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- Newsgroups: sci.environment
- Path: sparky!uunet!think.com!ames!nsisrv!hyperion.gsfc.nasa.gov!hannegan
- From: hannegan@hyperion.gsfc.nasa.gov (Bryan Hannegan)
- Subject: Back of the envelope CO2 redux....
- Message-ID: <1992Nov19.182422.1115@nsisrv.gsfc.nasa.gov>
- Originator: hannegan@hyperion.gsfc.nasa.gov
- Sender: usenet@nsisrv.gsfc.nasa.gov (Usenet)
- Nntp-Posting-Host: hyperion.gsfc.nasa.gov
- Organization: Department of Geosciences, University of CA, Irvine
- Date: Thu, 19 Nov 1992 18:24:22 GMT
- Lines: 31
-
- In reference to my earlier post on this subject, I'd like to point out
- a couple of glaring errors on my part that SIGNIFICANTLY affect the result.
-
- 1) I had density as 1 kg/m3, actually it should be 10^3 kg/m3.
- 2) The volume of the ocean was 1.35 x 10^18 g, not 1.35 x 10^15 g.
-
- This would then increase the total by a factor of 10^6, making the result
- 1.52 x 10^11 metric tonnes, or 152 Gt.
-
- There are extreme problems with this, which I will point out so as to not
- leave stones unturned.
-
- 1) Temperature,pressure and density were considered constant at 298K, 1 atm,
- and 1 kg/m3 (figures for pure water at critical temperature)
- 2) Just the dissolving of CO2 gas was used, there were no chemical reactions
- taken into account (unlike in Harte, "Consider a Spherical Cow")
- 3) Based on net response, chemical uptake of CO2 represents more than 90% of
- the total CO2 content of the ocean, and we all know that assumption #1 is
- nowhere near reality (but it sure made calculations simple!)
-
- I had read that the yearly flux was on the order of Gt and I thought that was
- an usually large amountof flux for an element. Now I understand.
- Thanks for all the assitance and all the help. I hope this spawned some good
- thought.
-
- Bryan Hannegan
- halo.ps.uci.edu
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