Estimation of vertical profiles of CO2 mixing ratio in the Martian polar nights by using radio occultation technique
| Project/Area Number |
15K05289
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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 | Nara Women's University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
Takeshi Kuroda 情報通信研究機構, ソーシャルイノベーションユニット統合ビッグデータ研究センター, 主任研究員 (40613394)
Takeshi Imamura 東京大学, 大学院新領域創成科学研究科, 教授 (40311170)
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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 |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 火星大気 / 二酸化炭素過飽和 / 火星 / 極夜 / 電波掩蔽観測 / 二酸化炭素 / 過飽和 / 凝結 |
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| Outline of Final Research Achievements |
The present study proposed a method to obtain vertical profiles of CO2 mixing ratio, which is the main component of the Martian atmosphere, by using radio occultation technique. Normally radio occultation technique obtains temperature-pressure profiles of planetary atmospheres, assuming atmospheric compositions. Our method, however, estimates CO2 mixing ratio in the polar nights, where CO2 condensates, assuming that air temperature in observed regions is CO2 saturation temperature. By using this method, we successfully obtained vertical profiles of CO2 mixing ratio in the polar nights. We also showed that atmospheric waves including stationary waves and transient waves had an important role on the occurrence of CO2 saturation in the polar nights.
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Report
(4 results)
Research Products
(17 results)
