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Monday, February 9, 2009

Vacationing on Venus Basic Geology Series Part 1

Guest post by Steven Goddard

venus surface

Magellan radar imaged Venus - NASA Image

In some ways, Venus is similar to earth. It is about the same size as the earth, has a nickel-iron core, and has volcanic activity due to radioactive heating in the interior. But that is where the similarities end. Venus has some serious problems as a vacation spot - mainly that it is extremely hot and the atmosphere is a thick cloud of sulfuric acid, CO2 and other unpleasant chemicals.
So how did Venus get to be like that, and why is the earth different?

  1. Venus is closer to the sun, which makes it hotter and prevents formation of oceans due to excessive evaporation.
  2. Venus suffered a traumatic collision in it’s early days, which causes it to rotate very slowly and parallel to the ecliptic. This makes for long afternoons (thousands of hours long) which get extremely hot.
  3. Because of 1 and 2, Venus was never able to sequester CO2 in limestones like the earth.

For the last few billion years, volcanoes on earth have been spewing out the greenhouse gases H2O, CO2 and CH4, as well as, H2SO4, SO2, H2S, HCl and Cl2. If not for the oceans and limestone sequestration, we would have a very thick, hot acidic atmosphere like Venus which could not support life. Fortunately, temperatures and other conditions on earth were just right to allow huge volumes of CO2 to move into the oceans and precipitate carbonate rock layers, where the CO2 became sequestered. This makes earth the pleasant place which we all enjoy.
Wikipedia image - carbonate rocks in Italy, uplifted miles above sea level.

One of the oft stated concerns by the IPCC and others is excess CO2 from cement production, which involves heating carbonate rocks and has the side effect of returning CO2 to the atmosphere. Dr. Hansen and others have also suggested that periods of rapid warming in the past have been due to limestone formations being subducted into hot volcanic regions and losing their CO2 to the atmosphere.

But make no mistake, without the CO2 sequestered in limestone and other carbonate rocks, earth would be hot, toxic and probably unlivable - like Venus.

Some more detailed discussion here and here .
Part 2 will be a discussion of how fossil fuels fit into the picture.

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