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Green World Trust
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Richard111
Experienced User
Joined: 19 Sep 2008
Posts: 433
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 Posted: 27 Oct 2009 07:52 am Post subject: |
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Jim:
I agree with what you are saying but this does not answer the question; are there any data for dissolved CO2 at from the ocean depths.
The carbonate mineral precipitate is new to me. Will look that up. Am aware of the calcium carbonate deposition from algea and stuff that ends up on the bottom. This eventually reaches the subduction zones and some portion of the CO2 can be returned to the atmosphere via volcanoes. (Ring of Fire, mostly undersea) The cycle time seems to be around 200,000,000 years. The apparent age of the basalt under the sea. It is interesting to note that the ice core records show atmospheric CO2 was in the order of 1,000ppm back then and even higher further back in the past.
I think there is more going on in the oceans than we realise. New data is seems to be presented almost daily. |
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Richard111
Experienced User
Joined: 19 Sep 2008
Posts: 433
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| Posted: 28 Oct 2009 06:38 am Post subject: |
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jimbo1490's comments led me to review calcium carbonate deposition on the sea bed and read Emily's home page: Emiliania huxleyi
| Quote: | | Phytoplankton: Emiliania huxleyi is one of 5000 or so different species of phytoplankton - freely drifting, photosynthesising microscopic organisms that live in the upper, sunlit layers of the ocean. Phytoplankton are the oceanic equivalents of terrestrial plants, forming the basis of virtually all marine food webs. The total phytoplankton biomass outweighs that of all the marine animals (zooplankton, fish, whales) put together, and phytoplankton productivity is one of the primary forces in regulating our planetary climate - for instance via impacts on atmospheric carbon dioxide levels which are tightly linked to the oceanic concentrations. |
Another link at the bottom of that page: Biogeochemical Impacts
Emily plays a big part in that 50:1 CO2 ratio between ocean and atmosphere, but she is not the only one. All this photosynthetic activity can only take place in the upper sunlit layers of the ocean.
What I am trying to find out now is what happends to the CO2 injected into the oceans from undersea volcanoes.
The only reports of bubbles arriving at the ocean surface that I have read refer to the release of methane from ocean floor clathrates.
James Lovelock aroused my interest in these beasties when he described their ability to release dimethyl sulphide gas which moves rapidly from water to the atmosphere and is a very effective cloud condensation nuclei. This tends to happen when the water temperature rises above their comfort level. They must "know" that increased temperature results in increased water vapour so they help clouds to form above and provide shade and maybe some cool rain. They are certainly more effective at controlling their climate than we are. |
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jimbo1490
Joined: 09 Apr 2009
Posts: 6
Location: Orlando
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| Posted: 29 Oct 2009 04:56 am Post subject: |
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| FerdiEgb wrote: |
Jij,
First of all, the mass balance makes it impossible that anything else than human emissions are responsible for the increase in the atmosphere:
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Can you cite a particular mass-balance study which confirms that all or nearly all of the ~100ppm CO2 rise observed over the last ~100 years is due to fossil fuel emissions, hence anthropogenic? The 'expected' mass balance if this were true would be would be about -11 per mil, corresponding to an atmospheric fossil CO2 content of ~21%. Also, most mass-balance studies seem to acknowledge the pre-industrial atmosphere's mass-balance was around -7.0 per mil.
Jim Rennison |
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perseus
Experienced User
Joined: 10 Aug 2010
Posts: 101
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| Posted: 10 Aug 2010 07:01 pm Post subject: |
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Nearly all the CO2 increase originates from fossil fuel. This is certain and unambiguous due to the ratio of carbon isotopes found in the atmospheric CO2. If rising atmospheric CO2 comes from fossil fuels, the C13/C12 should be falling. Indeed this is what is occurring.
About 40% of human CO2 emissions are being absorbed, mostly by vegetation and the oceans. The rest remains in the atmosphere. A natural change of 100ppm normally takes 5,000 to 20.000 years. The recent increase of 100ppm has taken just 120 years.
See http://www.skepticalscience.com/human-co2-smaller-than-natural-emissions.htm |
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