Re: [CDR] Real-time MRV for Ocean CDR: The Solubility Pump
Michael MacCracken
I'm a bit confused. The water pumped up is likely supersaturated in CO2, comes to the surface and warms as it spreads out, meaning it gives off CO2. Now, how does this water go back down, or is he saying that because this water is brought up, other water that is cold at high latitudes that has current pCO2 will sink. I'm not expert on this but I hope the calculation gets looked at pretty carefully.
Mike MacCracken
Hello everyone! Here’s a potential game-changer on MRV for Artificial Upwelling - data every hour. I look forward to your thoughts, ideas and observations.
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Chris Vivian
The OCS flyer makes a fundamental error in its initial assumption that upwelled water from 400m depth will have the same pCO2 as it had when that water was last at the surface in ~1750. This ignores the fact that during the centuries this water was beneath the surface mixed layer it was receiving a continual rain of decaying organic matter derived from the productivity of the surface mixed layer. This remineralisation of organic matter would have steady increased the pCO2 of the subsurface water over the centuries to the high levels indicated by Mike.
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Peter Flynn
Like Michael MacCracken, I have serious qualms about the concept. The argument that deep ocean water that equilibrated with an atmosphere at 270 ppm CO2 will be undersaturated when brought to the surface ignores the addition of carbon to deep water, including by the biological “snow”. All that I have read is that the deep ocean is supersaturated with CO2 relative to atmospheric pressure, hence will release CO2 if brought from the high pressure depths to shallow. One sometimes sees the argument that biological growth will take up more carbon than is released, but much productivity in the shallow ocean doesn’t leave the ocean, it simply is passed up the food chain. I think much more science is needed re the impact that releasing deep water into the shallow ocean will have on CO2.
Peter Flynn
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Mike Williamson
Sent: Tuesday, January 31, 2023 6:36 PM
To: Salvador Garcia <sga...@ocean-based.com>; Carbon Dioxide Removal <CarbonDiox...@googlegroups.com>
Subject: Re: [CDR] Real-time MRV for Ocean CDR: The Solubility Pump
Tom Goreau
Hard to know where this nonsense came from, but deep water is continually enriched in CO2 from decomposition of organic matter in deep waters and on the bottom, so when it is upwelled it is highly enriched in CO2 compared to surface waters, and so a SOURCE to the atmosphere.
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Albert Bates
Tom, I have also heard it said that "upwelling" is unlikely once you get deep enough. Something about the molecular weight of the carbon keeping it down. Apart from the biological carbon pump, is there any truth to this idea?