Ocean color data assimilation with material conservation for improving model estimates of air-sea CO<SUB>2</SUB> flux
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ID: 296788
2008
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Abstract
A nitrogen balancing scheme for ocean color data assimilation in general circulation models is
described and its potential for improving air-seaCO2 flux estimates is demonstrated. Given increments
for phytoplankton, obtainable from a univariate surface chlorophyll analysis, the scheme determines
mixed layer concentration increments for the other nitrogen pools: zooplankton, detritus and dissolved
inorganic nitrogen (DIN). The fraction of the phytoplankton increment to be balanced by changing
DIN varies dynamically with the likely contributions of phytoplankton growth and loss errors to the
error in the background state. Further increments are applied below the mixed layer wherever positive
DIN increments in shallower layers would otherwise cause the creation of unrealistic sub-surface
minima. Total nitrogen at each grid point is conserved where possible.
The scheme is evaluated by 1-D twin experiments for two contrasting locations in the North
Atlantic, in which synthetic chlorophyll observations are assimilated in an attempt to recover known
system trajectories generated by perturbing model parameters. Dissolved inorganic carbon (DIC)
and alkalinity tracers, controlled by the nitrogen dynamics, determine the biological modification of
sea-water pCO2 at the ocean surface. Assimilation affects DIC and alkalinity directly, the increments
being inferred from the nitrogen increments, as well as having a post-analysis effect via the dynamics.
It gives major improvements in surface pCO2 at 50N but less improvement at 30N where errors
in the phytoplankton nitrogen:chlorophyll ratio cause it to have a detrimental effect in summer.
Beneficial effects of nitrogen balancing are demonstrated by comparison with experiments in which
only phytoplankton and DIC are updated in the analysis.
| Reference Key |
openalex_W2002082431
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|---|---|
| Authors | John Hemmings, Rosa Barciela, Michael J. Bell |
| Journal | journal of marine research |
| Year | 2008 |
| DOI |
10.1357/002224008784815739
|
| URL | |
| Keywords | Keywords not found |
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