Toward the understanding of the orbital effects on planetary climate

Abstract

Orbital elements such as semi-major axis, eccentricity and obliquity have a great influence on planetary climate through the change of the insolation. Extra-solar planets detected so far have various values of orbital elements, so it is very important to know the effects of them on the climate of planets if one wants to explore the possibility of life outside the earth. We had studied the relation between the orbital elements and the planetary climate using latitudinally one-dimensional energy balance model (EBM). This time, we will check the EBM results using atmospheric general circulation model as a more realistic one, and from the differences and detailed mechanisms, we will discuss what kind of influence orbital elements may have on the habitable environment.