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Re: [school-discuss] a way for humans to control global warming without a behavior change ?
what do you teach ?
mike eschman, etc ...
On Tuesday 03 September 2002 10:47 am, Cameron Miller wrote:
> Maybe this stuff can be better directed to some of the 28,000 sites
> listed here:
> - cameron
> mike eschman wrote:
> > Media Alerts Stories Archive --->
> > http://earthobservatory.nasa.gov/Newsroom/MediaAlerts/2002/2002082010367.
> > August 20, 2002
> > LIVERMORE RESEARCHERS SHOW DEPTH OF INJECTED CO2 INTO THE OCEAN CRITICAL
> > AS A GLOBAL WARMING SOLUTION
> > LIVERMORE, Calif. ? Researchers from the Lawrence Livermore National
> > Laboratory have determined that the depth of an injection of carbon
> > dioxide into the deep ocean is a good predictor of how effective that
> > location is at sequestering carbon away from the atmosphere.
> > Direct injection of CO2 into the deep ocean has been proposed as a way to
> > slow the accumulation of carbon dioxide in the atmosphere, one of the
> > causes of global warming. In the direct injection scenario, fossil-fuel
> > carbon dioxide is injected into the ocean interior, bypassing the mixing
> > processes that would otherwise cause a relatively slow transfer of excess
> > atmospheric CO2 in to the deep ocean.
> > In a study released today in Geophysical Research Letters, Ken Caldeira
> > and Philip Duffy of the Climate and Carbon Cycle Modeling Group and
> > Michael Wickett of the Center for Applied Scientific Computing, all at
> > Livermore, show that the depth, rather than radiocarbon, is a relatively
> > good predictor of the effectiveness of CO2 injection.
> > The researchers studied both radiocarbon dating (typically used to date
> > anthropologic items) and the depths of injection to determine the
> > effectiveness of direct CO2 injection as a carbon sequestration strategy.
> > Scientists used one-dimensional box-diffusion models and
> > three-dimensional simulations run under the radiocarbon and sequestration
> > scenarios described in Livermore's Ocean Carbon-cycle Model
> > Intercomparison Project protocols.
> > "These simulations indicate that the amount of time it takes for a water
> > parcel to return to the ocean surface increases with depth, but is not
> > related to the amount of time since that parcel was last at the surface,"
> > Duffy said.
> > Injections were simulated at 800 meters, 1500 meters and 3000 meters for
> > 100 years near the Bay of Biscay, New York City, Rio de Janeiro, San
> > Francisco, Tokyo, Jakarta and Bombay.
> > The models showed that injection at 3000 meters is quite effective at
> > sequestering carbon from the atmosphere for several centuries while
> > injections at shallower depths are less effective. In general, injections
> > into the Pacific Ocean (San Francisco and Tokyo) were more effective than
> > injection at the same depth in the Atlantic Ocean (New York City, Rio de
> > Janeiro and the Bay of Biscay).