2013 Fiscal Year Research-status Report
成層圏から超高層まで：成層圏突然昇温に対する熱圏降温現象の生成機構の解明
| Project/Area Number |
25800274
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Research Institution | Kyushu University |
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Principal Investigator |
フイシン リュウ 九州大学, 国際宇宙天気科学・教育センター, 准教授 (70589639)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Keywords | Stratosphere warming / thermosphere response / semi-diurnal tides / cooling |
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| Research Abstract |
The upper atmosphere response to stratosphere sudden warming was studied using the GAIA model. Model simulation reveals strong local time and height dependence of the thermosphere temperature and density. The following features are found: (1) The effect is primarily quasi-semidiurnal in tropical regions, with warming in the noon and pre-midnight sectors and cooling in the dawn and dusk sectors. (2) This pattern exists at all altitudes above 100km, with its phase being almost constant above 200km, but propagates downward in the lower thermosphere between 100 and 200 km. (3) The northern polar region experiences warming in a narrow layer between 100 and 130km, while the southern polar region experiences cooling throughout 100–400 km altitudes. (4) The global net thermal effect on the atmosphere above 100km is a cooling of approximately 12 K. These characteristics provide us with an urgently needed global context to better connect and understand the increasing upper atmosphere observations during SSW events.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The model simulation was carried out rather smoothly without much problem. This enabled us to quickly proceed with the investigation of the underlying mechanisms. Furthermore, with the models' various output parameters, we could carry out a more intensive analysis on the interaction between the upper and lower atmosphere during stratosphere sudden warming.
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| Strategy for Future Research Activity |
1. Further investigation of the upper atmosphere dynamical change caused by tidal variations using the model.
2. Investigate the lunar tides signature in the long-term champ density observation and also the GAIA long-term simulation results.
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| Expenditure Plans for the Next FY Research Funding |
ほかの２５年度限定の補助金があったので、本補助金を２６年度にまわした。
１学会発表ための旅費 ２研究打ち合わせための旅費 ３論文発表ための費用 ４共同研究者の招聘
５パソコンのソフト更新費用
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