Relation between supersaturation of CO2 and atmospheric waves on Mars

• Project/Area Number: 19K03951
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 17010:Space and planetary sciences-related
• Research Institution: Nara Women's University
• Principal Investigator: Noguchi Katsuyuki 奈良女子大学, 自然科学系, 准教授 (20397839)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 火星 / CO2 / 大気波動 / 火星大気 / CO2凝結 / 極冠 / 大気重力波

Outline of Research at the Start

本研究は、米国の火星探査機で実施された電波掩蔽観測による10年間の気温・気圧データを利用し、CO2凝結温度を下回る低温域を統計的に検出すると同時に大気波動の系統的な解析も行う。どのような性質を持つ大気波動がCO2凝結を引き起こすかを明らかにすると共に、逆にCO2凝結が大気波動の活動に与える影響も調べることで両者の相互作用を解明する。CO2凝結に関わる大気波動としては、傾圧不安定波(大規模波動)や大気重力波(小規模波動)等が挙げられる。

Outline of Final Research Achievements

In this study, we utilized the long-term data set of vertical profiles of temperature and pressure obtained by the US Mars orbiter to reveal the relation between atmospheric waves and low-temperature regions below the CO2 condensation temperature.

Academic Significance and Societal Importance of the Research Achievements

火星大気の主成分凝結と大気波動の活動の関係を明らかにすることで、極冠形成や降雪分布の議論にも寄与することができる。

Research Products

• [Int'l Joint Research] NASA・JPL(米国)
• [Int'l Joint Research] NASA(米国)
• [Int'l Joint Research] NASA(米国)
• [Presentation] 火星極夜域における大気主成分(CO2)過飽和の観測 (2022)
  • Author(s): 野口克行、下村真生、A. Kleinboehl, D. Kass and S. Piqueux
  • Organizer: 日本気象学会2022年度秋季大会
• [Presentation] Rederivation of the MGS Radio Occultation Measurements in the Martian South Polar Winter Regions Using MRO-MCS Temperature Climatology (2022)
  • Author(s): Noguchi, K., M. Shimomura, A. Kleinboehl, D. Kass, and S. Piqueux
  • Organizer: Seventh International Workshop on the Mars Atmosphere: Modelling and Observations
  • Int'l Joint Research
• [Presentation] CO2 supersaturation in the southern polar night (2021)
  • Author(s): Mao Shimomura, Katsuyuki Noguchi, Armin Kleinboehl, David Kass and Sylvain Piqueux
  • Organizer: Mars Climate Sounder extended Science Team Meeting
  • Int'l Joint Research
• [Presentation] Rederivation of the MGS radio occultation measurements in the Martian south polar winter regions using MRO-MCS temperature climatology (2021)
  • Author(s): Katsuyuki Noguchi, Armin Kleinboehl, David Kass, Sylvain Piqueux
  • Organizer: 43rd COSPAR Scientific Assembly
  • Int'l Joint Research