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( O
OA B-climate-hazards
) O
, O
which O
will O
impact O
upon O
key O
biogeochemical B-climate-nature
processes O
in O
the O
ocean B-climate-nature
such O
as O
net B-climate-properties
primary I-climate-properties
production I-climate-properties
( O
NPP B-climate-properties
) O
, O
carbon B-climate-properties
export I-climate-properties
( O
CEX B-climate-properties
) O
, O
N2 B-climate-properties
fixation I-climate-properties
( O
NFIX B-climate-properties
) O
, O
denitrification B-climate-properties
( O
DENIT B-climate-properties
) O
, O
and O
ocean B-climate-nature
suboxia I-climate-nature
( O
SOX B-climate-nature
) O
. O
However O
, O
appraising O
the O
impact O
of O
OA O
on O
marine B-climate-nature
biogeochemical B-climate-nature
cycles I-climate-nature
requires O
ocean O
general O
circulation O
and O
biogeochemistry O
models O
( O
OGCBMs O
) O
that O
necessitate O
a O
number O
of O
assumptions O
regarding O
the O
response O
of O
phytoplankton B-climate-organisms
physiological O
processes O
to O
OA O
. O
Of O
particular O
importance O
are O
changes O
in O
C B-climate-nature
: I-climate-nature
N I-climate-nature
:P I-climate-nature
stoichiometry I-climate-nature
, O
which O
can O