Photos for that story can be found here: http://yacht-maiken.blogspot.com/2006/08/stone-sea-and-volcano.html
This one illustrate the albedo contrast [image: Inline image 1] On Wed, Aug 8, 2012 at 7:02 AM, Andrew Lockley <[email protected]>wrote: > Mike > > It occurs to me that there a few issues with this idea: > > Pumice is intermittently produced in the environment, so the presence > of a pumice layer on the ocean surface can be considered with a > source/reservoir/sink model. The sinks would seem to be dominant, as > there is no extant, visible layer. Pumice is less dense than water > purely because of gaseous inclusions in the rock. Over time, it would > appear reasonable that there is a loss of this gas by dissolution or > ebullition into the water column. Pumice would then join the general > marine snow, and should be detectable in the sediment layer. An > alternative model for the fate of pumice is mechanical destruction of > the particles by collision (wave action) or chemical dissolution of > the surrounding rock structure. As these processes progress, it is > likely that the albedo of the material would appreciably change, > potentially leading to a near neutral albedo effect. > > Furthermore, the radius of the pumice particles is likely non-optimal > for geoengineering use. The micron-sized particles proposed for SRM > have MT/yr fluxes. Larger particle sizes would require larger fluxes. > These substantial fluxes could negatively affect the marine > environment. > > Best, > > A > > On 8 August 2012 14:25, Mike MacCracken <[email protected]> wrote: > > Now here is an idea we have not considered—covering all or part of the > ocean > > in pumice. > > > > Mike MacCracken > > > > > > From: Robert Drew [mailto:[email protected]] > > Sent: Wednesday, August 08, 2012 6:31 AM > > To: Robert Drew > > Subject: FW: AMAZING SIGHT IN THE SOUTH PACIFIC > > > > You have to see this! From a sailing mate. > > > > > > > > > > > > AMAZING SIGHT IN THE SOUTH PACIFIC > > > > The yacht 'Maiken' was traveling in the south Pacific when the crew came > > across a weird sight. > > It was sand in the water, and the sand was floating ON TOP of the > waves... > > Look at these photos and try to imagine the feeling, the thrill of > > experiencing this phenomenon close-up. > > > > > > > > > > > > > > This is not a beach, it is volcanic stones floating on the water! > > > > > > > > > > > > > > > > > > > > The trail left by the yacht... through the sand > > And then this was spotted... just behind them... ash and steam rising > from > > the ocean... > > > > > > And, while they were watching... > > > > > > > > > > A plume of black ash... > > > > > > > > > > > > > > > > > > > > > > > > > > A brand new island formed... > > > > > > > > > > > > > > Awesome! > > Can you imagine the thrill of being the first & only people to see a new > > island being created... where there was nothing before? > > > > Then, can you imagine thinking -- > > "Gee if I been a few minutes later, I might have gone up in that > explosion > > of > > black volcanic ash when the eruption occurred" > > > > -- Now there's a scary thought!!! > > > > > > > > > > -- > > You received this message because you are subscribed to the Google Groups > > "geoengineering" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visit this group at > > http://groups.google.com/group/geoengineering?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/geoengineering?hl=en. > > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
