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�ꡡ�ܡ�Direct observations of sea-ice thickness and brine rejection off Sakhalin in the Sea of Okhotsk

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A high-resolution/three-dimensional ocean circulation model in the 
Sea of Okhotsk has been developed as a step toward the simulation of 
oil spills. The model reproducibility is first examined in detail. 
Comparison with surface drifter, mooring, and HF ocean radar data 
shows that the model successfully reproduces the realistic flow 
fields, which include the vertical structure and seasonal variation 
of the East Sakhalin Current and Soya Warm Current. Thus the particle 
tracking experiments in these regions are considered to provide 
reliable results. The results of particle tracking experiments on 
the drift/diffusion of water from Amur River and northwestern shelf 
will be shown during the presentation. Also, the formation mechanism 
of the cold water belt off the Soya Warm Current will be discussed.

Direct observations of sea-ice thickness and brine rejection off Sakhalin in the Sea of Okhotsk-(��Į ��) ȯɽ�׻� :

From December to June 2002-03, sea-ice and oceanic data were obtained
from moorings near Sakhalin in west central Okhotsk Sea. Ice draft
measured by sonar reveals distinct periods of thin and thick ice.
Thin-ice periods in January-March corresponded to offshore ice movement
and increasing seawater salinity.  Dense shelf water was observed suggesting
that this region is another possible source.  The measured salinity corresponds
well with that derived from via heat-flux calculations.  Brine rejection from ice
growing in the coastal polynya is responsible for much of the observed
salinity increase.  The periods of thick-ice incursion are likely
indicative of heavily deformed pack formed further north and drifting
south with the current.  The mean draft (1.95 m) and keel frequency are
close to values observed in the lower Arctic.  Freshwater transport
estimated from the observed ice thickness and velocity is larger than
that of the Amur river discharge.

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