Die Expedition ANTARKTIS-VIII/1-2, 1989 mit der Winter Weddell Gyre Study der Forschungsschiffe "POLARSTERN" und "Akademik Fedorov"

• Main Authors: Augstein, E., Bagriantsev, N., Schenke, Hans-Werner
• Format: Book
• Language: unknown
• Published: 1991
• Subjects: Antarktis*; Polar Research; Reports on polar research
• Online Access: https://epic.awi.de/id/eprint/153/; https://hdl.handle.net/10013/epic.10744

The Polarstern-Expedition ANT VIII/ 1 was separated into twosections. During the first part from Bremerhaven to Vigo, Spain, thenew hydroacoustic sonar systems Hydrosweep and Parasound, whichwere installed in summer 1989, were calibrated in the North Seaand tested in the deep sea of the Bay of Biscay and at the Frenchcontinental shelf. During the second part of the cruise from Vigo toPuerto Madryn, Argentina, deep sea trials and special tests wereperformed at the Romanche Fracture Zone with both systemsHydrosweep and Parasound.During the entire cruise, various groups carried out air chemistryobservations in the Atlantic along the north-south profile. In additionozone observations in the lower atmosphere and water sampling inthe upper water column were performed systematically. Data fromradiosondes were collected continuously during the cruise and usedfor an improved modeling of the atmospheric correction of AVHRR-datafrom NOAA satellites. CTD-measurements were carried out inthe Hydrosweep test areas, and XBT's were launched regularly everyone degree of latitude.For the deep sea trials and comparisons with external data, Seabeammeasurements from the French R/V Jean Charcot and Hydrosweepdata from the German R/V Meteor were made available for thisproject by the originators of the data. For the determination of theinternal accuracy, repetitive measurements of selected profiles werecarried out.Another goal was the verification and analysis of the Hydrosweepcross-fan calibration technique used for the determination of themean sound speed value. For these investigations, special profileswere measured in the abyssal plain of the Bay of Biscay. The meanwater sound velocity, derived from Hydrosweep measurements, wascompared to the results from independent CTD-data in the samearea. The maximum observed difference was ± 5 m/s, which wouldcreate an error of about 3% of the water depth. The generalprecision for the mean sound velocity from a period of calibrations is± 1 m/s.The most important prerequisite for a precise sea ...