[ExI] Diminishing influence of increasing carbon dioxide on temperature
protokol2020 at gmail.com
Fri Aug 15 07:21:56 UTC 2014
Those winds are not nearly enough, to transfer the day heat to the night
side or to polar regions.
We have about the same high temperature everywhere on Venus all the time,
As we have about the same temperature everywhere here on Earth, but deep
down, Tanks to magma.
To transfer the Sun's heat in real time everywhere on the planet, one would
need a super-heat-conducter.
Venus "surface" is in fact deep down in the stuff. Sun has nearly nothing
to do with the temperature there, it's geothermic.
On Fri, Aug 15, 2014 at 2:16 AM, Anders Sandberg <anders at aleph.se> wrote:
> Tomaz Kristan <protokol2020 at gmail.com> , 14/8/2014 2:29 PM:
> My take on this.
> Measured wind speed profiles look like they have maxima around 60 km
> height, with 100 m/s velocities.
> Earth has a maximum around 10 km, with a maximum of a few tens of m/s.
> Venus scale height is 15.9 km, Earth's average 7.64 km. So the Venusian
> wind maximum is 3.77 scale heights up, while on Earth it is 1.3. At first
> that seems to suggest that there could not be much transfer since the
> atmosphere would be pretty attenuated. But remember the 92.1 bar pressure
> at the surface! exp(-3.77)*92.1=2.1 bar: at this altitude the atmosphere
> has twice Earth pressure, and it is significantly denser. So the total heat
> transfer capacity is several times, perhaps an order of magnitude, larger.
> The advection timescale (vind velocity / radius) of Earth and Venus are
> both of the same size, far shorter than the radiative timescales and hence
> producing a circulation-dominated temperature distribution:
> Anders Sandberg, Future of Humanity Institute Philosophy Faculty of Oxford
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