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Sound speed at 300-m depth in the North Pacific Ocean derived by various means
shown with the ATOC acoustic thermometry paths. The sound speeds estimates were derived
from: the NOAA World Ocean Atlas'05 (WOA'05), upper ocean temperature profiles produced by
an objective analysis (OA) procedure that combines satellite altimetric height with in situ
temperature profiles, the JPL-ECCO solution, and a high-resolution integration of the POP
model. The WOA05 field is the annual mean, the objective analysis is for winter 2003, and
the JPL-ECCO and POP estimates are for January 2003. The bottom panels show the differences
between the fields derived from the various estimates and the field derived from the annual
mean WOA05.
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