Mechanisms leading to a warmer climate on high obliquity planets. (arXiv:1903.03726v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Kang_W/0/1/0/all/0/1">Wanying Kang</a>

High obliquity planets have been suggested to be warmer than their low
obliquity equivalents when the climate is cold, and the ice-albedo feedback has
been suggested to play a dominant role. In this study, we first find the
warming under high obliquity to be a universal behavior that does not rely on
the existence of ice, and then try to understand the mechanisms through a
series of feedback suppression experiments. Ice-albedo feedback contributes
significantly to the warm climate under high obliquity, consistent with
previous studies. However, turning off the ice-albedo feedback, the temperature
contrast is still significant, suggesting the warmness of high obliquity
planets is a universal behavior regardless of the existence of ice. This
warming is caused by the low planetary albedo under high obliquity, which is
due to the surface temperature (and thus cloud formation) lagging behind the
substellar point movement.

High obliquity planets have been suggested to be warmer than their low
obliquity equivalents when the climate is cold, and the ice-albedo feedback has
been suggested to play a dominant role. In this study, we first find the
warming under high obliquity to be a universal behavior that does not rely on
the existence of ice, and then try to understand the mechanisms through a
series of feedback suppression experiments. Ice-albedo feedback contributes
significantly to the warm climate under high obliquity, consistent with
previous studies. However, turning off the ice-albedo feedback, the temperature
contrast is still significant, suggesting the warmness of high obliquity
planets is a universal behavior regardless of the existence of ice. This
warming is caused by the low planetary albedo under high obliquity, which is
due to the surface temperature (and thus cloud formation) lagging behind the
substellar point movement.

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