I'm trying to figure out what sort of mechanism might...

[töff]

Water takes lots of energy to heat (in chemistry terms) so more water = more energy to maintain temperature = planet cools.
Enough water (e.g. comets landing to cause 800m sea level rise) would eventually accumulate into an ice age

I dunno about that. Sure, keep dumping ice on a planet, it'll cool ... but solar energy plus core-produced radioactive heat, I would think, would soon bring back equilibrium.

Plus, the energy of the ice meteors themselves, as they brake into the planet, would ADD to the total energy of the system.

This is not an effect I would worry about unless I thought it was a fun thing to include.

[Juggernaut1981]

I dunno about that. Sure, keep dumping ice on a planet, it'll cool ... but solar energy plus core-produced radioactive heat, I would think, would soon bring back equilibrium.

Plus, the energy of the ice meteors themselves, as they brake into the planet, would ADD to the total energy of the system.

This is not an effect I would worry about unless I thought it was a fun thing to include.

I'm just thinking of the specific heat capacity of water, compared to most other things, and its stupidly large. Water's specific heat is about 4kJ/kg... Iron is 0.4kJK/kg

It just takes a lot more energy to warm up water. So depending on how much you dump in there, how fast, etc, etc, etc you could cause a nice dip in the temperature. I doubt the energy of the asteroids would compensate for the heat capacity of the water.

[töff]

specific heat capacity of water, compared to most other things, and its stupidly large. Water's specific heat is about 4kJ/kg...takes a lot more energy to warm up water. So depending on how much you dump in there, how fast, etc, etc, etc you could cause a nice dip in the temperature. I doubt the energy of the asteroids would compensate for the heat capacity of the water.

If the ice meteors are "burning up on reentry" to steam in the upper atmosphere, there ain't no reason to worry about this at all.

I smell a stratometeorological thesis here: the caloric limit of net energy gain per the mass of an ice asteroid.