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Re: [school-discuss] a way for humans to control global warming without a behavior change ?
Or if we just let the trees grow they will take in the excess CO2 from
From: mike eschman <email@example.com>
To: School Forge <firstname.lastname@example.org>;
Date: Tuesday, September 03, 2002 10:36 AM
Subject: [school-discuss] a way for humans to control global warming
without a behavior change ?
Media Alerts Stories Archive --->
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
into the deep ocean is a good predictor of how effective that location
sequestering carbon away from the atmosphere.
Direct injection of CO2 into the deep ocean has been proposed as a way
the accumulation of carbon dioxide in the atmosphere, one of the
global warming. In the direct injection scenario, fossil-fuel carbon
is injected into the ocean interior, bypassing the mixing processes
would otherwise cause a relatively slow transfer of excess atmospheric
to the deep ocean.
In a study released today in Geophysical Research Letters, Ken
Philip Duffy of the Climate and Carbon Cycle Modeling Group and
Wickett of the Center for Applied Scientific Computing, all at
show that the depth, rather than radiocarbon, is a relatively good
of the effectiveness of CO2 injection.
The researchers studied both radiocarbon dating (typically used to
anthropologic items) and the depths of injection to determine the
effectiveness of direct CO2 injection as a carbon sequestration
Scientists used one-dimensional box-diffusion models and
simulations run under the radiocarbon and sequestration scenarios
in Livermore's Ocean Carbon-cycle Model Intercomparison Project
"These simulations indicate that the amount of time it takes for a
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
Injections were simulated at 800 meters, 1500 meters and 3000 meters
years near the Bay of Biscay, New York City, Rio de Janeiro, San
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,
into the Pacific Ocean (San Francisco and Tokyo) were more effective
injection at the same depth in the Atlantic Ocean (New York City, Rio
Janeiro and the Bay of Biscay).