| Project/Area Number |
15253004
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Nagoya University |
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Principal Investigator |
MIZUNO Akira Nagoya University, Solar Terrestrial Environment Laboratory, Professor, 太陽地球環境研究所, 教授 (80212231)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAHAMA Tomoo Nagoya University, Solar Terrestrial Environment Laboratory, Associate professor, 太陽地球環境研究所, 助教授 (70377779)
MAEZAWA Hiroyuki Nagoya University, Solar Terrestrial Environment Laboratory, Assistant Professor, 太陽地球環境研究所, 助手 (00377780)
ONISHI Toshikazu Nagoya University, Graduate School of Science, Associate professor, 大学院・理学研究科, 助教授 (30314058)
OGAWA Hideo Osaka Prefecture University, Department of Physical Science, Professor, 総合科学部, 教授 (20022717)
NAKANE Hideaki National Institute for Environmental Studies, Atmospheric Environment Division, Deputy Director, 大気圏環境研究領域, 上席研究官 (50155777)
福井 康雄 名古屋大学, 大学院・理学研究科, 教授 (30135298)
米倉 覚則 大阪府立大学, 総合科学部, 助手 (90305665)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥39,780,000 (Direct Cost: ¥30,600,000、Indirect Cost: ¥9,180,000)
Fiscal Year 2004: ¥15,080,000 (Direct Cost: ¥11,600,000、Indirect Cost: ¥3,480,000)
Fiscal Year 2003: ¥24,700,000 (Direct Cost: ¥19,000,000、Indirect Cost: ¥5,700,000)
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| Keywords | Middle atmosphere / Atmospheric minor constituent / Remote sensing / Microwave radiometer / Superconductive receiver / Ground-based observation |
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| Research Abstract |
The aim of this project is to observe temporal and spatial variation of water vapor isotopic ratio in the middle atmosphere in order to understand the formation and transportation mechanism of water vapor. We developed a new radiometer system to obtain mm-wave H_2O (183GHz) and H_2^<18>O (203GHz) spectra simultaneously. The new system was installed at Atacama highland at an altitude of 4800m, since the 183GHz H_2O spectrum is hardly observable in low altitude places. The results through a two-year period of the project are summarized bellow
(1)Development of the dual-frequency mm-wave radiometer We designed new radiometer system equipped with two superconductive receivers to observe different water vapor isotopomers simultaneously. The two receivers are set in a common 4-Kelvin cryostat, while the optical paths for the two receivers are completely separated. In the laboratory, we confirmed that the new system was functioning well.
(2)H_2^<18>O observation at Las Campanas precedent to Atacama : From September 2003 to February 2004,we carried out continuous observations of H_2^<18>O at Las Campanas Observatory (alt.2,500m) in Chile. Since the spectral intensity of H_2^<18>O is very weak, Ta〜50mK, no such continuous ground-based observation has been ever done. We found that the seasonal variation of H_2^<18>O mixing ratio is similar to that of normal H_2O.
(3)183GHz H_2O observation in Atacama : The new radiometer system was installed in Atacama in September 2004,yet the instrumental setup was delayed because of bad working condition and unexpected hardware troubles due to low pressure environment at the site. We did not perform the dual-frequency operation during the project period, whereas we succeeded in detecting 183GHz H_2O spectrum in the single-frequency observation mode. We exhibited the feasibility of water vapor isotopic ratio measurements in Atacama and established the foundations for future observation through this project.
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