Climates and Hbitability of Planets with High Orbital Eccentricities
| Project/Area Number |
18540430
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ABE Yutaka The University of Tokyo, Department of Earth and Planetary scienceGraduate school of science,, Associate Professor (90192468)
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| Co-Investigator(Kenkyū-buntansha) |
ABE-OUCHI Ayako The University of Tokyo, Center for climate system research, Associate Professor (30272537)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,850,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥450,000)
Fiscal Year 2007: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2006: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | hydrologic circulation / atmospheric circulation / climate / planet |
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| Research Abstract |
1. Results obtained by a one dimensional energy balance model (EBM) (1) Climate regimes are determined through a complex interaction among the annual, maximum and minimum insolations. (2) Owing to the increase of the annual insolation with eccentricity, generally warm climates are resulted at large eccentricity. (3) Multiplicity of the climate states is suppressed at large eccentricity. (4) Temporary run away greenhouse state at the perihelion affects the annual climate and habitability. (5) Precession sometimes changes planetary climate regimes. (6) Annual changes of temperature are a strongly affected by the obliquity and precession.
2. Results obtained by a general circulation model (1) The climate regimes are consistent with those obtained by the EBM. But they are a little cooler than those found in EBM. (2) The response to the increase of eccentricity differs depending on the property of the ground surface. (3) Annual changes of precipitation distribution is understood as the upright/oblique regime change modified by the annual insolation change due to the eccentricity.
3. Implication on the habitability (1) At large heat capacity, the habitability is controlled by the annual insolation. (2) At small heat capacity, planets with moderate obliquity are habitable only at small eccentricity, because precession affects climate significantly.
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Report
(3 results)
Research Products
(14 results)
