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- Path: sparky!uunet!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!seismo!skadi!stead
- From: stead@skadi.CSS.GOV (Richard Stead)
- Newsgroups: sci.geo.geology
- Subject: Re: rising sea level & ocean volcanos
- Message-ID: <51539@seismo.CSS.GOV>
- Date: 23 Nov 92 22:08:55 GMT
- References: <97619@netnews.upenn.edu> <1e734kINN5vh@crcnis1.unl.edu> <1992Nov20.200300.2452@merrimack.edu>
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- In article <1992Nov20.200300.2452@merrimack.edu>, nin15b63@merrimack.edu (THE WOLF) writes:
- > I've heard it postulated that the volcanos at the bottom of the ocean are
- > erupting more, just as those on our surface have been. These eruptions are
- > warming the oceans, which are warming the surface/atmosphere. It might follow
- > that the warmth would also raise sea level.
-
- Global warming (most likely due to increased CO2 in the atmosphere is warming
- the oceans, and they are expanding (rising) a bit from this, but it is very
- small. Volcanoes are not erupting more frequently. They are merely reported
- more frequently.
-
- > Is it conceivable, if this idea were valid, that there would be enough spewing
- > of this volcanos to slightly raise sea level still more?
-
- No. The volume of the oceans is about 1.37 billion km^3. A typical eruption
- spews maybe 1-10 km^3 of ash and lava, clearly a drop in the bucket.
-
- > Also, what would folks expect the overall effect of warming a portion of the
- > ocean which is normally cold to be? Add in the idea that the volcanos erupting
- > on the surface should be creating cooler air. Now consider a train headed at 50
-
- The air will cool from SO2 in the atmosphere reflecting solar radiation,
- but it will be removed from the atmosphere within a couple years and it takes
- a very powerful eruption to get enough up there in the first place.
- And you have to compete with the greenhouse effect.
-
- The main effect of warmer oceans is to melt polar ice. ocean current might
- change as well.
-
-
- --
- Richard Stead
- Center for Seismic Studies
- Arlington, VA
- stead@seismo.css.gov
-