Desarrollo de la Antártica

EL DESARROLLO DE LA ANTÁRTICA field determined frOID the data provided a hase to be used in inter– preting tihe temperature and velodty data obtained from the moo– rings_ Argentine Winter C71wise During the 76 austral winter, scientists from the Argentine Antarctic Institute directed a physical oceanography cruise aboard the ARA ISLAS OReADAS in the Drake Passage. Ice (over extending northward to ap– proximately 60 0 S precluded the possibility of a full hydrographic section across the passage. Therefore, a north-south section of deep hydrographic/sTD observations was made· extending across the ice– free lOne. In addition, 1500 m stations were made in a zig-zag pattern to define the transition between tlhe Polar Frontal Zone and the An– tarctic Surface Waters. Within the Polar Frontal Zone, at one station, STD'S were taken hourly for 24 hours. Surface ana meteorological ob. servations were taken at each station. XBT Program During the 1976-71 austral summer ít was ¡planned to take 29 north– south and one east-west XBT (expe:ldable bathythermograph) sections at 18 n. mile intervals from supply vessels. Results have been obtai– ned from the east-west section and at lcast 21 of the north-south sec– tions. Ships involved were supplying land stations for Australia, Chi– le, and the U. S. AH but one of tlle vessels obtained surface salinity and wind at each XBT cast. The data obtained will be digitized and used to describe the 1976-77 summer spatial variability of temperatu– res in the Southern Ocean. rrhe pr.i:1ópal investigator for the project is Dr. William IEmery (Texas AAM University). Mr. HelImuth Sie– vers (Instituto Hidrográfico de la .Armada, Chile). Mr. Robert Ed– wards (<:SIRO, Australia) and Mr. Stan Jacobs (Lamont-Do:herty Gro– logical Observatory. USA) cooperated in the project. 1977 ZUBOV C11uise The USSR research vessel PROFJ?SSOR I7lUBOV sailed on 20 ]anuary 1977 from Wellington, New Zealand, on a 25-day USSR-USA cooperative cruise in the Soutihern Ocean south of Australia. Originally the cruise was planned to deploy three short-term (six to eight weeks) current meter moorings and to take 30 hydrographic stations along 132°E.