Experiment name: AWI Antarctic moorings Principal Investigator: E.Fahrbach Affiliation: Alfred Wegener Inst. Mooring name: FR-1 Mooring position: 75.027 deg S, 31.728 deg W Instrument depth: 378 meters Seafloor depth: 617 meters Times: 2000 03 Feb 1995 to 0800 12 May 1997 Time increment: 120 minutes Instrument type: Aanderaa RCM parameter min mean max stddev days speed (cm/sec) 1.49 10.22 42.45 5.67 828.58 dir (deg true) 0.00 216.30 359.86 124.68 828.58 u (cm/sec) -37.36 -2.99 25.52 6.78 828.58 v (cm/sec) -24.06 5.24 39.49 7.36 828.58 temp (deg C) -2.23 -1.99 0.35 0.09 828.58 salinity (psu) 34.01 34.58 34.77 0.12 828.58 This instrument's pressure sensor drifted to lower pressures during the deployment, from about 380 db initially to about 100 db when the mooring was recovered, a 280 db change. This difference can be explained as mooring line stretch, or as movement of the mooring (for example a strong current dragging the mooring uphill), or as a sensor malfunction. Something similar occured on the instrument above this one, where initial pressure readings had decreased by about 175 db by the end of the experiment. Comparing, we can rule out line stretch or mooring movement, so we conclude that both pressure sensors failed. As a result we have removed pressure from both files. Note that salinity, which is calculated from conductivity, temperature, and pressure may have been affected by the bad pressure values. We do not know whether the effect is large or small, so we have allowed salinity to remain in the file. Use the salinity values with caution.
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