Originally Posted by wogoga
Originally Posted by ben m
Do you know evidence of significant vertical convection on Venus?
In heights where atmospheric temperatures are (significantly) influenced by the sun, there is strong horizontal convection (zonal circulation, transporting heat between the day and night sides of the planet). At lower than 50° latitudes, such east-west winds decrease from around 100 m/s at 60-70 km height to less the 1 m/s near surface.
Heat is also transported from the equator to the poles. However, near surface, such heat exchanges are not needed, as the temperature there does not depend on sun radiation, but on the iso-thermic heat from within the crust. (see
Also liquids and solid are "no insulation at all against radiation, except in the normal
" not-being-transparent "sense
To characterize a well-known normal physical principle by a trendy ideological concept such as greenhouse-effect
seems rather problematic to me.
That Venus may seem hotter than expected, results primarily from the fact that planets with atmospheres have no clearly defined surfaces.
A black body
with Venus' surface temperature (~740° Kelvin) radiates around 17,000 W/m2, whereas a black body with a temperature of Venus' upper cloud deck (~240° Kelvin) less than 200 W/m2.
If we defined the boundary between Jupiter's atmosphere and Jupiter's fluid interior as Jupiter's surface
, then we also could explain its high temperature by a super greenhouse effect
Ideology driven science is rather rule than exception