The diffusive component of the vertical flux of particulate organic carbon (POC)
from the surface ocean layer has been estimated using a combination of the mixed
layer model and ocean color data from the SeaWiFS satellite. The calculations
were carried out for an example location in the north polar Atlantic centered
at 75◦N and 0◦ E for the time period of 1998–2004. The satellite estimates of
surface POC derived using a regional ocean color algorithm were applied as an
input to the model driven by local surface heat and momentum fluxes. For each
year of the examined period, the diffusive POC flux was estimated at 200-m depth
from April through December. The highest flux is generally observed in the late
fall as a result of increased heat loss and convectional mixing of surface waters.
A relatively high diffusive POC flux is also observed in early spring, when surface
waters are weakly stratified. In addition, the model results demonstrate significant
interannual variability. The highest diffusive POC flux occurred in 1999 (about
4500 mg m−2 over the 9-month period). In 1998 and 2002 the estimated flux was
about two orders of magnitude lower. The interannual variability of the diffusive
POC flux is associated with mixed layer dynamics and underscores the importance
of atmospheric forcing for POC export from the surface layer to the ocean’s interior.
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