205 火星気候システムに及ぼす自転軸傾斜の影響(セッション2)

概要

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Many valley networks on the surface of Mars suggest existence of warm and wet climate in the distant past. We construct a one-dimensional energy balance climate model with CO_2-dependent outgoing radiation, changes of areal extent of CO_2 ice caps, and adsorption of CO_2 by regolith, under the condition of seasonal changes of solar radiation income. We have investigated behaviors of the Martian climate system and, in particular, examined the effect of obliquity variation of Mars. We found that a drastic change of the Martian climate (called a "climate jump") due to decrease in the total amount of CO_2 might have occurred during the long-term evolution of the Martian climate. We also found that the climate jump could have occurred repeatedly in short-term cycles during the Martian history due to changes in the obliquity of Mars.
日本惑星科学会の論文
2001-10-06