Four climate regimes on a land planet with wet surface: Effects of obliquity change and implications for ancient Mars |
| |
Authors: | Yutaka Abe Atsushi Numaguti Goro Komatsu |
| |
Institution: | a Department of Earth and Planetary Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan b Graduate School of Earth Environment Research, Hokkaido University, Sapporo 060, Japan c International Research School of Planetary Sciences, Universita' d'Annunzio, Viale Pindaro 42, 65127 Pescara, Italy |
| |
Abstract: | Series of numerical experiments are performed using a general circulation model to gain insights on the hydrologic cycle on ancient Mars. Since the state of the ancient Mars atmosphere is not well constrained, we did not try to simulate an ancient Mars climate under warm and wet condition. In stead, we used an idealized model and tried to extract general features of the hydrologic cycle by modeling an ideal land planet that has no ocean on its surface. Four different climate regimes, “warm-upright,” “warm-oblique,” “frozen-upright,” and “frozen-oblique” regimes, are recognized depending on the inclination of the spin axis (obliquity) and average surface temperature. The period of active hydrologic cycle suggested from the geomorphology on Mars seems to be consistent with that at the “warm-oblique” regime, which appears at warm (above-freezing) environment with high-obliquity (higher than about 30°) condition. |
| |
Keywords: | Mars Climate Atmospheres Dynamics |
本文献已被 ScienceDirect 等数据库收录! |
|