Dr. Seitz et. al., I do expect that the complexity of predicting the response of *free swimming * photosynthetic organisms, propagated due to a large scale mariculture installations' passive cooling of the surface water, is such that their contribution to the overall maricultural operations' CO2 usage would/should be considered incidental until field trials can provide empirical data.
The use of space based assets will be highly useful in the initial field trials. The paper: Mapping size-speciļ¬c phytoplankton primary production on a global scale <http://journalofmaps.com/student/10_01_Brewin.pdf> has been my primary reference on the imaging side of this concept. Such imaging may also prove useful in selecting installation locations. You referenced Hardman Montford et al., should I seek out more recent works of his? Also, the architecture of large scale mariculture installations would be web like structures most likely based upon hexagonal sections. This large scale infrastructure would provide an excellent support/distribution means for the use of Bright Water (BW). The use of BW, in itself, will have a significant cooling effect on the surface water which will, in turn, affect the nutricline depth. This would be especially true if the compressed air was cooled/piped through deep water before release. This use of Ocean Thermal Conversion (OTC) for direct surface cooling through BW seems to be an efficient use of resources. Best, Michael On Saturday, November 2, 2013 9:38:13 AM UTC-7, Russell Seitz wrote: > > The response of free swimmng marine photosynthetic organisms to changes > in the light fiels are complicated , because most utilize upwelling and > scattered light as well as the direct rays of the sun in photosynthesis. > The modeling results Hardman-Montford et al report recall simulations run > at the ERES summer school two years ago. > > On Friday, November 1, 2013 12:28:17 PM UTC-4, andrewjlockley wrote: >> >> http://planetearth.nerc.ac.uk/news/story.aspx?id=1544&cookieConsent=A >> >> Link above is plain English. Abstract below >> >> Impacts of light shading and nutrient enrichment geo-engineering >> approaches on the productivity of a stratified, oligotrophic ocean >> ecosystem. >> >> Authors >> >> Hardman-Mountford NJ, et al. Show all >> >> Journal >> >> J R Soc Interface. 2013 Oct 16;10(89):20130701. doi: >> 10.1098/rsif.2013.0701. Print 2013. >> >> Affiliation >> >> Plymouth Marine Laboratory, , Prospect Place, Plymouth PL1 3DH, UK. >> >> Abstract >> >> Geo-engineering proposals to mitigate global warming have focused either >> on methods of carbon dioxide removal, particularly nutrient fertilization >> of plant growth, or on cooling the Earth's surface by reducing incoming >> solar radiation (shading). Marine phytoplankton contribute half the Earth's >> biological carbon fixation and carbon export in the ocean is modulated by >> the actions of microbes and grazing communities in recycling nutrients. >> Both nutrients and light are essential for photosynthesis, so understanding >> the relative influence of both these geo-engineering approaches on ocean >> ecosystem production and processes is critical to the evaluation of their >> effectiveness. In this paper, we investigate the relationship between light >> and nutrient availability on productivity in a stratified, oligotrophic >> subtropical ocean ecosystem using a one-dimensional water column model >> coupled to a multi-plankton ecosystem model, with the goal of elucidating >> potential impacts of these geo-engineering approaches on ecosystem >> production. We find that solar shading approaches can redistribute >> productivity in the water column but do not change total production. >> Macronutrient enrichment is able to enhance the export of carbon, although >> heterotrophic recycling reduces the efficiency of carbon export >> substantially over time. Our results highlight the requirement for a fuller >> consideration of marine ecosystem interactions and feedbacks, beyond simply >> the stimulation of surface blooms, in the evaluation of putative >> geo-engineering approaches. >> >> PMID >> >> 24132201 [PubMed - in process] >> > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/groups/opt_out.
