Please enable JavaScript.
Coggle requires JavaScript to display documents.
Arguments against the aOIF - Coggle Diagram
Arguments against the aOIF
Affects the
cycle of elements
carbon
cycle
lack of proff that C is exported to the deep sea after aOIF
circulation of
nutrients
phosphate
export to great depths
much of the initial drawdown of atmospheric CO2 takes place not at the fertilization site, but in the
surrounding area
Metodology objectives
aOIF is
not fully understood
process
aOIF is only
short-term
experiments now - i’s not confirmed whether it successfully be scaled up
temporally
and
spatially
continous aOIF doesn’t mimic the natural phenomena like episodic
dust events
or
upwelling
Fertilization is
not fully under our control (
it's liquid medium)
Fe in aOIF is
chemically different
than atmospheric iron sourcesc due to artificial chelators
It is hard to determinate the right amound of added iron
The initial environment can afffect the outcome of an aOIF experiments (
some results may not be reliabe
)
aOIF experiments need a
chemical tracer
- it's nontoxic, but
we don't know how some organism respond to it
Changes of the
ocean's ecology
Influcence
phytoplankton community
structure
changes in silicate:nitrate uptake stoichiometry
increasing phytoplankton biomass and composition may alter the whole
trophic net functioning
reduction in export production
(export production increases during fertilization and then drops in succeeding years)
reduces biological productivity
in the long term
changes in production do not occur at the fertilization site but on
larger spatial scales
side effects
include the production of greenhouse gases (e.g., nitrous oxide and methane), the development of hypoxia/anoxia in the water column and toxic algal blooms