OCEANOGRAPHY

Figure 16 shows the SV, temperature and salinity profiles, the THETA-S diagram and location of the CTD casts. The physical water properties in the surveyed area were studied by $\Theta$-S diagram obtained with the CTD data collected during the cruise combined with samples in the same areas extracted from World Ocean Data 2001 [Conkright et al.(2002)].

CTD1 in the Paso Ancho shows the lower salinity values and mixed water column. CTD2 cast in the western passage presents a well developped halocline, due to higher run-off and fjord and channel morphology, other than a higher salinity water body from the Pacific. CTD4 in the Ocean is typical of West-drift current driven Chilean SAMW, with temperature range from $\sim$9°C to $\sim$2.4°C and lower salinity AAIW water above 1000m water depth.

The ThermoSalinometer data in the Ocean (Fig.17) show a large variation in the surface temperature distribution, with higher values toward the Strait and a well depicted frontal structure..

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Figure 16: Cruise SCPM04 CTD casts data. Lower left,right: Sound Velocity (gray), T (red,2-12°C), S (blue, 26-36 PSU). Upper left: TS diagram, including cast 239 of cruise 316N138/12,1993-02-24 in the Pacific Ocean, and casts of cruise 359, 1993-02/03 in the Straits, WOD 2001 (red hollow circle in position map).

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Figure 17: Cruise SCPM04 Thermosalinometer temperature data (-4.5m).