Variaciones interanuales (1995-2000) de la temperatura y la salinidad registradas en los meses de enero en el golfo San Jorge y aguas adyacentes (43°S-47°S).
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Temperature and salinity interannual variations are analyzed south ofthe hake (Merluccius hubbsi)spawning grounds area, in the San Jorge Gulf and adjacent waters Argentine Sea, SW Atlantic. The study period comprises the months of January 1995-2000. Results of cruises carried out on board of INIDEP research vessels to assess hake juveniles were studied. Statistically significant increase of temperature from 1997 was observed. Change trends over a period of 20 years at a global climate scale are discussed. Mean salinity did not show variations except for 2000 when it was slightly higher probably due to the scarce influence of the Patagonian Current in the area. Temperature and salinity fields showed a horizontal gradient south of the Gulf (thermohaline front)while in the mouth a thermal gradient, more marked at the bottom than on the surface (coastal tidal front)was observed. The presence of a thermocline between 30 m and 50 m depth is described. Statistically, surface and bottom temperatures were equivalent to those of surface and bottom layers.