gravitational separation of major atmospheric components, in addition to the age of air, would provide additional useful information about the stratospheric circulation. Air samples were collected over Biak, Indonesia in February 2015 using four large plastic balloons. Air samples from seven different altitudes were analyzed for CO2 and SF6 mole fractions, δ15N of N2, δ18O of O2, and δ(Ar/N2), to examine vertically dependent age and gravitational separation of air in the Tropical Tropopause Layer (TTL) and the equatorial stratosphere. The average values of δ all show small but distinct upward decrease due to the gravitational separation effect. Simulations with a two-dimensional atmospheric transport model indicate that the gravitational separation effect decreases as tropical upwelling is enhanced. The results of this study strongly suggest that the gravitational separation, combined with the age of air, can be used to diagnose air transport processes in the stratosphere.
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