2022 Fiscal Year Final Research Report
Efficient transport processes toward the Martian upper atmoshere associated with the variety of dust storms
| Project/Area Number |
20K04044
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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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| Review Section |
Basic Section 17010:Space and planetary sciences-related
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| Research Institution | Kyoto Sangyo University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 火星 / ダストストーム / 物質輸送 |
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| Outline of Final Research Achievements |
Focusing on the western Arcadia Planitia in the northern hemisphere of Mars, local dust storms were automatically detected using deep learning from Mars images taken by the Mars Orbiter Camera onboard the Mars Global Surveyor for approximately three Mars years, and the latitude, longitude, season, and area of local dust storms were recorded. The results show that dust storms are more likely to occur in the seasons between the solstices and equinoxes. Comparison with the Mars Reanalysis dataset reveals that dust storms are more frequent when the amplitude of atmospheric waves with a period of 2 sols near the surface is significant. These atmospheric waves are considered to be baroclinic waves based on their period and wavenumber.
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| Free Research Field |
惑星気象学
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| Academic Significance and Societal Importance of the Research Achievements |
世界で初めて深層学習を用いて火星ダストストームを自動検出し，緯度経度，季節，面積を自動記録することで，当該地域におけるダストストームの統計的特徴を明らかにした．目視検出した過去の研究と整合的な結果が得られ，他の地域への応用が期待できる．ダストストームの発生と相関がある波動を特定できたので，ダストストームのメカニズムの解明へとつながる．さらに，火星北半球中緯度のダストストームは，実は地球の中緯度でよくみられる一般的に知られた大気現象で説明できる可能性がある．大気現象の点で，地球と火星はよく似ていることの証左として，一般に発表できるかもしれない．
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