The engineering of a physically realistic profile for western Baffin Bay
We began by optimally interpolating just the data available to us. This "beta" PHC 2.1
field exhibited the problem discussed above: all of Baffin Bay was characterized by
the West Greenland current. We then chose a western Baffin Bay profile from this
beta field. One characteristic of this profile was a fairly shallow mixed layer
of about 75m, a West Greenland Current trait. Realistically, western Baffin Bay probably
has a deeper mixed layer in winter, so for our new profile, we extended the 75m value
down to 200m. Next, we obtained a summer profile from PHC 2.0 at the same location.
(Summer PHC 2.0 is well represented since there are plently of summer data, so we
trust these data.) We don't expect the difference between winter and summer data
to be too great at depth, so to finish off our profile, we used the summer profile
data beginning at 250m (which is the next depth level available in PHC 2.1 after
200m). Using a 200m mixed layer for our new profile gave the smoothest transition to the
summer data profile beginning at 250m, giving us confidence that our strategy was reasonable.
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